From: bugzilla-daemon@kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 199727] CPU freezes in KVM guests during high IO load on host
Date: Thu, 10 Feb 2022 13:22:52 +0000 [thread overview]
Message-ID: <bug-199727-28872-cr4SPwShq7@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-199727-28872@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=199727
--- Comment #7 from Yann Papouin (yann.papouin@gmail.com) ---
(In reply to Roland Kletzing from comment #5)
> apparently, things got even worse with proxmox 7, as it seems it's using
> async io (via io_uring) by default for all virtual disk IO, i.e. the
> workaround "cache=writeback" does not work for me anymore.
>
> if i set aio=threads by directly editing VM configuration, things run
> smoothly again.
Are you using "cache=writeback" with "aio=threads" ?
For me, using "aio=threads" reduces the VM freeze (High CPU Load) but it still
happens on high disk IO (backup/disk move)
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next prev parent reply other threads:[~2022-02-10 13:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-199727-28872@https.bugzilla.kernel.org/>
2021-08-20 17:25 ` [Bug 199727] CPU freezes in KVM guests during high IO load on host bugzilla-daemon
2021-08-21 8:53 ` bugzilla-daemon
2021-08-22 12:11 ` bugzilla-daemon
2021-08-29 14:58 ` bugzilla-daemon
2022-01-13 12:09 ` bugzilla-daemon
2022-02-10 13:22 ` bugzilla-daemon [this message]
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