On Mon, Jun 13, 2016 at 03:51:19PM +0200, Tomasz Majchrzak wrote:
> A performance drop of mkfs has been observed on RAID10 during resync
> since commit 09314799e4f0 ("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.
Applied, thanks!
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