Date: Sun, 25 Sep 2005 11:40:14 +0200 From: Bohdan Horst <nexus@hoth.amu.edu.pl> To: Mark Kirkwood <markir@paradise.net.nz> Cc: Chris <chrcoluk@gmail.com>, freebsd-stable@freebsd.org Subject: Re: FreeBSD IO Performance (was Re: Quality of FreeBSD) Message-ID: <20050925094014.GA713@aristo> In-Reply-To: <20050725160021.GB613@aristo> References: <1dbad31505072105401c06bee6@mail.gmail.com> <42E099A0.3080101@paradise.net.nz> <3aaaa3a050724144831d5cff0@mail.gmail.com> <42E4BBCD.3060406@paradise.net.nz> <20050725160021.GB613@aristo>
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On Mon, Jul 25, 2005 at 06:00:21PM +0200, Bohdan Horst wrote: > On Mon, Jul 25, 2005 at 10:15:41PM +1200, Mark Kirkwood wrote: > > Hmm - looks like I missed that thread, never mind - repeatability of > > findings is sound scientific principle :-) > > > > With respect to changing the default for vfs.read_max - makes sense to > > me, but it would be interesting to know if anyone has a system that > > performs *worse* with it set to 16. > > > > regards > > > > Mark > > > > Chris wrote: > > >Its been mentioned before and most experience the same as you by > > >setting it to 16 a dramatic improvement in the sequential read, I > > >currently run all my 5.x servers like this with no issues as a result. > > > I am curious if the default will ever be changed. > > on my notebook: > IBM TP 600x > 5.4-RELEASE-p4 > ad0: 38154MB <IC25N040ATCS04-0/CA4OA71A> [77520/16/63] at ata0-master UDMA33 > APM enable (but same effect with disable APM) > AAC unfortunatelly not supported :( > > > anything above vfs.read_max=1 produce very annoying little sound (i can > hear disk heads) when playing movies.. new notebook, new results: Toshiba 1410-614 5.4-RELEASE-p7 atapci0: <Intel ICH3 UDMA100 controller> ad0: 38154MB <WDC WD400VE-75HDT0/09.07D09> [77520/16/63] at ata0-master UDMA100 anything above vfs.read_max=1 produce sometimes very annoying little image glitch/freeze (synchronized with hdd led) when playing movies... (with AAC disk is now silent:) regards -- Bohdan 'Nexus' Horst
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