netdev - Re: [PATCH net-next 2/5] virtio_net: Add page

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Date: Thu, 30 Nov 2023 10:34:54 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Zhu Yanjun <yanjun.zhu@...ux.dev>
Cc: Liang Chen <liangchen.linux@...il.com>,
 jasowang@...hat.com,
 virtualization@...ts.linux-foundation.org,
 netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 kuba@...nel.org,
 edumazet@...gle.com,
 davem@...emloft.net,
 pabeni@...hat.com,
 alexander.duyck@...il.com,
 "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH net-next 2/5] virtio_net: Add page_pool support to improve performance

On Wed, 29 Nov 2023 23:29:10 +0800, Zhu Yanjun <yanjun.zhu@...ux.dev> wrote:
>
> 在 2023/11/29 23:22, Zhu Yanjun 写道:
> >
> > 在 2023/11/29 22:59, Michael S. Tsirkin 写道:
> >> On Wed, Nov 29, 2023 at 10:50:57PM +0800, Zhu Yanjun wrote:
> >>> 在 2023/5/26 13:46, Liang Chen 写道:
> >>
> >> what made you respond to a patch from May, now?
> >
> > I want to apply page_pool to our virtio_net. This virtio_net works on
> > our device.
> >
> > I want to verify whether page_pool on virtio_net with our device can
> > improve the performance or not.
> >
> > And I found that ethtool is wrong.
> >
> > I use virtio_net on our device. I found that page member variable in
> > rq is not used in recv path.
> >
> > When virtio_net is modprobe, I checked page member variable in rq with
> > kprobe or crash tool.  page member variable in rq is always NULL.
> >
> > But sg in recv path is used.
> >
> > So how to use page member variable in rq? If page member variable in
> > rq is always NULL, can we remove it?
> >
> > BTW, I use ping and iperf tool to make tests with virtio_net. In the
> > tests, page member variable in rq is always NULL.
>
>
> And I replaced page member variable in rq with page_pool, but the
> statistics of page_pool are always 0.
>
> It is interesting that page_pool member variable in rq is not used in
> ping and iperf tests.
>
> I am not sure what tests can make page member variable not NULL. ^_^

Do you mean rq->pages?

That is for big mode.

Thanks.


>
> Best Regards,
>
> Zhu Yanjun
>
>
> >
> > It is interesting.
> >
> > Zhu Yanjun
> >
> >>