search for: busy_read

...ries re-uses NAPI state to synchonrize between NAPI and busy polling. This grealy simplified the codes and reduce the overheads of spinlocks for normal NAPI fast path. Test was done between a kvm guest and an external host. Two hosts were connected through 40gb mlx4 cards. With both busy_poll and busy_read are set to 50 in guest, 1 byte netperf tcp_rr shows 127% improvement: transaction rate was increased from 8353.33 to 18966.87. Changes from V2: - Avoid introducing new states and spinlocks by reusuing the NAPI state - Fix the budget calculation in virtnet_poll() - Drop patch 1/3 from V2 since it...

...ries re-uses NAPI state to synchonrize between NAPI and busy polling. This grealy simplified the codes and reduce the overheads of spinlocks for normal NAPI fast path. Test was done between a kvm guest and an external host. Two hosts were connected through 40gb mlx4 cards. With both busy_poll and busy_read are set to 50 in guest, 1 byte netperf tcp_rr shows 127% improvement: transaction rate was increased from 8353.33 to 18966.87. Changes from V2: - Avoid introducing new states and spinlocks by reusuing the NAPI state - Fix the budget calculation in virtnet_poll() - Drop patch 1/3 from V2 since it...

...g support. This was useful for reduing the latency for a kvm guest. Patch 1-2 introduces helpers which is used for rx busy polling. Patch 3 implement the main function. Test was done between a kvm guest and an external host. Two hosts were connected through 40gb mlx4 cards. With both busy_poll and busy_read are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: transaction rate was increased from 9151.94 to 19787.37. Changes from V1: - split the patch info smaller ones - add more details about test setup/configuration Please review. Jason Wang (3): virtio-net: introduce helpers to...

...g support. This was useful for reduing the latency for a kvm guest. Patch 1-2 introduces helpers which is used for rx busy polling. Patch 3 implement the main function. Test was done between a kvm guest and an external host. Two hosts were connected through 40gb mlx4 cards. With both busy_poll and busy_read are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: transaction rate was increased from 9151.94 to 19787.37. Changes from V1: - split the patch info smaller ones - add more details about test setup/configuration Please review. Jason Wang (3): virtio-net: introduce helpers to...

...38 PM, Varka Bhadram wrote: >> On 07/16/2014 11:51 AM, Jason Wang wrote: >>> Add basic support for rx busy polling. >>> >>> Test was done between a kvm guest and an external host. Two hosts were >>> connected through 40gb mlx4 cards. With both busy_poll and busy_read >>> are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: >>> transaction rate was increased from 9151.94 to 19787.37. >>> >>> Cc: Rusty Russell <rusty at rustcorp.com.au> >>> Cc: Michael S. Tsirkin <mst at redhat.com> >&gt...

...38 PM, Varka Bhadram wrote: >> On 07/16/2014 11:51 AM, Jason Wang wrote: >>> Add basic support for rx busy polling. >>> >>> Test was done between a kvm guest and an external host. Two hosts were >>> connected through 40gb mlx4 cards. With both busy_poll and busy_read >>> are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: >>> transaction rate was increased from 9151.94 to 19787.37. >>> >>> Cc: Rusty Russell <rusty at rustcorp.com.au> >>> Cc: Michael S. Tsirkin <mst at redhat.com> >&gt...

On 07/16/2014 11:51 AM, Jason Wang wrote: > Add basic support for rx busy polling. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read > are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. > > Cc: Rusty Russell <rusty at rustcorp.com.au> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Vlad Yasevich <vyasevic at redhat.c...

On 07/16/2014 11:51 AM, Jason Wang wrote: > Add basic support for rx busy polling. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read > are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. > > Cc: Rusty Russell <rusty at rustcorp.com.au> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Vlad Yasevich <vyasevic at redhat.c...

...l for reduing the latency for a kvm guest. Patch 1-2 > introduces helpers which is used for rx busy polling. Patch 3 > implement the main function. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read are > set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. > > Changes from V1: > - split the patch info smaller ones > - add more details about test setup/configuration > > Please review. Looks like...

...l for reduing the latency for a kvm guest. Patch 1-2 > introduces helpers which is used for rx busy polling. Patch 3 > implement the main function. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read are > set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. > > Changes from V1: > - split the patch info smaller ones > - add more details about test setup/configuration > > Please review. Generally I...

On 07/16/2014 04:38 PM, Varka Bhadram wrote: > On 07/16/2014 11:51 AM, Jason Wang wrote: >> Add basic support for rx busy polling. >> >> Test was done between a kvm guest and an external host. Two hosts were >> connected through 40gb mlx4 cards. With both busy_poll and busy_read >> are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: >> transaction rate was increased from 9151.94 to 19787.37. >> >> Cc: Rusty Russell <rusty at rustcorp.com.au> >> Cc: Michael S. Tsirkin <mst at redhat.com> >> Cc: Vlad Yasevich...

...wrote: >>> On 07/16/2014 11:51 AM, Jason Wang wrote: >>>> Add basic support for rx busy polling. >>>> >>>> Test was done between a kvm guest and an external host. Two hosts were >>>> connected through 40gb mlx4 cards. With both busy_poll and busy_read >>>> are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: >>>> transaction rate was increased from 9151.94 to 19787.37. >>>> >>>> Cc: Rusty Russell <rusty at rustcorp.com.au> >>>> Cc: Michael S. Tsirkin <mst at re...

On Wed, Jul 16, 2014 at 02:21:47PM +0800, Jason Wang wrote: > Add basic support for rx busy polling. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read > are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. Pls include data about non polling tests: any effect on cpu utilization there? There could be as we are adding locking. > > Cc: Rusty Russell <rusty a...

On Wed, Jul 16, 2014 at 02:21:47PM +0800, Jason Wang wrote: > Add basic support for rx busy polling. > > Test was done between a kvm guest and an external host. Two hosts were > connected through 40gb mlx4 cards. With both busy_poll and busy_read > are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: > transaction rate was increased from 9151.94 to 19787.37. Pls include data about non polling tests: any effect on cpu utilization there? There could be as we are adding locking. > > Cc: Rusty Russell <rusty a...

Add basic support for rx busy polling. Test was done between a kvm guest and an external host. Two hosts were connected through 40gb mlx4 cards. With both busy_poll and busy_read are set to 50 in guest, 1 byte netperf tcp_rr shows 116% improvement: transaction rate was increased from 9151.94 to 19787.37. Cc: Rusty Russell <rusty at rustcorp.com.au> Cc: Michael S. Tsirkin <mst at redhat.com> Cc: Vlad Yasevich <vyasevic at redhat.com> Cc: Eric Dumazet <e...