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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.165.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1695365883147100001 Content-Type: text/plain; charset="utf-8" In multifd_send_sync_main we need to wait for channels_ready before submitting sync packet as the threads may still be sending their previous pages. There is also no need to check for channels_ready in the loop before the wait for sem_sync, next iteration of sending pages or another sync will start with waiting for channels_ready semaphore. Changes to commit 90b3cec351996dd8ef4eb847ad38607812c5e7f5 ("multifd: Fix the number of channels ready") Signed-off-by: Elena Ufimtseva --- migration/multifd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/migration/multifd.c b/migration/multifd.c index 0f6b203877..e61e458151 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -595,6 +595,7 @@ int multifd_send_sync_main(QEMUFile *f) } } =20 + qemu_sem_wait(&multifd_send_state->channels_ready); /* * When using zero-copy, it's necessary to flush the pages before any = of * the pages can be sent again, so we'll make sure the new version of = the @@ -630,7 +631,6 @@ int multifd_send_sync_main(QEMUFile *f) for (i =3D 0; i < migrate_multifd_channels(); i++) { MultiFDSendParams *p =3D &multifd_send_state->params[i]; =20 - qemu_sem_wait(&multifd_send_state->channels_ready); trace_multifd_send_sync_main_wait(p->id); qemu_sem_wait(&p->sem_sync); =20 --=20 2.34.1 From nobody Sat May 18 06:50:52 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.165.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1695365905680100001 Content-Type: text/plain; charset="utf-8" In migration rate limiting atomic operations are used to read the rate limit variables and transferred bytes and they are expensive. Check first if rate_limit_max is equal to RATE_LIMIT_DISABLED and return false immediately if so. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas Reviewed-by: Peter Xu --- migration/migration-stats.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/migration/migration-stats.c b/migration/migration-stats.c index 095d6d75bb..abc31483d5 100644 --- a/migration/migration-stats.c +++ b/migration/migration-stats.c @@ -24,14 +24,14 @@ bool migration_rate_exceeded(QEMUFile *f) return true; } =20 - uint64_t rate_limit_start =3D stat64_get(&mig_stats.rate_limit_start); - uint64_t rate_limit_current =3D migration_transferred_bytes(f); - uint64_t rate_limit_used =3D rate_limit_current - rate_limit_start; uint64_t rate_limit_max =3D stat64_get(&mig_stats.rate_limit_max); - if (rate_limit_max =3D=3D RATE_LIMIT_DISABLED) { return false; } + uint64_t rate_limit_start =3D stat64_get(&mig_stats.rate_limit_start); + uint64_t rate_limit_current =3D migration_transferred_bytes(f); + uint64_t rate_limit_used =3D rate_limit_current - rate_limit_start; + if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) { return true; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.165.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1695365842580100001 Content-Type: text/plain; charset="utf-8" Previous commit cbec7eb76879d419e7dbf531ee2506ec0722e825 "migration/multifd: Compute transferred bytes correctly" removed accounting for packet_len in non-rdma case, but the next_packet_size only accounts for pages, not for the header packet (normal_pages * PAGE_SIZE) that is being sent as iov[0]. The packet_len part should be added to account for the size of MultiFDPacket and the array of the offsets. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas --- migration/multifd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/migration/multifd.c b/migration/multifd.c index e61e458151..3281397b18 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -714,8 +714,6 @@ static void *multifd_send_thread(void *opaque) if (ret !=3D 0) { break; } - stat64_add(&mig_stats.multifd_bytes, p->packet_len); - stat64_add(&mig_stats.transferred, p->packet_len); } else { /* Send header using the same writev call */ p->iov[0].iov_len =3D p->packet_len; @@ -728,8 +726,10 @@ static void *multifd_send_thread(void *opaque) break; } =20 - stat64_add(&mig_stats.multifd_bytes, p->next_packet_size); - stat64_add(&mig_stats.transferred, p->next_packet_size); + stat64_add(&mig_stats.multifd_bytes, + p->next_packet_size + p->packet_len); + stat64_add(&mig_stats.transferred, + p->next_packet_size + p->packet_len); qemu_mutex_lock(&p->mutex); p->pending_job--; qemu_mutex_unlock(&p->mutex); 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.220.177.32; envelope-from=elena.ufimtseva@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @oracle.com) X-ZM-MESSAGEID: 1695365854700100001 Content-Type: text/plain; charset="utf-8" Sometimes multifd sends just sync packet with no pages (normal_num is 0). In this case the old value is being preserved and being accounted for while only packet_len is being transferred. Reset it to 0 after sending and accounting for. TODO: Fix the same packet ids in the stream. with this patch, there is still an issue with the duplicated packets ids being sent (with different number of pages/flags). See in below multifd_send trace (before this change): multifd_send 394.774 pid=3D55477 id=3D0x1 packet_num=3D0x6f0 normal=3D0x57 = flags=3D0x1 next_packet_size=3D0x57000 multifd_send 181.244 pid=3D55477 id=3D0x1 packet_num=3D0x6f0 normal=3D0x0 f= lags=3D0x0 next_packet_size=3D0x57000 With this commit there are still duplicated packets, but since no pages are being sent with sync flag set, next_packet_size is 0: multifd_send 27.814 pid=3D18602 id=3D0x1 packet_num=3D0x574 normal=3D0x7b f= lags=3D0x1 next_packet_size=3D0x7b000 multifd_send 136054.792 pid=3D18602 id=3D0x1 packet_num=3D0x574 normal=3D0x= 0 flags=3D0x0 next_packet_size=3D0x0 If there is a suggestion how to fix this properly, I will be glad to use it. Signed-off-by: Elena Ufimtseva Reviewed-by: Fabiano Rosas --- migration/multifd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/migration/multifd.c b/migration/multifd.c index 3281397b18..8b4e26051b 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -730,6 +730,7 @@ static void *multifd_send_thread(void *opaque) p->next_packet_size + p->packet_len); stat64_add(&mig_stats.transferred, p->next_packet_size + p->packet_len); + p->next_packet_size =3D 0; qemu_mutex_lock(&p->mutex); p->pending_job--; qemu_mutex_unlock(&p->mutex); --=20 2.34.1