linux-kernel - Re: [PATCH RFC 0/4] vsock/virtio: optimizations to increase the throughput

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Date:   Mon, 8 Apr 2019 10:44:16 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Stefano Garzarella <sgarzare@...hat.com>, netdev@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH RFC 0/4] vsock/virtio: optimizations to increase the
 throughput

On Mon, Apr 08, 2019 at 02:43:28PM +0800, Jason Wang wrote:
> Another thing that may help is to implement sendpage(), which will greatly
> improve the performance.

I can't find documentation for ->sendpage().  Is the idea that you get a
struct page for the payload and can do zero-copy tx?  (And can userspace
still write to the page, invalidating checksums in the header?)

Stefan

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