** Changed in: ubuntu-power-systems
Status: Fix Committed => Fix Released
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Title:
Improve NVMe guest performance on Bionic QEMU
To manage
This bug was fixed in the package qemu - 1:2.11+dfsg-1ubuntu7.21
---
qemu (1:2.11+dfsg-1ubuntu7.21) bionic; urgency=medium
* d/p/lp-1842774-s390x-cpumodel-Add-the-z15-name-to-the-description-o.patch:
update the z15 model name (LP: #1842774)
* d/p/u/lp-1847948-*: allow MSIX BAR
Thanks for the verification Murillo.
I updated the tags based on comment #25.
** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic
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I found no obvious regressions with this build in a run of our usual set
of tests.
@IBM - for SRu verification - can you give the actual testcase it was
intended for a shot in your environment as you had that set up int he
past?
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** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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Title:
Improve NVMe guest performance on Bionic QEMU
To manage
Hello bugproxy, or anyone else affected,
Accepted qemu into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-
1ubuntu7.21 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
htt
This got surpassed by a security upload while waiting for SRU Team.
I have uploaded rebased versions to -unapproved.
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Title:
Improve NVMe guest p
** Changed in: ubuntu-power-systems
Status: Triaged => Fix Released
** Changed in: ubuntu-power-systems
Status: Fix Released => In Progress
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Uploaded for SRU Team review and acceptance into proposed.
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Title:
Improve NVMe guest performance on Bionic QEMU
To manage notifications about t
After reading this:
* I know, one could as well call that a "feature", but it really is a
performance bug fix more than anything else. Also the SRU policy allows
exploitation/toleration of new HW especially for LTS releases.
Therefore I think this is fine as SRU.
I'm okay with that inte
Agreed on Frank's last comment.
commit a32295c612c57990d17fb0f41e7134394b2f35f6
Author: Alexey Kardashevskiy
Date: Wed Dec 13 00:31:31 2017
vfio-pci: Allow mapping MSIX BAR
By default VFIO disables mapping of MSIX BAR to the userspace as
the userspace may program it in a way a
Regarding the kernel part of this LP ticket I plan to set it to Won't Fix - if
nobody objects.
And that's because we usually do not add performance improvements to stable
kernels, but have the hardware enablement (HWE) kernel instead.
I checked disco's git tree and "vfio-pci: Allow mapping MSIX
I opened up the MP for review again after pushing the extra patches that you
tested.
Once that is done I can push it to the SRU teams queue ...
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T
Thanks Murilo, I need no test with the basic kernel yet.
But later when we really SRU this it will be good to do both a old and a HWE
kernel check.
Let me add that to the verification steps ...
** Description changed:
[Impact]
- * In the past qemu has generally not allowd MSI-X BAR mapping
Thanks for your feedback and tests Murilo*2 (There seems to be a team of
Murilo's on this :-) - thanks for your efforts and fast responses
bringing this case forward.)
With the main changes requested I really think we need the patch in #8
to avoid issues on other HW setups that due to the new code
Christian,
Patch from comment 8 seems yet another nice improvement. We haven't
tried it to have a strong opinion.
If it's included, then I think patch from comment 9 won't hurt being
added too.
Murilo
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Christian,
Using QEMU from comment 6, it improved the performance for numjobs=4 and
numjobs=64 cases, respectively:
READ: bw=1140MiB/s (1195MB/s), 271MiB/s-302MiB/s (284MB/s-317MB/s),
io=66.8GiB (71.7GB), run=60001-60001msec
READ: bw=4271MiB/s (4479MB/s), 30.1MiB/s-82.6MiB/s (31.6MB/s-86.6
And on top of the former question most likely then also [1].
[1]:
https://git.qemu.org/?p=qemu.git;a=commit;h=5c08600547c059e3fd072995f9f367cdaf3c7d9d
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@Murilo: I was wondering - I think we might want/need also [1] to not
run into fatal false positives. What is your opinion on this?
[1]:
https://git.qemu.org/?p=qemu.git;a=commit;h=567b5b309abe744b1098018a2eb157e7109c9f30
** Description changed:
+ [Impact]
+
+ * In the past qemu has generally
All systems I could easily get a hold of already had their NVME drives
in use so I couldn't pass them through easily. Therefore I'd like to
come back to your offer to check the test build.
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** Merge proposal linked:
https://code.launchpad.net/~paelzer/ubuntu/+source/qemu/+git/qemu/+merge/374130
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Title:
Improve NVMe guest performa
FYI: Test builds are in [1]. It isn't required, but would be great if
you could give it a check as well ahead of the actual SRU.
[1]:
https://launchpad.net/~paelzer/+archive/ubuntu/bug-1847948-nvmeperf-1842774
-z15name-bionic
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I must have been blind, of course your testcase in the description is
fine. Sorry for even asking.
I'll give it a try if it also works to reflect the improvement on some
HW I can access, but if not thanks for offer to test it on your side.
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Christian,
The test case for this is to:
- passthrough the NVMe disk to guest;
- and run fio benchmarks against the passed-through NVMe disk in the guest.
I have detailed these steps and pasted the commands in the bug
description. Please let me know if steps are not clear.
The only required HW
The kernel part of this is in since 4.16 so it either needs a HWE kernel
or to add a kernel Task to backport the related change for the kernel as
well. I'll add a task but it depends the Kernelteam (doability) and the
reporters request (for which kernel it is needed).
** Also affects: linux (Ubunt
FYI kernel commit is [1] I haven't checked if any context is needed.
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1847948
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Title:
Improve
For Qemu the code is in 2.12, therefore as requested we only need to
consider Bionic.
@Murilo: do you have a good testcase for this to verify the bug when it became
an accepted SRU?
Could you outline what has to be done and if it requires special HW or a rather
complex setup maybe even commit to
** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Status: New => Triaged
** Changed in: ubuntu-power-systems
Importance: Undecided => Medium
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical
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