Hi all!
On 04/05/2021 07:52, Suravee Suthikulpanit wrote:
On certain AMD platforms, when the IOMMU performance counter source
(csource) field is zero, power-gating for the counter is enabled, which
prevents write access and returns zero for read access.
This can cause invalid perf result especi
Hi, once more!
On 04/05/2021 07:52, Suravee Suthikulpanit wrote:
On certain AMD platforms, when the IOMMU performance counter source
(csource) field is zero, power-gating for the counter is enabled, which
prevents write access and returns zero for read access.
This can cause invalid perf result
Hi again!
On 04/05/2021 07:52, Suravee Suthikulpanit wrote:
On certain AMD platforms, when the IOMMU performance counter source
(csource) field is zero, power-gating for the counter is enabled, which
prevents write access and returns zero for read access.
This can cause invalid perf result espe
Hi Suravee!
Results for Ryzen 2400G on Ubuntu 20.10, kernel 5.8.0-50 with patch 2/2
alone. Events batched 3 x 8 to avoid counter-multiplexing (?) artefacts.
On 15/04/2021 10:28, Suthikulpanit, Suravee wrote:
David,
For the Ryzen 2400G, could you please try with:
- 1 event at a time
- Not mor
Hi Suravee!
On 15/04/2021 10:28, Suthikulpanit, Suravee wrote:
David,
On 4/14/2021 10:33 PM, David Coe wrote:
Hi Suravee!
I've re-run your revert+update patch on Ubuntu's latest kernel
5.11.0-14 partly to check my mailer's 'mangling' hadn't also reached
t
I think you've put your finger on it, Suravee!
On 15/04/2021 10:28, Suthikulpanit, Suravee wrote:
David,
On 4/14/2021 10:33 PM, David Coe wrote:
Hi Suravee!
I've re-run your revert+update patch on Ubuntu's latest kernel
5.11.0-14 partly to check my mailer's 'mang
Hi again!
For completeness, I'm attaching results for the revert+update patch
running the Ubuntu 21.04β kernel 5.11.0-14 on a Ryzen 4700U laptop.
The enormous amd_iommu running stats aren't always there, as they nearly
always are on the the 2400G desktop, but they do turn up (depending on
wh
Hi Suravee!
I've re-run your revert+update patch on Ubuntu's latest kernel 5.11.0-14
partly to check my mailer's 'mangling' hadn't also reached the code!
There are 3 sets of results in the attachment, all for the Ryzen 2400G.
The as-distributed kernel already incorporates your IOMMU RFCv3 pat
es/:01:00.1
/sys/kernel/iommu_groups/15/devices/:01:00.0
/sys/kernel/iommu_groups/7/devices/:00:13.0
/sys/kernel/iommu_groups/7/devices/:00:13.2
/sys/kernel/iommu_groups/17/devices/:04:00.0
$ sudo kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used
$ perf list | grep iommu
No amd_iommu events
Best regards and many thanks.
--
David Coe
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m_dte_mis on the older Ryzen 2400G. Will do some RTFM but anyone
with comments and insight?
841,689,151,202,939 amd_iommu_0/mem_dte_mis/ (33.44%)
Otherwise, all seems to running smoothly (especially for a distribution
still in β). Bravo and many thanks all!
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_inv/ (33.28%)
0 amd_iommu_0/vapic_int_guest/ (33.28%)
345 amd_iommu_0/vapic_int_non_guest/ (33.29%)
10.000799128 seconds time elapsed
Results for Ryzen 7 4700U to follow.
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David Coe
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rnel.org/linux-iommu/alpine.lnx.3.20.13.2006030935570.3...@monopod.intra.ispras.ru/
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=201753
Cc: Tj (Elloe Linux)
Cc: Shuah Khan
Cc: Alexander Monakov
Cc: David Coe
Cc: Paul Menzel
Signed-off-by: Suravee Suthikulpanit
---
drivers/i
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