** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1682215
Title:
[Hyper-V] mkfs regression in kernel 4.4+
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Released
Status in linux source package in Yakkety:
Fix Released
Bug description:
Related bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1657539
This issue was fixed in Zesty, but also impacts the Xenial and Yakkety
kernels. Can you please pull this patch back to Xenial+?
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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