netdev - VSOCK performance

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Message-ID: <CAGxU2F6_Raw8gAW-ug1EKGKhpCnhgdbv6VQKo7E_L4zMRSEs0w@mail.gmail.com>
Date:   Tue, 29 Jan 2019 12:39:32 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     jiangyiwen@...wei.com
Cc:     Michael Tsirkin <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
        qemu devel list <qemu-devel@...gnu.org>
Subject: VSOCK performance

Hi Yiwen,
I'm currently interested on how to improve the VSOCK performance and I
read your discussions with Jason, Michael, and Stefan on both
linux-netdev and qemu-devel mailing lists.

Are you still working on it?

Reading the discussions I understood that batching can help us a lot
to increase the VSOCK performance (especially for guest->host
direction).

As a first step, I added VSOCK support to iperf3 [1] in order to
measure the current performance of VSOCK (without any modification):

              Single socket
Guest->Host        ~950MB/s
Host->Guest       ~2700MB/s

They are slightly different from your results but I think that depends
on the hardware.
My current setup is the following:
HW: Lenovo T480s (i7-8650U, DDR4 2133 Mhz)
OS (guest/host): Fedora 29 (Linux 4.20.4-200.fc29.x86_64)
Guest app: iperf3 --vsock -s
Host app:  iperf3 --vsock -c $GUEST_CID -l 64K

Just to double check these values, can you share with me the tool that you used?

Thanks,
Stefano

#1 https://github.com/esnet/iperf/pull/840

-- 
Stefano Garzarella
Software Engineer @ Red Hat