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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1657539
Title:
[Hyper-V] mkfs regression in 4.10 fixed by patch in "for-4.11"
Status in linux package in Ubuntu:
Confirmed
Bug description:
Linux-next testing with upstream identified a regression with mkfs
operations based on an uptream patch accepted into Linus's tree.
Please consider this commit that corrects the regression:
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-
block.git/commit/?h=for-4.11/block&id=729204ef49ec00b788ce23deb9eb922a5769f55d
author
Ming Lei <ming....@canonical.com>
2016-12-17 10:49:09 (GMT)
committer
Jens Axboe <ax...@fb.com>
2017-01-12 03:47:08 (GMT)
commit
729204ef49ec00b788ce23deb9eb922a5769f55d (patch)
tree
ab5cc3c0aa17fa8b988ed7dfefe888000fac0be3
parent
1661f2e21c8bbf922dcb76faf2126a33ffe4cddb (diff)
block: relax check on sg gap
If the last bvec of the 1st bio and the 1st bvec of the next
bio are physically contigious, and the latter can be merged
to last segment of the 1st bio, we should think they don't
violate sg gap(or virt boundary) limit.
Both Vitaly and Dexuan reported lots of unmergeable small bios
are observed when running mkfs on Hyper-V virtual storage, and
performance becomes quite low. This patch fixes that performance
issue.
The same issue should exist on NVMe, since it sets virt boundary too.
Reported-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Reported-by: Dexuan Cui <de...@microsoft.com>
Tested-by: Dexuan Cui <de...@microsoft.com>
Cc: Keith Busch <keith.bu...@intel.com>
Signed-off-by: Ming Lei <ming....@canonical.com>
Signed-off-by: Jens Axboe <ax...@fb.com>
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