netdev - RE: [PATCH net-next v4 0/3] Add support for sockmap to vsock.

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Message-ID: <6427838247d16_c503a2087e@john.notmuch>
Date:   Fri, 31 Mar 2023 18:06:10 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Bobby Eshleman <bobby.eshleman@...edance.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Bobby Eshleman <bobby.eshleman@...edance.com>
Subject: RE: [PATCH net-next v4 0/3] Add support for sockmap to vsock.

Bobby Eshleman wrote:
> We're testing usage of vsock as a way to redirect guest-local UDS
> requests to the host and this patch series greatly improves the
> performance of such a setup.
> 
> Compared to copying packets via userspace, this improves throughput by
> 121% in basic testing.
> 
> Tested as follows.
> 
> Setup: guest unix dgram sender -> guest vsock redirector -> host vsock
>        server
> Threads: 1
> Payload: 64k
> No sockmap:
> - 76.3 MB/s
> - The guest vsock redirector was
>   "socat VSOCK-CONNECT:2:1234 UNIX-RECV:/path/to/sock"
> Using sockmap (this patch):
> - 168.8 MB/s (+121%)
> - The guest redirector was a simple sockmap echo server,
>   redirecting unix ingress to vsock 2:1234 egress.
> - Same sender and server programs
> 
> *Note: these numbers are from RFC v1
> 
> Only the virtio transport has been tested. The loopback transport was
> used in writing bpf/selftests, but not thoroughly tested otherwise.
> 
> This series requires the skb patch.

Appears reasonable to me although I didn't review internals of all
the af_vsock stuff. I see it got merged great.

One nit, I have a series coming shortly to pull the tests out of
the sockmap_listen and into a sockmap_vsock because I don't think they
belong in _listen but that is just a refactor.