This bug was fixed in the package linux-azure - 4.15.0-1045.49~14.04.1
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linux-azure (4.15.0-1045.49~14.04.1) trusty; urgency=medium
[ Ubuntu: 4.15.0-1045.49 ]
* [linux-azure] Storage performance drop on RAID (LP: #1828248)
- Revert "blk-mq: remove the request_list usage"
This bug was fixed in the package linux-azure - 4.15.0-1045.49
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linux-azure (4.15.0-1045.49) xenial; urgency=medium
* [linux-azure] Storage performance drop on RAID (LP: #1828248)
- Revert "blk-mq: remove the request_list usage"
[ Ubuntu: 4.15.0-50.54 ]
*
Yes, that is correct. Comment #6. Sorry for the typo.
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Title:
[linux-azure] Storage performance drop on RAID
Status in
Morning Joe,
On 5/14/19 8:40 AM, Joseph Salisbury wrote:
> @marcelo, we do want the changes requested in comment #5 in bug 1819689.
> We can wait for the results of Long Li's investigation before proceeding
> there.
>
that is the revert in comment #6, right?
Terry
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Thanks for the feedback, @jsalisbury.
So we are proceeding with the revert for now. Later when Long Li's
investigation is ready, can you open a new bug listing the remaining
commits that need to be included?
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@marcelo, we do want the changes requested in comment #5 in bug 1819689.
We can wait for the results of Long Li's investigation before proceeding
there.
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@longli I would like your assessment of the changes that we've made here
to get back to expected performance. I know we are not getting the same
results on NVMe devices with 16.04 and 18.04 and I'm wondering if
there's something substantially different with the 4.15 kernel in use on
16.04 that
This patch was intended to increase performance, not reduce it. Is it
too late to revert it?
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Title:
[linux-azure] Storage
** Tags added: patch
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Title:
[linux-azure] Storage performance drop on RAID
Status in linux-azure package in Ubuntu:
New
Hi, Joe. Do you think the revert is enough for now, or should we discuss
about eventyually including the changes that you had mentioned on the
comment #5 in the bug #1819689?
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Exactly, Joseph. I'm attaching the exact patch I used for building the
test kernel.
** Patch added: "0001-Revert-blk-mq-remove-the-request_list-usage.patch"
@Marcelo Cerri, just to confirm, the test kernel posted in comment #6
only had commit 7ac257b862f2c reverted?
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Title:
** Also affects: linux-azure (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux-azure (Ubuntu Xenial)
Status: New => Fix Committed
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The test kernel is reaching 52K IOPS as expected.
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Title:
[linux-azure] Storage performance drop on RAID
Status in
I built a test kernel reverting the commit that Joe has mention:
https://kernel.ubuntu.com/~mhcerri/azure/xenial-linux-
azure-4.15.0-1044.48+1828248/
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VM size is Standard_DS14_v2
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Title:
[linux-azure] Storage performance drop on RAID
Status in linux-azure package in Ubuntu:
Adrian, can you add the VM size here, they are trying to reproduce.
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Title:
[linux-azure] Storage performance drop on RAID
This commit was also added to the Ubuntu-azure-4.18.0-1017 kernel. Are
we seeing expected performing with that kernel?
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Title:
The bug number from comment one should have been bug 1819689
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Title:
[linux-azure] Storage performance drop on RAID
Status
The following commit was added in bug fa55b5d226dd.
7ac257b862f2c (“blk-mq: remove the request_list usage”)
This commit cleans up unused code in block-mq (mq uses pre-allocated
tags to allocate request, not request_list as it's used only in legacy
queue).
A test kernel with a revert of this
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