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Increased TCP errors on libvirt/virtio-net + Container Linux alpha (kernel 4.12.2) #2076

euank opened this issue Jul 25, 2017 · 3 comments


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@euank euank commented Jul 25, 2017

Issue Report


Container Linux Version

$ cat /etc/os-release 
NAME="Container Linux by CoreOS"
PRETTY_NAME="Container Linux by CoreOS 1478.0.0 (Ladybug)"


libvirt using the default network libvirt provides + the qemu image.

Expected Behavior

Downloading files from the us-east-1 s3 buckets doesn't have any significant number of tcp errors

Actual Behavior

I reliably get tcp errors and slow download speeds when compared to stable.

Other Information

I'm in the process of doing a git bisect of the kernel, we'll see what I find.

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@mer-at mer-at commented Jul 29, 2017

made the same observation, when moving one of my debian kvm guests to 4.12.4 (4.13-rc2 affected too)
absolutely sluggish nfs performance, had to revert back to 4.11

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Contributor Author

@euank euank commented Jul 29, 2017

I've bisected it to torvalds/linux@680557c

There's an ongoing thread on netdev which matches what I'm seeing as well:

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@euank euank commented Jul 31, 2017

Per above we've applied a patch to our kernel which resolves this issue. It should be fixed in the upcoming alpha release.

@euank euank closed this Jul 31, 2017
ChrisMcKenzie added a commit to ChrisMcKenzie/coreos-overlay that referenced this issue Dec 9, 2017
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