netdev - Re: [PATCH net-next v10] virtio/vsock: replace virtio_vsock_pkt with sk

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Date:   Tue, 17 Jan 2023 23:14:44 +0000
From:   Bobby Eshleman <bobbyeshleman@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     Bobby Eshleman <bobby.eshleman@...edance.com>,
        Cong Wang <cong.wang@...edance.com>, kvm@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
        Arseniy Krasnov <AVKrasnov@...rdevices.ru>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Eric Dumazet <edumazet@...gle.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v10] virtio/vsock: replace virtio_vsock_pkt with
 sk_buff

On Mon, Jan 16, 2023 at 12:12:07PM +0100, Stefano Garzarella wrote:
> On Fri, Jan 13, 2023 at 10:21:37PM +0000, Bobby Eshleman wrote:
> > This commit changes virtio/vsock to use sk_buff instead of
> > virtio_vsock_pkt. Beyond better conforming to other net code, using
> > sk_buff allows vsock to use sk_buff-dependent features in the future
> > (such as sockmap) and improves throughput.
> > 
> > This patch introduces the following performance changes:
> > 
> > Tool: Uperf
> > Env: Phys Host + L1 Guest
> > Payload: 64k
> > Threads: 16
> > Test Runs: 10
> > Type: SOCK_STREAM
> > Before: commit b7bfaa761d760 ("Linux 6.2-rc3")
> > 
> > Before
> > ------
> > g2h: 16.77Gb/s
> > h2g: 10.56Gb/s
> > 
> > After
> > -----
> > g2h: 21.04Gb/s
> > h2g: 10.76Gb/s
> > 
> > Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
> > 
> > ---
> > Changes in v10:
> > - vhost/vsock: use virtio_vsock_skb_dequeue()
> > - vhost/vsock: remove extra iov_length() call
> > - vhost/vsock: also consider hdr when evaluating that incoming size is
> >  valid
> > - new uperf data
> 
> Tests seem fine!
> 
> Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

Thank you for all of the reviews and testing!

Best,
Bobby