David / Joerg,
On 4/10/2021 5:03 PM, David Coe wrote:
>
> The immediately obvious difference is the with the enormous count seen on
> mem_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/
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 the code!
>
> There are 3 sets of results in the attachment, all for the Ryzen 2400G. The
> as-
On 4/10/2021 5:03 PM, David Coe wrote:
> Results for AMD Ryzen 4700U running Ubuntu 21.04β kernel 5.11.0-13
>
> $ sudo dmesg | grep IOMMU
> [ 0.490352] pci :00:00.2: AMD-Vi: IOMMU performance counters supported
> [ 0.491985] pci :00:00.2: AMD-Vi: Found IOMMU cap 0x40
> [ 0.493732]
I have a couple questions here:
1) Are you running in some sort of virtual machine? Looking at the old
log files you sent along in the "var log.zip", it seems like you are
running virtual box.
2) How are you setting up your system?
3) How are you setting up your zfs? Are you using the zfs-fuse
Actually, the patch should not have affected the IOMMU performance. I'm
not quite familiar with ZFS. If you give me some pointers of how you do
your testing, I can try to experiment. Could you recheck the dmesg to
see if there are other issues?
--
You received this bug notification because you
I have recently submitted a patch (http://marc.info/?l=linux-
kernel&m=135905510523514&w=2) to implement workaround for an erratum
which might be related to IOMMU stop processing commands as discussed
here (http://marc.info/?l=linux-kernel&m=135867802432660&w=2). It
should be now included upstream
