netdev - Re: [PATCH net-next V2 0/3] basic in order support for vhost

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Message-ID: <93632cde-bfc6-a284-c40c-d544d7c12d7c@redhat.com>
Date:   Wed, 9 Jan 2019 20:19:58 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next V2 0/3] basic in order support for vhost_net


On 2019/1/9 下午4:05, Jason Wang wrote:
> Hi:
>
> This series implement basic in order feature support for
> vhost_net. This feature requires both driver and device to use
> descriptors in order which can simplify the implementation and
> optimizaton for both side. The series also implement a simple
> optimization that avoid read available ring. Test shows 10%
> performance improvement at most.
>
> More optimizations could be done on top.
>
> Changes from V1:
> - no code changes
> - add result of SMAP off


Just notice the patch works only for some specific case e.g a buffer 
only contain one descriptor. Will respin.

Thanks


>
> Jason Wang (3):
>    virtio: introduce in order feature bit
>    vhost_net: support in order feature
>    vhost: don't touch avail ring if in_order is negotiated
>
>   drivers/vhost/net.c                |  6 ++++--
>   drivers/vhost/vhost.c              | 19 ++++++++++++-------
>   include/uapi/linux/virtio_config.h |  6 ++++++
>   3 files changed, 22 insertions(+), 9 deletions(-)
>