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

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Date:   Wed, 29 Nov 2023 23:29:10 +0800
From:   Zhu Yanjun <yanjun.zhu@...ux.dev>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Liang Chen <liangchen.linux@...il.com>, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, xuanzhuo@...ux.alibaba.com,
        kuba@...nel.org, edumazet@...gle.com, davem@...emloft.net,
        pabeni@...hat.com, alexander.duyck@...il.com
Subject: Re: [PATCH net-next 2/5] virtio_net: Add page_pool support to improve
 performance


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. ^_^

Best Regards,

Zhu Yanjun


>
> It is interesting.
>
> Zhu Yanjun
>
>>