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

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euank opened this Issue Jul 25, 2017 · 3 comments

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euank commented Jul 25, 2017

Issue Report

Bug

Container Linux Version

$ cat /etc/os-release 
NAME="Container Linux by CoreOS"
ID=coreos
VERSION=1478.0.0
VERSION_ID=1478.0.0
BUILD_ID=2017-07-19-0038
PRETTY_NAME="Container Linux by CoreOS 1478.0.0 (Ladybug)"
ANSI_COLOR="38;5;75"
HOME_URL="https://coreos.com/"
BUG_REPORT_URL="https://issues.coreos.com"
COREOS_BOARD="amd64-usr"

Environment

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 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

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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euank Jul 29, 2017

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

There's an ongoing thread on netdev which matches what I'm seeing as well: https://www.spinics.net/lists/netdev/msg446206.html

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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: https://www.spinics.net/lists/netdev/msg446206.html

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euank Jul 31, 2017

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

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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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