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Tomasz Majchrzak authored
A performance drop of mkfs has been observed on RAID10 during resync since commit 09314799 ("md: remove 'go_faster' option from ->sync_request()"). Resync sends so many IOs it slows down non-resync IOs significantly (few times). Add a short delay to a resync. The previous long sleep (1s) has proven unnecessary, even very short delay brings performance right. The change also applied to raid1. The problem has not been observed on raid1, however it shares barriers code with raid10 so it might be an issue for some setup too. Suggested-by: NeilBrown <neilb@suse.com> Link: http://lkml.kernel.org/r/20160609134555.GA9104@proton.igk.intel.comSigned-off-by: Tomasz Majchrzak <tomasz.majchrzak@intel.com> Signed-off-by: Shaohua Li <shli@fb.com>
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