From: bugzilla-daemon@bugzilla.kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter
Date: Tue, 16 Mar 2021 11:14:26 +0000 [thread overview]
Message-ID: <bug-201753-28872-RyHSaT6OKM@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 #23 from David Coe (david.coe@live.co.uk) ---
I would guess that the difference between warm and cold boot is due to your
Ryzen 2500U (like my 2440G) hovering between needing 5 and 6 tries of 20 msecs.
Without adding Paul's logging you can't tell!
If it would help anyone (and you trust a non-official kernel recompile) I have
placed 4 variants on my Box account. Both Suravee's original patch with 25 x 20
msec tries maximum and logged and Alex's very simple patch are applied to
Ubuntu's 5.8.0-44 (20.10) and 5.10.0-14 (21.04) kernels.
The version numbers are identical so that Ubuntu's own DEB's for linux-tools,
linux-headers and linux-libc-dev are compatible. My linux-image replaces their
own linux-image and linux-modules so take care that you can still boot from a
'known' kernel.
They all work for me with quite heavy use on KVM but YMMV :-). Mail me if you
need access.
Best regards to all and my thanks to Suravee, Alex and Paul!
David
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next prev parent reply other threads:[~2021-03-16 11:15 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
2021-02-06 4:01 ` bugzilla-daemon
2021-02-10 19:52 ` bugzilla-daemon
2021-02-10 19:54 ` bugzilla-daemon
2021-02-11 18:03 ` bugzilla-daemon
2021-02-24 20:32 ` bugzilla-daemon
2021-02-25 17:54 ` bugzilla-daemon
2021-02-26 11:58 ` bugzilla-daemon
2021-02-26 13:28 ` bugzilla-daemon
2021-02-26 21:17 ` bugzilla-daemon
2021-02-27 15:21 ` bugzilla-daemon
2021-02-28 20:04 ` bugzilla-daemon
2021-03-03 18:24 ` bugzilla-daemon
2021-03-05 10:26 ` bugzilla-daemon
2021-03-08 10:46 ` bugzilla-daemon
2021-03-15 22:00 ` bugzilla-daemon
2021-03-16 11:14 ` bugzilla-daemon [this message]
2021-03-17 10:32 ` bugzilla-daemon
2021-03-18 1:22 ` bugzilla-daemon
2021-03-18 8:41 ` bugzilla-daemon
2021-03-18 16:41 ` bugzilla-daemon
2021-03-19 9:13 ` bugzilla-daemon
2021-03-19 9:56 ` bugzilla-daemon
2021-03-19 16:37 ` bugzilla-daemon
2021-03-19 20:43 ` bugzilla-daemon
2021-03-25 21:51 ` bugzilla-daemon
2021-08-26 8:42 ` bugzilla-daemon
2021-08-26 8:43 ` bugzilla-daemon
2021-10-01 19:54 ` bugzilla-daemon
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