Filesystem wedges caused by r251446
Ian FREISLICH
ianf at cloudseed.co.za
Sat Jul 13 17:29:41 UTC 2013
Konstantin Belousov wrote:
> > So, then did r251446 actually start using this value or did other
> > values get significantly tuned up? I recall now setting this nearly
> > a year ago when we did our ZFS tuning and it was a four fold increase
> > on the defaults.
>
> r251446 optimized the wakeups by only doing wakeups when runningbufspace
> actually crossed the lorunningspace. Before, wakeups were performed
> always on the runningbufspace changes.
>
> For ZFS, these settings are completely irrelevant, ZFS does not use
> buffer cache.
A year is so long ago... It might have been tuning for our postgres
servers.
It might be worth while putting in a sanity check that doesn't allow
hirunningspace to be set lower than lorunningspace.
Thanks for your patience.
Ian
--
Ian Freislich
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