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...race in RX VQ processing") we cannot place virtqueue_enable_cb_prepare() after NAPI_STATE_SCHED is cleared, so disable interrupts again if napi_complete_done() returned false. Tested with vhost-user of OVS 2.7 on host, which does not have the event idx feature. * Before patch: $ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472 MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 212992 1...

...race in RX VQ processing") we cannot place virtqueue_enable_cb_prepare() after NAPI_STATE_SCHED is cleared, so disable interrupts again if napi_complete_done() returned false. Tested with vhost-user of OVS 2.7 on host, which does not have the event idx feature. * Before patch: $ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472 MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 212992 1...

...8.33.4 (192.168.33.4) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 128 10.00 635.45 # netperf -H 192.168.33.4,ipv4 -t UDP_STREAM MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.33.4 (192.168.33.4) port 0 AF_INET Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 122880 65...

...8.33.4 (192.168.33.4) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 128 10.00 635.45 # netperf -H 192.168.33.4,ipv4 -t UDP_STREAM MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.33.4 (192.168.33.4) port 0 AF_INET Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 122880 65...

...er cycle cost, e.g., in TCP_RR tests. This is not limited to the patch that enables tx completion cleaning in rx napi. - use trylock to avoid contention between tx and rx napi - keep interrupts masked during xmit_more (new patch 5/5) this improves cycles especially for multi UDP_STREAM, which does not benefit from cleaning tx completions on rx napi. - move free_old_xmit_skbs (new patch 3/5) to avoid forward declaration not changed: - deduplicate virnet_poll_tx and virtnet_poll_txclean they look similar, but have differ too much to make it wo...

...er cycle cost, e.g., in TCP_RR tests. This is not limited to the patch that enables tx completion cleaning in rx napi. - use trylock to avoid contention between tx and rx napi - keep interrupts masked during xmit_more (new patch 5/5) this improves cycles especially for multi UDP_STREAM, which does not benefit from cleaning tx completions on rx napi. - move free_old_xmit_skbs (new patch 3/5) to avoid forward declaration not changed: - deduplicate virnet_poll_tx and virtnet_poll_txclean they look similar, but have differ too much to make it wo...

...way a faster one and it should not introduce a lot of noise. I can >>>> test with two VM if you think that this use of network namespace >>>> introduces too much noise. >>>> >>>> Thanks! >>>> >>>>>>>> - netperf UDP_STREAM shows a performance increase of 1.8, almost >>>>>>>> doubling performance. This gets lower as frame size increase. >>> Regarding UDP_STREAM: >>> * with event_idx=on: The performance difference is reduced a lot if >>> applied affinity properly (manu...

...ure into per-queue one. This should not impact on performance since each queue counter is not updated concurrently by multiple cpus. Performance numbers: - Guest has 2 vcpus and 2 queues - Guest runs netserver - Host runs 100-flow super_netperf Before After Diff UDP_STREAM 18byte 86.22 87.00 +0.90% UDP_STREAM 1472byte 4055.27 4042.18 -0.32% TCP_STREAM 16956.32 16890.63 -0.39% UDP_RR 178667.11 185862.70 +4.03% TCP_RR 128473.04 124985.81 -2.71% Signed-off-by: Toshiaki Makita <makita.toshiak...

.... I can > > >>>> test with two VM if you think that this use of network namespace > > >>>> introduces too much noise. > > >>>> > > >>>> Thanks! > > >>>> > > >>>>>>>> - netperf UDP_STREAM shows a performance increase of 1.8, almost > > >>>>>>>> doubling performance. This gets lower as frame size increase. > > >>> Regarding UDP_STREAM: > > >>> * with event_idx=on: The performance difference is reduced a lot if > > >...

...ace virtqueue_enable_cb_prepare() after > NAPI_STATE_SCHED is cleared, so disable interrupts again if > napi_complete_done() returned false. > > Tested with vhost-user of OVS 2.7 on host, which does not have the event > idx feature. > > * Before patch: > > $ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472 > MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET > Socket Message Elapsed Messages > Size Size Time Okay Errors Throughput > bytes bytes secs # # 10^6b...

...r sending and receiving, but I find this >> way a faster one and it should not introduce a lot of noise. I can >> test with two VM if you think that this use of network namespace >> introduces too much noise. >> >> Thanks! >> >>>>>> - netperf UDP_STREAM shows a performance increase of 1.8, almost >>>>>> doubling performance. This gets lower as frame size increase. > Regarding UDP_STREAM: > * with event_idx=on: The performance difference is reduced a lot if > applied affinity properly (manually assigning CPU on host/guest...

...after >> NAPI_STATE_SCHED is cleared, so disable interrupts again if >> napi_complete_done() returned false. >> >> Tested with vhost-user of OVS 2.7 on host, which does not have the event >> idx feature. >> >> * Before patch: >> >> $ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472 >> MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET >> Socket Message Elapsed Messages >> Size Size Time Okay Errors Throughput >> bytes bytes secs...

...after >> NAPI_STATE_SCHED is cleared, so disable interrupts again if >> napi_complete_done() returned false. >> >> Tested with vhost-user of OVS 2.7 on host, which does not have the event >> idx feature. >> >> * Before patch: >> >> $ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472 >> MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET >> Socket Message Elapsed Messages >> Size Size Time Okay Errors Throughput >> bytes bytes secs...

...er cycle cost, e.g., in TCP_RR tests. This is not limited to the patch that enables tx completion cleaning in rx napi. - use trylock to avoid contention between tx and rx napi - keep interrupts masked during xmit_more (new patch 5/5) this improves cycles especially for multi UDP_STREAM, which does not benefit from cleaning tx completions on rx napi. - move free_old_xmit_skbs (new patch 3/5) to avoid forward declaration not changed: - deduplicate virnet_poll_tx and virtnet_poll_txclean they look similar, but have differ too much to make it wo...

...er cycle cost, e.g., in TCP_RR tests. This is not limited to the patch that enables tx completion cleaning in rx napi. - use trylock to avoid contention between tx and rx napi - keep interrupts masked during xmit_more (new patch 5/5) this improves cycles especially for multi UDP_STREAM, which does not benefit from cleaning tx completions on rx napi. - move free_old_xmit_skbs (new patch 3/5) to avoid forward declaration not changed: - deduplicate virnet_poll_tx and virtnet_poll_txclean they look similar, but have differ too much to make it wo...

...this > > way a faster one and it should not introduce a lot of noise. I can > > test with two VM if you think that this use of network namespace > > introduces too much noise. > > > > Thanks! > > > > > > > > > > > > > - netperf UDP_STREAM shows a performance increase of 1.8, almost > > > > > > doubling performance. This gets lower as frame size increase. > > Regarding UDP_STREAM: > * with event_idx=on: The performance difference is reduced a lot if > applied affinity properly (manually assigning CPU on...

This still causes corruption issues for people so don't try to use in production please. Posting to expedite debugging. This adds infrastructure required for supporting multiple ring formats. The idea is as follows: we convert descriptors to an independent format first, and process that converting to iov later. Used ring is similar: we fetch into an independent struct first, convert that to

This still causes corruption issues for people so don't try to use in production please. Posting to expedite debugging. This adds infrastructure required for supporting multiple ring formats. The idea is as follows: we convert descriptors to an independent format first, and process that converting to iov later. Used ring is similar: we fetch into an independent struct first, convert that to

...e)--> [Server] - Set 10us busypoll. - Guest disables checksum and TSO because of host XDP. - Measured single flow Mbps by netperf, and kicks by perf kvm stat (EPT_MISCONFIG event). Before After Mbps kicks/s Mbps kicks/s UDP_STREAM 1472byte 247758 27 Send 3645.37 6958.10 Recv 3588.56 6958.10 1byte 9865 37 Send 4.34 5.43 Recv 4.17...

...e)--> [Server] - Set 10us busypoll. - Guest disables checksum and TSO because of host XDP. - Measured single flow Mbps by netperf, and kicks by perf kvm stat (EPT_MISCONFIG event). Before After Mbps kicks/s Mbps kicks/s UDP_STREAM 1472byte 247758 27 Send 3645.37 6958.10 Recv 3588.56 6958.10 1byte 9865 37 Send 4.34 5.43 Recv 4.17...