NACK: [SRU][F/aws][PATCH 0/2] aws: proper fix for c5.18xlarge hibernation issues
Kelsey Skunberg
kelsey.skunberg at canonical.com
Wed Apr 14 18:07:18 UTC 2021
NACKing this with intention to wait for v3
-Kelsey
On 2021-03-23 17:15:24 , Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/1920944
>
> [Impact]
>
> In LP: #1918694 we applied a fix and a workaround to solve the
> hibernation issues on c5.18xlarge. The workaround was in the form of a
> SAUCE patch:
>
> "UBUNTU: SAUCE: aws: kvm: double the size of hv_clock_boot"
>
> It looks like we can replace this workaround with a proper fix, by
> applying this patch:
> https://lore.kernel.org/kvm/87sg4t7vqy.fsf@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33
>
> [Test plan]
>
> Create a c5.18xlarge instance, run the memory stress test script (the
> same test script that we are using to stress test hibernation), trigger
> the hibernate event, trigger the resume event. Repeat a couple of times
> and the problem is very likely to happen.
>
> [Fix]
>
> Replace "UBUNTU: SAUCE: aws: kvm: double the size of hv_clock_boot"
> with:
>
> https://lore.kernel.org/kvm/87sg4t7vqy.fsf@vitty.brq.redhat.com/T/#m7533e1d1e551bff425da029fd401bd87935edc33
>
> The fix has been tested extensively in the AWS infrastructure with
> positive results.
>
> [Regression potential]
>
> This new code introduced by the fix can be executed also when a CPU is
> put offline, so we may see potential regressions in the KVM CPU
> hotplugging.
>
>
> --
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