netdev - Re: [PATCH v4] virtio/vsock: replace virtio_vsock_pkt with sk

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Date:   Thu, 24 Nov 2022 16:28:30 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <oxffffaa@...il.com>
Cc:     Bobby Eshleman <bobby.eshleman@...edance.com>,
        Bobby Eshleman <bobbyeshleman@...il.com>,
        Cong Wang <cong.wang@...edance.com>,
        Jiang Wang <jiang.wang@...edance.com>,
        Stefan Hajnoczi <stefanha@...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>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, AVKrasnov@...rdevices.ru
Subject: Re: [PATCH v4] virtio/vsock: replace virtio_vsock_pkt with sk_buff

On Thu, Nov 24, 2022 at 06:13:49PM +0300, Arseniy Krasnov wrote:
>Hello Stefano
>
>On 24.11.2022 18:00, Stefano Garzarella wrote:
>> This is a net-next material, please remember to use net-next tag:
>> https://www.kernel.org/doc/html/v6.0/process/maintainer-netdev.html#netdev-faq
>>
>> On Wed, Nov 23, 2022 at 10:07:49PM -0800, 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/Config: uperf w/ 64 threads, SOCK_STREAM
>>> Test Runs: 5, mean of results
>>> Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
>>>
>>> Test: 64KB, g2h
>>> Before: 21.63 Gb/s
>>> After: 25.59 Gb/s (+18%)
>>>
>>> Test: 16B, g2h
>>> Before: 11.86 Mb/s
>>> After: 17.41 Mb/s (+46%)
>>>
>>> Test: 64KB, h2g
>>> Before: 2.15 Gb/s
>>> After: 3.6 Gb/s (+67%)
>>>
>>> Test: 16B, h2g
>>> Before: 14.38 Mb/s
>>> After: 18.43 Mb/s (+28%)
>>>
>>> Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
>>> ---
>>
>> The patch LGTM. I run several tests (iperf3, vsock_test,
>> vsock_diag_test, vhost-user-vsock, tcpdump) and IMO we are okay.
>>
>> I found the following problems that I would like to report:
>>
>> - vhost-user-vsock [1] is failing, but it is not an issue of this patch,
>>   but a spec violation in the rust-vmm/vm-virtio/virtio-vsock crate as I
>>   reported here [2]. We will fix it there, this patch is fine, indeed
>>   trying a guest with the new layout (1 descriptor for both header and
>>   data) with vhost-vsock in Linux 6.0, everything works perfectly.
>>
>> - the new "SOCK_SEQPACKET msg bounds" [3] reworked by Arseniy fails
>>   intermittently with this patch.
>>
>>   Using the tests currently in the kernel tree everything is fine, so
>>   I don't understand if it's a problem in the new test or in this
>>   patch. I've looked at the code again and don't seem to see any
>>   criticisms.
>>
>>   @Arseniy @Bobby can you take a look?
>Seems i've found this problem here:
>
>https://lkml.org/lkml/2022/11/24/708
>
>Being fixed - all tests passes

Good catch!

Thanks,
Stefano