Messages in this thread | | | From | Jason Wang <> | Subject | [PATCH v3 net-next 0/2] rx busy polling support for virtio-net | Date | Wed, 23 Jul 2014 16:33:53 +0800 |
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Hi all:
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
Jason Wang (2): virtio-net: introduce virtnet_receive() virtio-net: rx busy polling support
drivers/net/virtio_net.c | 67 +++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 61 insertions(+), 6 deletions(-)
-- 1.8.3.1
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