netdev - Re: [PATCH net-next v2] net: vhost: improve performance when enable busyloop

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Date:   Thu, 28 Jun 2018 14:42:47 +0800
From:   Tonghao Zhang <xiangxia.m.yue@...il.com>
To:     jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Tonghao Zhang <zhangtonghao@...ichuxing.com>, mst@...hat.com
Subject: Re: [PATCH net-next v2] net: vhost: improve performance when enable busyloop

On Wed, Jun 27, 2018 at 10:24 PM Jason Wang <jasowang@...hat.com> wrote:
>
>
>
> On 2018年06月26日 13:17, xiangxia.m.yue@...il.com wrote:
> > From: Tonghao Zhang <xiangxia.m.yue@...il.com>
> >
> > This patch improves the guest receive performance from
> > host. On the handle_tx side, we poll the sock receive
> > queue at the same time. handle_rx do that in the same way.
> >
> > For avoiding deadlock, change the code to lock the vq one
> > by one and use the VHOST_NET_VQ_XX as a subclass for
> > mutex_lock_nested. With the patch, qemu can set differently
> > the busyloop_timeout for rx or tx queue.
> >
> > We set the poll-us=100us and use the iperf3 to test
> > its throughput. The iperf3 command is shown as below.
> >
> > on the guest:
> > iperf3  -s -D
> >
> > on the host:
> > iperf3  -c 192.168.1.100 -i 1 -P 10 -t 10 -M 1400
> >
> > * With the patch:     23.1 Gbits/sec
> > * Without the patch:  12.7 Gbits/sec
> >
> > Signed-off-by: Tonghao Zhang <zhangtonghao@...ichuxing.com>
>
> Thanks a lot for the patch. Looks good generally, but please split this
> big patch into separate ones like:
>
> patch 1: lock vqs one by one
> patch 2: replace magic number of lock annotation
> patch 3: factor out generic busy polling logic to vhost_net_busy_poll()
> patch 4: add rx busy polling in tx path.
>
> And please cc Michael in v3.
Thanks. will be done.

> Thanks