Public bug reported: 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 <[email protected]> 2016-12-17 10:49:09 (GMT) committer Jens Axboe <[email protected]> 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 <[email protected]> Reported-by: Dexuan Cui <[email protected]> Tested-by: Dexuan Cui <[email protected]> Cc: Keith Busch <[email protected]> Signed-off-by: Ming Lei <[email protected]> Signed-off-by: Jens Axboe <[email protected]> ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 <[email protected]> 2016-12-17 10:49:09 (GMT) committer Jens Axboe <[email protected]> 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 <[email protected]> Reported-by: Dexuan Cui <[email protected]> Tested-by: Dexuan Cui <[email protected]> Cc: Keith Busch <[email protected]> Signed-off-by: Ming Lei <[email protected]> Signed-off-by: Jens Axboe <[email protected]> To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1657539/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
