Date: Sat, 13 Jul 2013 19:29:36 +0200 From: Ian FREISLICH <ianf@cloudseed.co.za> To: Konstantin Belousov <kostikbel@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Filesystem wedges caused by r251446 Message-ID: <E1Uy3dY-0003tu-En@clue.co.za> In-Reply-To: <20130713164814.GM91021@kib.kiev.ua> References: <20130713164814.GM91021@kib.kiev.ua> <20130713054220.GJ91021@kib.kiev.ua> <20130712201051.GI91021@kib.kiev.ua> <201307110923.06548.jhb@freebsd.org> <201307091202.24493.jhb@freebsd.org> <E1UufRq-0001sg-HG@clue.co.za> <E1UxEWB-0000il-21@clue.co.za> <E1Uxhoe-0000d9-Sc@clue.co.za> <E1Uxkyo-0002mE-MJ@clue.co.za> <E1Uxuy4-0003KB-OZ@clue.co.za> <E1Uy2r2-0003r7-0x@clue.co.za>
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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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