[Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test

Juan Quintela posted 6 patches 8 years, 2 months ago
There is a newer version of this series
[Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test
Posted by Juan Quintela 8 years, 2 months ago
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 tests/migration-test.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/tests/migration-test.c b/tests/migration-test.c
index 841c89e28a..41dee78a9a 100644
--- a/tests/migration-test.c
+++ b/tests/migration-test.c
@@ -410,6 +410,20 @@ static void deprecated_set_speed(QTestState *who, const char *value)
     migrate_check_parameter(who, "max-bandwidth", value);
 }
 
+static void deprecated_set_cache_size(QTestState *who, const char *value)
+{
+    QDict *rsp;
+    gchar *cmd;
+
+    cmd = g_strdup_printf("{ 'execute': 'migrate-set-cache-size',"
+                          "'arguments': { 'value': %s } }", value);
+    rsp = qtest_qmp(who, cmd);
+    g_free(cmd);
+    g_assert(qdict_haskey(rsp, "return"));
+    QDECREF(rsp);
+    migrate_check_parameter(who, "xbzrle-cache-size", value);
+}
+
 static void migrate_set_parameter(QTestState *who, const char *parameter,
                                   const char *value)
 {
@@ -424,6 +438,10 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
         deprecated_set_speed(who, "12345");
     }
 
+    if (strcmp(parameter, "xbzrle-cache-size") == 0) {
+        deprecated_set_cache_size(who, "4096");
+    }
+
     cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
                           "'arguments': { '%s': %s } }",
                           parameter, value);
@@ -673,6 +691,55 @@ static void test_precopy_tcp(void)
     g_free(port);
 }
 
+static void test_xbzrle(const char *uri)
+{
+    QTestState *from, *to;
+
+    test_migrate_start(&from, &to, uri);
+
+    /* We want to pick a speed slow enough that the test completes
+     * quickly, but that it doesn't complete precopy even on a slow
+     * machine, so also set the downtime.
+     */
+    /* 100 ms */
+    migrate_set_parameter(from, "downtime-limit", "1");
+    /* 1MB/s slow*/
+    migrate_set_parameter(from, "max-bandwidth", "1000000000");
+
+    migrate_set_parameter(from, "xbzrle-cache-size", "33554432");
+
+    migrate_set_capability(from, "xbzrle", "true");
+    migrate_set_capability(to, "xbzrle", "true");
+    /* Wait for the first serial output from the source */
+    wait_for_serial("src_serial");
+
+    migrate(from, uri);
+
+    wait_for_migration_pass(from);
+
+    /* 300ms it should converge */
+    migrate_set_parameter(from, "downtime-limit", "300");
+
+    if (!got_stop) {
+        qtest_qmp_eventwait(from, "STOP");
+    }
+    qtest_qmp_eventwait(to, "RESUME");
+
+    wait_for_serial("dest_serial");
+    wait_for_migration_complete(from);
+
+    test_migrate_end(from, to);
+}
+
+static void test_xbzrle_unix(void)
+{
+    char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
+
+    test_xbzrle(uri);
+    g_free(uri);
+}
+
+
 int main(int argc, char **argv)
 {
     char template[] = "/tmp/migration-test-XXXXXX";
@@ -695,6 +762,7 @@ int main(int argc, char **argv)
     qtest_add_func("/migration/precopy/unix", test_precopy_unix);
     qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
     qtest_add_func("/migration/postcopy/unix", test_postcopy);
+    qtest_add_func("/migration/xbzrle/unix", test_xbzrle_unix);
 
     ret = g_test_run();
 
-- 
2.14.3


Re: [Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test
Posted by Dr. David Alan Gilbert 8 years, 2 months ago
* Juan Quintela (quintela@redhat.com) wrote:
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> ---
>  tests/migration-test.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 68 insertions(+)
> 
> diff --git a/tests/migration-test.c b/tests/migration-test.c
> index 841c89e28a..41dee78a9a 100644
> --- a/tests/migration-test.c
> +++ b/tests/migration-test.c
> @@ -410,6 +410,20 @@ static void deprecated_set_speed(QTestState *who, const char *value)
>      migrate_check_parameter(who, "max-bandwidth", value);
>  }
>  
> +static void deprecated_set_cache_size(QTestState *who, const char *value)
> +{
> +    QDict *rsp;
> +    gchar *cmd;
> +
> +    cmd = g_strdup_printf("{ 'execute': 'migrate-set-cache-size',"
> +                          "'arguments': { 'value': %s } }", value);
> +    rsp = qtest_qmp(who, cmd);
> +    g_free(cmd);
> +    g_assert(qdict_haskey(rsp, "return"));
> +    QDECREF(rsp);
> +    migrate_check_parameter(who, "xbzrle-cache-size", value);
> +}
> +
>  static void migrate_set_parameter(QTestState *who, const char *parameter,
>                                    const char *value)
>  {
> @@ -424,6 +438,10 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
>          deprecated_set_speed(who, "12345");
>      }
>  
> +    if (strcmp(parameter, "xbzrle-cache-size") == 0) {
> +        deprecated_set_cache_size(who, "4096");
> +    }
> +
>      cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
>                            "'arguments': { '%s': %s } }",
>                            parameter, value);
> @@ -673,6 +691,55 @@ static void test_precopy_tcp(void)
>      g_free(port);
>  }
>  
> +static void test_xbzrle(const char *uri)
> +{
> +    QTestState *from, *to;
> +
> +    test_migrate_start(&from, &to, uri);
> +
> +    /* We want to pick a speed slow enough that the test completes
> +     * quickly, but that it doesn't complete precopy even on a slow
> +     * machine, so also set the downtime.
> +     */
> +    /* 100 ms */
> +    migrate_set_parameter(from, "downtime-limit", "1");

? That's 1 ms not 100ms as the comment says?

> +    /* 1MB/s slow*/
> +    migrate_set_parameter(from, "max-bandwidth", "1000000000");

That's still 1GB/s isn't it?
Don't you need to reduce that if xbzrle is actually working otherwise
it'll complete?

> +    migrate_set_parameter(from, "xbzrle-cache-size", "33554432");

That's 32M - why?
The test continually rewrites 100M of data; only changing one byte/page
- so actually the fun way to do the xbzrle test is to leave this as 32M
here.....

> +    migrate_set_capability(from, "xbzrle", "true");
> +    migrate_set_capability(to, "xbzrle", "true");
> +    /* Wait for the first serial output from the source */
> +    wait_for_serial("src_serial");
> +
> +    migrate(from, uri);
> +
> +    wait_for_migration_pass(from);
> +
> +    /* 300ms it should converge */
> +    migrate_set_parameter(from, "downtime-limit", "300");

but first increase the xvzrle cache to 120M and give it a couple of
seconds delay; you might even find it completes without the downtime
limit schange; but you should still do that after a few seconds.
You can check the stats as well, you should get some xbzrle cache hits
as long as you raised the cache size.

Dave

> +    if (!got_stop) {
> +        qtest_qmp_eventwait(from, "STOP");
> +    }
> +    qtest_qmp_eventwait(to, "RESUME");
> +
> +    wait_for_serial("dest_serial");
> +    wait_for_migration_complete(from);
> +
> +    test_migrate_end(from, to);
> +}
> +
> +static void test_xbzrle_unix(void)
> +{
> +    char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
> +
> +    test_xbzrle(uri);
> +    g_free(uri);
> +}
> +
> +
>  int main(int argc, char **argv)
>  {
>      char template[] = "/tmp/migration-test-XXXXXX";
> @@ -695,6 +762,7 @@ int main(int argc, char **argv)
>      qtest_add_func("/migration/precopy/unix", test_precopy_unix);
>      qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
>      qtest_add_func("/migration/postcopy/unix", test_postcopy);
> +    qtest_add_func("/migration/xbzrle/unix", test_xbzrle_unix);
>  
>      ret = g_test_run();
>  
> -- 
> 2.14.3
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

Re: [Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test
Posted by Juan Quintela 8 years, 1 month ago
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
> * Juan Quintela (quintela@redhat.com) wrote:
>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> ---
>>  tests/migration-test.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 68 insertions(+)
>> 
>> diff --git a/tests/migration-test.c b/tests/migration-test.c
>> index 841c89e28a..41dee78a9a 100644
>> --- a/tests/migration-test.c
>> +++ b/tests/migration-test.c
>> @@ -410,6 +410,20 @@ static void deprecated_set_speed(QTestState *who, const char *value)
>>      migrate_check_parameter(who, "max-bandwidth", value);
>>  }
>>  
>> +static void deprecated_set_cache_size(QTestState *who, const char *value)
>> +{
>> +    QDict *rsp;
>> +    gchar *cmd;
>> +
>> +    cmd = g_strdup_printf("{ 'execute': 'migrate-set-cache-size',"
>> +                          "'arguments': { 'value': %s } }", value);
>> +    rsp = qtest_qmp(who, cmd);
>> +    g_free(cmd);
>> +    g_assert(qdict_haskey(rsp, "return"));
>> +    QDECREF(rsp);
>> +    migrate_check_parameter(who, "xbzrle-cache-size", value);
>> +}
>> +
>>  static void migrate_set_parameter(QTestState *who, const char *parameter,
>>                                    const char *value)
>>  {
>> @@ -424,6 +438,10 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
>>          deprecated_set_speed(who, "12345");
>>      }
>>  
>> +    if (strcmp(parameter, "xbzrle-cache-size") == 0) {
>> +        deprecated_set_cache_size(who, "4096");
>> +    }
>> +
>>      cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
>>                            "'arguments': { '%s': %s } }",
>>                            parameter, value);
>> @@ -673,6 +691,55 @@ static void test_precopy_tcp(void)
>>      g_free(port);
>>  }
>>  
>> +static void test_xbzrle(const char *uri)
>> +{
>> +    QTestState *from, *to;
>> +
>> +    test_migrate_start(&from, &to, uri);
>> +
>> +    /* We want to pick a speed slow enough that the test completes
>> +     * quickly, but that it doesn't complete precopy even on a slow
>> +     * machine, so also set the downtime.
>> +     */
>> +    /* 100 ms */
>> +    migrate_set_parameter(from, "downtime-limit", "1");
>
> ? That's 1 ms not 100ms as the comment says?

You are right, fixed all the comments and forget this one.
Fixed.

>> +    /* 1MB/s slow*/
>> +    migrate_set_parameter(from, "max-bandwidth", "1000000000");
>
> That's still 1GB/s isn't it?
> Don't you need to reduce that if xbzrle is actually working otherwise
> it'll complete?

I was doing it differently before:

300ms downtime
1MB/s

But this was not reliable to make me wait for it.

So, I changed it to be:

1GB/s (always full speed)
1ms downtime  (so it never converge)

and I change the downtime to something higher later.


>
>> +    migrate_set_parameter(from, "xbzrle-cache-size", "33554432");
>
> That's 32M - why?

It is a value smaller than the full amount of memory.  I want to test
the xbzrle cache size command.  I don't care about *which* value we are
using, really.

> The test continually rewrites 100M of data; only changing one byte/page
> - so actually the fun way to do the xbzrle test is to leave this as 32M
> here.....

>> +    migrate_set_capability(from, "xbzrle", "true");
>> +    migrate_set_capability(to, "xbzrle", "true");
>> +    /* Wait for the first serial output from the source */
>> +    wait_for_serial("src_serial");
>> +
>> +    migrate(from, uri);
>> +
>> +    wait_for_migration_pass(from);
>> +
>> +    /* 300ms it should converge */
>> +    migrate_set_parameter(from, "downtime-limit", "300");
>
> but first increase the xvzrle cache to 120M and give it a couple of
> seconds delay; you might even find it completes without the downtime
> limit schange; but you should still do that after a few seconds.
> You can check the stats as well, you should get some xbzrle cache hits
> as long as you raised the cache size.

ok, will think something more about this.

Thanks, Juan.


> Dave
>
>> +    if (!got_stop) {
>> +        qtest_qmp_eventwait(from, "STOP");
>> +    }
>> +    qtest_qmp_eventwait(to, "RESUME");
>> +
>> +    wait_for_serial("dest_serial");
>> +    wait_for_migration_complete(from);
>> +
>> +    test_migrate_end(from, to);
>> +}
>> +
>> +static void test_xbzrle_unix(void)
>> +{
>> +    char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
>> +
>> +    test_xbzrle(uri);
>> +    g_free(uri);
>> +}
>> +
>> +
>>  int main(int argc, char **argv)
>>  {
>>      char template[] = "/tmp/migration-test-XXXXXX";
>> @@ -695,6 +762,7 @@ int main(int argc, char **argv)
>>      qtest_add_func("/migration/precopy/unix", test_precopy_unix);
>>      qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
>>      qtest_add_func("/migration/postcopy/unix", test_postcopy);
>> +    qtest_add_func("/migration/xbzrle/unix", test_xbzrle_unix);
>>  
>>      ret = g_test_run();
>>  
>> -- 
>> 2.14.3
>> 
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

Re: [Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test
Posted by Juan Quintela 8 years, 1 month ago
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
> * Juan Quintela (quintela@redhat.com) wrote:
>> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> ---
>>  tests/migration-test.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 68 insertions(+)
>> 
>> diff --git a/tests/migration-test.c b/tests/migration-test.c
>> index 841c89e28a..41dee78a9a 100644
>> --- a/tests/migration-test.c
>> +++ b/tests/migration-test.c
>> @@ -410,6 +410,20 @@ static void deprecated_set_speed(QTestState *who, const char *value)
>>      migrate_check_parameter(who, "max-bandwidth", value);
>>  }
>>  
>> +static void deprecated_set_cache_size(QTestState *who, const char *value)
>> +{
>> +    QDict *rsp;
>> +    gchar *cmd;
>> +
>> +    cmd = g_strdup_printf("{ 'execute': 'migrate-set-cache-size',"
>> +                          "'arguments': { 'value': %s } }", value);
>> +    rsp = qtest_qmp(who, cmd);
>> +    g_free(cmd);
>> +    g_assert(qdict_haskey(rsp, "return"));
>> +    QDECREF(rsp);
>> +    migrate_check_parameter(who, "xbzrle-cache-size", value);
>> +}
>> +
>>  static void migrate_set_parameter(QTestState *who, const char *parameter,
>>                                    const char *value)
>>  {
>> @@ -424,6 +438,10 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
>>          deprecated_set_speed(who, "12345");
>>      }
>>  
>> +    if (strcmp(parameter, "xbzrle-cache-size") == 0) {
>> +        deprecated_set_cache_size(who, "4096");
>> +    }
>> +
>>      cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
>>                            "'arguments': { '%s': %s } }",
>>                            parameter, value);
>> @@ -673,6 +691,55 @@ static void test_precopy_tcp(void)
>>      g_free(port);
>>  }
>>  
>> +static void test_xbzrle(const char *uri)
>> +{
>> +    QTestState *from, *to;
>> +
>> +    test_migrate_start(&from, &to, uri);
>> +
>> +    /* We want to pick a speed slow enough that the test completes
>> +     * quickly, but that it doesn't complete precopy even on a slow
>> +     * machine, so also set the downtime.
>> +     */
>> +    /* 100 ms */
>> +    migrate_set_parameter(from, "downtime-limit", "1");
>
> ? That's 1 ms not 100ms as the comment says?

Changed comment.

>
>> +    /* 1MB/s slow*/
>> +    migrate_set_parameter(from, "max-bandwidth", "1000000000");
>
> That's still 1GB/s isn't it?

Changed also.

> Don't you need to reduce that if xbzrle is actually working otherwise
> it'll complete?

It don't complete on my setup (dunno with a faster machine).

>> +    migrate_set_parameter(from, "xbzrle-cache-size", "33554432");
>
> That's 32M - why?

I need to check that the command is running, no clue about _which_ one
is better here.

> The test continually rewrites 100M of data; only changing one byte/page
> - so actually the fun way to do the xbzrle test is to leave this as 32M
> here.....

My idea here is that we somke test all the transports/commands.  Not
that I fully test everything.

See on my next series, It already takes around 15 seconds, just adding
stuff will make things go longer really fast.

BTW, is there a trivial way to convince qtest/getestr whatevre to run
all the migration tests in parallel?

Later, Juan.



>> +    migrate_set_capability(from, "xbzrle", "true");
>> +    migrate_set_capability(to, "xbzrle", "true");
>> +    /* Wait for the first serial output from the source */
>> +    wait_for_serial("src_serial");
>> +
>> +    migrate(from, uri);
>> +
>> +    wait_for_migration_pass(from);
>> +
>> +    /* 300ms it should converge */
>> +    migrate_set_parameter(from, "downtime-limit", "300");
>
> but first increase the xvzrle cache to 120M and give it a couple of
> seconds delay; you might even find it completes without the downtime
> limit schange; but you should still do that after a few seconds.
> You can check the stats as well, you should get some xbzrle cache hits
> as long as you raised the cache size.
>
> Dave
>
>> +    if (!got_stop) {
>> +        qtest_qmp_eventwait(from, "STOP");
>> +    }
>> +    qtest_qmp_eventwait(to, "RESUME");
>> +
>> +    wait_for_serial("dest_serial");
>> +    wait_for_migration_complete(from);
>> +
>> +    test_migrate_end(from, to);
>> +}
>> +
>> +static void test_xbzrle_unix(void)
>> +{
>> +    char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
>> +
>> +    test_xbzrle(uri);
>> +    g_free(uri);
>> +}
>> +
>> +
>>  int main(int argc, char **argv)
>>  {
>>      char template[] = "/tmp/migration-test-XXXXXX";
>> @@ -695,6 +762,7 @@ int main(int argc, char **argv)
>>      qtest_add_func("/migration/precopy/unix", test_precopy_unix);
>>      qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
>>      qtest_add_func("/migration/postcopy/unix", test_postcopy);
>> +    qtest_add_func("/migration/xbzrle/unix", test_xbzrle_unix);
>>  
>>      ret = g_test_run();
>>  
>> -- 
>> 2.14.3
>> 
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

Re: [Qemu-devel] [PATCH v3 5/6] tests: Add migration xbzrle test
Posted by Dr. David Alan Gilbert 8 years, 1 month ago
* Juan Quintela (quintela@redhat.com) wrote:
> "Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:
> > * Juan Quintela (quintela@redhat.com) wrote:
> >> Signed-off-by: Juan Quintela <quintela@redhat.com>
> >> ---
> >>  tests/migration-test.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >>  1 file changed, 68 insertions(+)
> >> 
> >> diff --git a/tests/migration-test.c b/tests/migration-test.c
> >> index 841c89e28a..41dee78a9a 100644
> >> --- a/tests/migration-test.c
> >> +++ b/tests/migration-test.c
> >> @@ -410,6 +410,20 @@ static void deprecated_set_speed(QTestState *who, const char *value)
> >>      migrate_check_parameter(who, "max-bandwidth", value);
> >>  }
> >>  
> >> +static void deprecated_set_cache_size(QTestState *who, const char *value)
> >> +{
> >> +    QDict *rsp;
> >> +    gchar *cmd;
> >> +
> >> +    cmd = g_strdup_printf("{ 'execute': 'migrate-set-cache-size',"
> >> +                          "'arguments': { 'value': %s } }", value);
> >> +    rsp = qtest_qmp(who, cmd);
> >> +    g_free(cmd);
> >> +    g_assert(qdict_haskey(rsp, "return"));
> >> +    QDECREF(rsp);
> >> +    migrate_check_parameter(who, "xbzrle-cache-size", value);
> >> +}
> >> +
> >>  static void migrate_set_parameter(QTestState *who, const char *parameter,
> >>                                    const char *value)
> >>  {
> >> @@ -424,6 +438,10 @@ static void migrate_set_parameter(QTestState *who, const char *parameter,
> >>          deprecated_set_speed(who, "12345");
> >>      }
> >>  
> >> +    if (strcmp(parameter, "xbzrle-cache-size") == 0) {
> >> +        deprecated_set_cache_size(who, "4096");
> >> +    }
> >> +
> >>      cmd = g_strdup_printf("{ 'execute': 'migrate-set-parameters',"
> >>                            "'arguments': { '%s': %s } }",
> >>                            parameter, value);
> >> @@ -673,6 +691,55 @@ static void test_precopy_tcp(void)
> >>      g_free(port);
> >>  }
> >>  
> >> +static void test_xbzrle(const char *uri)
> >> +{
> >> +    QTestState *from, *to;
> >> +
> >> +    test_migrate_start(&from, &to, uri);
> >> +
> >> +    /* We want to pick a speed slow enough that the test completes
> >> +     * quickly, but that it doesn't complete precopy even on a slow
> >> +     * machine, so also set the downtime.
> >> +     */
> >> +    /* 100 ms */
> >> +    migrate_set_parameter(from, "downtime-limit", "1");
> >
> > ? That's 1 ms not 100ms as the comment says?
> 
> Changed comment.
> 
> >
> >> +    /* 1MB/s slow*/
> >> +    migrate_set_parameter(from, "max-bandwidth", "1000000000");
> >
> > That's still 1GB/s isn't it?
> 
> Changed also.
> 
> > Don't you need to reduce that if xbzrle is actually working otherwise
> > it'll complete?
> 
> It don't complete on my setup (dunno with a faster machine).
> 
> >> +    migrate_set_parameter(from, "xbzrle-cache-size", "33554432");
> >
> > That's 32M - why?
> 
> I need to check that the command is running, no clue about _which_ one
> is better here.
> 
> > The test continually rewrites 100M of data; only changing one byte/page
> > - so actually the fun way to do the xbzrle test is to leave this as 32M
> > here.....
> 
> My idea here is that we somke test all the transports/commands.  Not
> that I fully test everything.

OK, but if you set the cache size to 150M instead of 32M then xbzrle
should actually kick in and be tested; at 32M very little is being
tested.

> See on my next series, It already takes around 15 seconds, just adding
> stuff will make things go longer really fast.
> 
> BTW, is there a trivial way to convince qtest/getestr whatevre to run
> all the migration tests in parallel?

Not that I know of.

Dave

> Later, Juan.
> 
> 
> 
> >> +    migrate_set_capability(from, "xbzrle", "true");
> >> +    migrate_set_capability(to, "xbzrle", "true");
> >> +    /* Wait for the first serial output from the source */
> >> +    wait_for_serial("src_serial");
> >> +
> >> +    migrate(from, uri);
> >> +
> >> +    wait_for_migration_pass(from);
> >> +
> >> +    /* 300ms it should converge */
> >> +    migrate_set_parameter(from, "downtime-limit", "300");
> >
> > but first increase the xvzrle cache to 120M and give it a couple of
> > seconds delay; you might even find it completes without the downtime
> > limit schange; but you should still do that after a few seconds.
> > You can check the stats as well, you should get some xbzrle cache hits
> > as long as you raised the cache size.
> >
> > Dave
> >
> >> +    if (!got_stop) {
> >> +        qtest_qmp_eventwait(from, "STOP");
> >> +    }
> >> +    qtest_qmp_eventwait(to, "RESUME");
> >> +
> >> +    wait_for_serial("dest_serial");
> >> +    wait_for_migration_complete(from);
> >> +
> >> +    test_migrate_end(from, to);
> >> +}
> >> +
> >> +static void test_xbzrle_unix(void)
> >> +{
> >> +    char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
> >> +
> >> +    test_xbzrle(uri);
> >> +    g_free(uri);
> >> +}
> >> +
> >> +
> >>  int main(int argc, char **argv)
> >>  {
> >>      char template[] = "/tmp/migration-test-XXXXXX";
> >> @@ -695,6 +762,7 @@ int main(int argc, char **argv)
> >>      qtest_add_func("/migration/precopy/unix", test_precopy_unix);
> >>      qtest_add_func("/migration/precopy/tcp", test_precopy_tcp);
> >>      qtest_add_func("/migration/postcopy/unix", test_postcopy);
> >> +    qtest_add_func("/migration/xbzrle/unix", test_xbzrle_unix);
> >>  
> >>      ret = g_test_run();
> >>  
> >> -- 
> >> 2.14.3
> >> 
> > --
> > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK