Re: Significantly dropped dm-cache performance in 4.13 compared to 4.11

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On Mon, Nov 13, 2017 at 8:01 PM, Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
>
> But feel free to remove the cache for now.  Should be as simple as:
> lvconvert --uncache VG/CacheLV

I did a --splitcache yesterday and ran a scrub again, which completed
in 3h. More than the ~2h of the cached version in 4.11, but
significantly less than the ~4.5h of the 4.13 cached variant. The data
on this volume has not changed much since last month, so the scrub
times should be very comparable, give or take a few minutes.

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