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Date:	Mon, 03 Aug 2015 14:23:08 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH net-next] virtio_net: add gro capability

From: Eric Dumazet <>
Date: Fri, 31 Jul 2015 18:25:17 +0200

> From: Eric Dumazet <>
> Straightforward patch to add GRO processing to virtio_net.
> napi_complete_done() usage allows more aggressive aggregation,
> opted-in by setting /sys/class/net/xxx/gro_flush_timeout
> Tested:
> Setting /sys/class/net/xxx/gro_flush_timeout to 1000 nsec,
> Rick Jones reported following results.
> One VM of each on a pair of OpenStack compute nodes with E5-2650Lv3 CPUs
> and Intel 82599ES-based NICs. So, two "before" and two "after" VMs.
> The OpenStack compute nodes were running OpenStack Kilo, with VxLAN
> encapsulation being used through OVS so no GRO coming-up the host
> stack.  The compute nodes themselves were running a 3.14-based kernel.
> Single-stream netperf, CPU utilizations and thus service demands are
> based on intra-guest reported CPU.
> Signed-off-by: Eric Dumazet <>
> Tested-by: Rick Jones <>

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