linux-kernel - Re: [PATCH V7 19/19] virtio

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Message-ID: <CACGkMEszC5kvkWpSiK9pZQ-_T1-74perH=FXkAOYeCffy7kc0Q@mail.gmail.com>
Date: Tue, 14 Oct 2025 11:50:49 +0800
From: Jason Wang <jasowang@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: xuanzhuo@...ux.alibaba.com, eperezma@...hat.com, 
	virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V7 19/19] virtio_ring: add in order support

On Fri, Sep 26, 2025 at 10:48 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Thu, Sep 25, 2025 at 06:37:08PM +0800, Jason Wang wrote:
> > This patch implements in order support for both split virtqueue and
> > packed virtqueue. Performance could be gained for the device where the
> > memory access could be expensive (e.g vhost-net or a real PCI device):
> >
> > Benchmark with KVM guest:
> >
> > Vhost-net on the host: (pktgen + XDP_DROP):
> >
> >          in_order=off | in_order=on | +%
> >     TX:  5.20Mpps     | 6.20Mpps    | +19%
> >     RX:  3.47Mpps     | 3.61Mpps    | + 4%
> >
> > Vhost-user(testpmd) on the host: (pktgen/XDP_DROP):
> >
> > For split virtqueue:
> >
> >          in_order=off | in_order=on | +%
> >     TX:  5.60Mpps     | 5.60Mpps    | +0.0%
> >     RX:  9.16Mpps     | 9.61Mpps    | +4.9%
> >
> > For packed virtqueue:
> >
> >          in_order=off | in_order=on | +%
> >     TX:  5.60Mpps     | 5.70Mpps    | +1.7%
> >     RX:  10.6Mpps     | 10.8Mpps    | +1.8%
> >
> > Benchmark also shows no performance impact for in_order=off for queue
> > size with 256 and 1024.
> >
> > Signed-off-by: Jason Wang <jasowang@...hat.com>
> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>
>
> I'm not sure why my signoff is here but it does not look my
> comments have been addressed.

I will remove it.

>
> For example, see 20250921133711-mutt-send-email-mst@...nel.org
>
>
>
> Could you pls go over my comments again and check they
> have all been addressed?
>

It has been replied here:

https://lkml.org/lkml/2025/9/22/28

Please tell me if it's ok for you or not.

Thanks