[Bug 219129] New: virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[Bug 219129] New: virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

            Bug ID: 219129
           Summary: virtio net performance degradation between Windows and
                    Linux guest in kernel 6.10.3
           Product: Virtualization
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: anton.wd@gmail.com
        Regression: No

After kernel upgrade from 6.10.2 to 6.10.3 network performance has become very
low between Windows and Linux guest.

Steps to reproduce:
MTU 9000 for all adapters and bridge (Jumbo frame 9014 in Windows)
KVM host, qemu 9.0.2, bridge (e.g. br0)
Linux guest, virtio net adapter bridged to host br0, address e.g. 192.168.0.1
Windows 11 guest, virtio net adapter, bridged to host br0, address e.g.
192.168.0.2

When accessing Linux guest from Windows 11 and if kvm host OR Linux guest has
kernel version 6.10.3 then network performance is poor.

iperf3 for example:

$ iperf3.exe --client 192.168.0.1
Connecting to host 192.168.0.1, port 5201
[  5] local 192.168.0.2 port 49849 connected to 192.168.0.1 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec   256 KBytes  2.08 Mbits/sec
[  5]   1.01-2.01   sec   128 KBytes  1.04 Mbits/sec
[  5]   2.01-3.01   sec  0.00 Bytes  0.00 bits/sec
[  5]   3.01-4.01   sec   128 KBytes  1.05 Mbits/sec
[  5]   4.01-5.00   sec  0.00 Bytes  0.00 bits/sec
[  5]   5.00-6.01   sec  0.00 Bytes  0.00 bits/sec
[  5]   6.01-7.01   sec  0.00 Bytes  0.00 bits/sec
[  5]   7.01-8.01   sec   128 KBytes  1.05 Mbits/sec
[  5]   8.01-9.01   sec  0.00 Bytes  0.00 bits/sec
[  5]   9.01-10.01  sec  0.00 Bytes  0.00 bits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec   640 KBytes   524 Kbits/sec                  sender
[  5]   0.00-10.02  sec   384 KBytes   314 Kbits/sec                  receiver

iperf Done.


If kvm host AND Linux guest has kernel version 6.10.2 then performance seems ok

$ iperf3.exe --client 192.168.0.1
Connecting to host 192.168.0.1, port 5201
[  5] local 192.168.0.2 port 50092 connected to 192.168.0.1 port 5201
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.01   sec  3.86 GBytes  33.0 Gbits/sec
[  5]   1.01-2.01   sec  3.78 GBytes  32.4 Gbits/sec
[  5]   2.01-3.02   sec  3.72 GBytes  31.6 Gbits/sec
[  5]   3.02-4.01   sec  3.75 GBytes  32.2 Gbits/sec
[  5]   4.01-5.01   sec  3.80 GBytes  32.8 Gbits/sec
[  5]   5.01-6.01   sec  3.64 GBytes  31.3 Gbits/sec
[  5]   6.01-7.01   sec  3.90 GBytes  33.6 Gbits/sec
[  5]   7.01-8.00   sec  3.94 GBytes  33.9 Gbits/sec
[  5]   8.00-9.00   sec  3.83 GBytes  32.9 Gbits/sec
[  5]   9.00-10.00  sec  3.87 GBytes  33.3 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec  38.1 GBytes  32.7 Gbits/sec                  sender
[  5]   0.00-10.01  sec  38.1 GBytes  32.7 Gbits/sec                  receiver

iperf Done.

The following entries appear in the kernel logs on Linux guest:
[  157.294081] enp3s0: bad gso: type: 1, size: 8960
[  157.294298] enp3s0: bad gso: type: 1, size: 8960
[  157.623938] enp3s0: bad gso: type: 1, size: 8960
[  157.938094] enp3s0: bad gso: type: 1, size: 8960
[  158.249957] enp3s0: bad gso: type: 1, size: 8960
[  158.593349] enp3s0: bad gso: type: 1, size: 8960
[  158.909346] enp3s0: bad gso: type: 1, size: 8960
[  159.236646] enp3s0: bad gso: type: 1, size: 8960
[  159.236721] enp3s0: bad gso: type: 1, size: 8960
[  159.236745] enp3s0: bad gso: type: 1, size: 8960

This is also reproduced for bare metal Windows 11 PC with bridged physical
network adapter to br0 on kvm host.

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

James Tucker (jftucker@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jftucker@gmail.com

--- Comment #1 from James Tucker (jftucker@gmail.com) ---
Likely caused by e269d79c7d35aa3808b1f3c1737d63dab504ddc8, fixed by
89add40066f9ed9abe5f7f886fe5789ff7e0c50e

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #2 from Thomas Clark (kernel@clark.bz) ---
Any idea when this fix will show up in a released kernel?

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #3 from Christian Heusel (christian@heusel.eu) ---
No that is not yet clear, but I have proposed it's inclusion to the stable
kernels a few days ago:
https://lore.kernel.org/all/60bc20c5-7512-44f7-88cb-abc540437ae1@heusel.eu

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #4 from alexucu@gmail.com ---
This doesn't seem to be fixed in 6.10.4 just yet, at least on Arch's default
kernel variant.

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #5 from Christian Heusel (christian@heusel.eu) ---
Yes this is expected as the patch has not yet been included in the stable
series 😅
I'll wait for a bit and poke the thread again.

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #6 from Jordan Whited (jordan@jordanwhited.com) ---
https://github.com/jwhited/tun-einval-repro/blob/main/main.go contains a
simplified reproduction of the issue. This writes a GSO_TCPv4 packet to a TUN
device w/GSO=1240 and 2 equal length segments. The write returns EINVAL with
e269d79c7d35aa3808b1f3c1737d63dab504ddc8 absent the fix in
89add40066f9ed9abe5f7f886fe5789ff7e0c50e.

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #7 from Christian Heusel (christian@heusel.eu) ---
The patch made it to the 6.10 and 6.6 stable queues :)

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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https://bugzilla.kernel.org/show_bug.cgi?id=219129

--- Comment #8 from Thomas Clark (kernel@clark.bz) ---
Thank you!

On 8/14/24 03:24, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=219129
>
> --- Comment #7 from Christian Heusel (christian@heusel.eu) ---
> The patch made it to the 6.10 and 6.6 stable queues :)
>

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=219129

Raymond Jay Golo (rjgolo@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rjgolo@gmail.com

--- Comment #9 from Raymond Jay Golo (rjgolo@gmail.com) ---
I can confirm that performance has been restored with 6.10.5 on my Linode
instance. I was wondering why it was suddenly failing to connect to update
servers due to extremely slow downloads or timeouts and now everything is OK.

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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https://bugzilla.kernel.org/show_bug.cgi?id=219129

Salvatore Bonaccorso (carnil@debian.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |carnil@debian.org

--- Comment #10 from Salvatore Bonaccorso (carnil@debian.org) ---
Report on the regressions list:
https://lore.kernel.org/regressions/ZsyMzW-4ee_U8NoX@eldamar.lan/T/#m390d6ef7b733149949fb329ae1abffec5cefb99b

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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--- Comment #11 from Salvatore Bonaccorso (carnil@debian.org) ---
And a downstream report in Debian: https://bugs.debian.org/1079684

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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--- Comment #12 from Christian Heusel (christian@heusel.eu) ---
Fix is queued up for 6.1 now aswell, thanks @carnil!

https://lore.kernel.org/all/2024082741-crease-mug-f658@gregkh

https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-6.1/net-drop-bad-gso-csum_start-and-offset-in-virtio_net_hdr.patch

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[Bug 219129] virtio net performance degradation between Windows and Linux guest in kernel 6.10.3

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Karl Tischler (info@it-connect-unix.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |info@it-connect-unix.de

--- Comment #13 from Karl Tischler (info@it-connect-unix.de) ---
The degraded network performance also seems to be a problem in kernel 5.15.165.
Should I file a new bug report?

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