From: bugzilla-daemon@bugzilla.kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter
Date: Fri, 19 Mar 2021 20:43:19 +0000 [thread overview]
Message-ID: <bug-201753-28872-UhhJcL5Nis@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-201753-28872@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=201753
--- Comment #32 from David Coe (david.coe@live.co.uk) ---
I'm pretty sure this is because IOMMU (for some Ryzens) unlatches after 5 tries
on cold boot and 6 tries on warm. Suravee, alas, has set his patch at 5 x 20
msecs just on the 'dither' point!
Some time mid-next week I'll lay my sticky hands on a 4700U laptop. I have
images re-compiled for Ubuntu's kernel 5.8.0-45 (20.10) and 5.11.0-11 (21.04)
patched at 25 x 20 msecs and logged. Ditto with Alex's oh-so-simple patch.
If all goes well(!), I'll draw up a nice, comparative table of mine and
everybody else's data so we can draw some conclusions. If you scan the
Debian/Ubuntu kernel changelog, you'll find a long list of 'cherry-picked'
patches for both AMD and Intel for IOMMU. It is very much a work-in-progress
still!
Best regards and many thanks all for input.
David
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next prev parent reply other threads:[~2021-03-19 20:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-201753-28872@https.bugzilla.kernel.org/>
2020-03-27 20:58 ` [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter bugzilla-daemon
2020-03-27 21:06 ` bugzilla-daemon
2021-02-02 1:33 ` bugzilla-daemon
2021-02-06 3:42 ` bugzilla-daemon
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2021-03-19 20:43 ` bugzilla-daemon [this message]
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