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Date: Wed, 23 Jul 2014 15:12:52 -0700 (PDT) From: David Miller <davem@...emloft.net> To: jasowang@...hat.com Cc: rusty@...tcorp.com.au, mst@...hat.com, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 net-next 0/2] rx busy polling support for virtio-net From: Jason Wang <jasowang@...hat.com> Date: Wed, 23 Jul 2014 16:33:53 +0800 > This series introduces the support for rx busy polling support. This > was useful for reduing the latency for a kvm guest. Instead of > introducing new states and spinlocks, this series 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 was useless > > Changes from V1: > - split the patch info smaller ones > - add more details about test setup/configuration Series applied, thanks Jason. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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