From: Hyman Huang <yong.huang@smartx.com>

Guestperf tool does not cover the multifd compression option
currently, it is worth supporting so that developers can
analysis the migration performance with different
compression algorithms.

Multifd support 4 compression algorithms currently:
zlib, zstd, qpl, uadk

To request that multifd with the specified compression
algorithm such as zlib:
$ ./scripts/migration/guestperf.py \
    --multifd --multifd-channels 4 --multifd-compression zlib \
    --output output.json

To run the entire standardized set of multifd compression
comparisons, with unix migration:
$ ./scripts/migration/guestperf-batch.py \
    --dst-host localhost --transport unix \
    --filter compr-multifd-compression* --output outputdir

Signed-off-by: Hyman Huang <yong.huang@smartx.com>
---
 scripts/migration/guestperf/comparison.py | 13 +++++++++++++
 scripts/migration/guestperf/engine.py     | 14 ++++++++++++++
 scripts/migration/guestperf/scenario.py   |  7 +++++--
 scripts/migration/guestperf/shell.py      |  3 +++
 4 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/scripts/migration/guestperf/comparison.py b/scripts/migration/guestperf/comparison.py
index 40e9d2eb1d..e209a68ce5 100644
--- a/scripts/migration/guestperf/comparison.py
+++ b/scripts/migration/guestperf/comparison.py
@@ -158,4 +158,17 @@ def __init__(self, name, scenarios):
         Scenario("compr-dirty-limit-50MB",
                  dirty_limit=True, vcpu_dirty_limit=50),
     ]),
+
+    # Looking at effect of multifd with
+    # different compression algorithms
+    Comparison("compr-multifd-compression", scenarios = [
+        Scenario("compr-multifd-compression-zlib",
+                 multifd=True, multifd_channels=4, multifd_compression="zlib"),
+        Scenario("compr-multifd-compression-zstd",
+                 multifd=True, multifd_channels=4, multifd_compression="zstd"),
+        Scenario("compr-multifd-compression-qpl",
+                 multifd=True, multifd_channels=4, multifd_compression="qpl"),
+        Scenario("compr-multifd-compression-uadk",
+                 multifd=True, multifd_channels=4, multifd_compression="uadk"),
+    ]),
 ]
diff --git a/scripts/migration/guestperf/engine.py b/scripts/migration/guestperf/engine.py
index 4cddd05a9d..59e77edb72 100644
--- a/scripts/migration/guestperf/engine.py
+++ b/scripts/migration/guestperf/engine.py
@@ -31,6 +31,8 @@
                              '..', '..', '..', 'python'))
 from qemu.machine import QEMUMachine
 
+# multifd supported compression algorithms
+MULTIFD_CMP_ALGS = ("zlib", "zstd", "qpl", "uadk")
 
 class Engine(object):
 
@@ -191,6 +193,12 @@ def _migrate(self, hardware, scenario, src,
                                scenario._compression_xbzrle_cache))
 
         if scenario._multifd:
+            if (scenario._multifd_compression and
+                (scenario._multifd_compression not in MULTIFD_CMP_ALGS)):
+                    raise Exception("unsupported multifd compression "
+                                    "algorithm: %s" %
+                                    scenario._multifd_compression)
+
             resp = src.cmd("migrate-set-capabilities",
                            capabilities = [
                                { "capability": "multifd",
@@ -206,6 +214,12 @@ def _migrate(self, hardware, scenario, src,
             resp = dst.cmd("migrate-set-parameters",
                            multifd_channels=scenario._multifd_channels)
 
+            if scenario._multifd_compression:
+                resp = src.cmd("migrate-set-parameters",
+                    multifd_compression=scenario._multifd_compression)
+                resp = dst.cmd("migrate-set-parameters",
+                    multifd_compression=scenario._multifd_compression)
+
         if scenario._dirty_limit:
             if not hardware._dirty_ring_size:
                 raise Exception("dirty ring size must be configured when "
diff --git a/scripts/migration/guestperf/scenario.py b/scripts/migration/guestperf/scenario.py
index 154c4f5d5f..4be7fafebf 100644
--- a/scripts/migration/guestperf/scenario.py
+++ b/scripts/migration/guestperf/scenario.py
@@ -30,7 +30,7 @@ def __init__(self, name,
                  auto_converge=False, auto_converge_step=10,
                  compression_mt=False, compression_mt_threads=1,
                  compression_xbzrle=False, compression_xbzrle_cache=10,
-                 multifd=False, multifd_channels=2,
+                 multifd=False, multifd_channels=2, multifd_compression="",
                  dirty_limit=False, x_vcpu_dirty_limit_period=500,
                  vcpu_dirty_limit=1):
 
@@ -61,6 +61,7 @@ def __init__(self, name,
 
         self._multifd = multifd
         self._multifd_channels = multifd_channels
+        self._multifd_compression = multifd_compression
 
         self._dirty_limit = dirty_limit
         self._x_vcpu_dirty_limit_period = x_vcpu_dirty_limit_period
@@ -85,6 +86,7 @@ def serialize(self):
             "compression_xbzrle_cache": self._compression_xbzrle_cache,
             "multifd": self._multifd,
             "multifd_channels": self._multifd_channels,
+            "multifd_compression": self._multifd_compression,
             "dirty_limit": self._dirty_limit,
             "x_vcpu_dirty_limit_period": self._x_vcpu_dirty_limit_period,
             "vcpu_dirty_limit": self._vcpu_dirty_limit,
@@ -109,4 +111,5 @@ def deserialize(cls, data):
             data["compression_xbzrle"],
             data["compression_xbzrle_cache"],
             data["multifd"],
-            data["multifd_channels"])
+            data["multifd_channels"],
+            data["multifd_compression"])
diff --git a/scripts/migration/guestperf/shell.py b/scripts/migration/guestperf/shell.py
index c85d89efec..1452eb8a33 100644
--- a/scripts/migration/guestperf/shell.py
+++ b/scripts/migration/guestperf/shell.py
@@ -130,6 +130,8 @@ def __init__(self):
                             action="store_true")
         parser.add_argument("--multifd-channels", dest="multifd_channels",
                             default=2, type=int)
+        parser.add_argument("--multifd-compression", dest="multifd_compression",
+                            default="")
 
         parser.add_argument("--dirty-limit", dest="dirty_limit", default=False,
                             action="store_true")
@@ -166,6 +168,7 @@ def get_scenario(self, args):
 
                         multifd=args.multifd,
                         multifd_channels=args.multifd_channels,
+                        multifd_compression=args.multifd_compression,
 
                         dirty_limit=args.dirty_limit,
                         x_vcpu_dirty_limit_period=\
-- 
2.11.0