Date: Sat, 19 Jan 2008 17:51:51 +0000 From: Thomas Hurst <tom.hurst@clara.net> To: Kris Kennaway <kris@FreeBSD.org>, John Baldwin <jhb@freebsd.org>, freebsd-stable@freebsd.org, Peter Jeremy <peterjeremy@optushome.com.au> Subject: Re: Swapping caused by very large (regular) file size Message-ID: <20080119175151.GA22860@voi.aagh.net> In-Reply-To: <20080116182621.GA4260@voi.aagh.net> References: <20071203054207.GA1153@aleph.niw.com.au> <4787AAF4.1020905@FreeBSD.org> <20080112033147.GX60060@server.vk2pj.dyndns.org> <200801120005.38972.jhb@freebsd.org> <20080115020316.GA47831@voi.aagh.net> <478C7B04.9080102@FreeBSD.org> <20080116182621.GA4260@voi.aagh.net>
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* Thomas Hurst (tom.hurst@clara.net) wrote: > * Kris Kennaway (kris@FreeBSD.org) wrote: > > >> Excellent. I've been seeing this behavior for a long time, mostly on > >> backup runs (RAID-1 amr SATA -> 1 disk Marvell ata). It's pretty odd > >> seeing a system with 8G of memory, 60% of which is just cache, swap > >> out half a dozen things for no apparant reason. And to think, people > >> on FreeNode ##freebsd just insisted I had a misconfigured system ;) > > 7 does indeed seem to resolve this. Also, no sign of corruption on my > Marvell 88SX6081, at least during serial read tests. I'll test with > a level 0 dump tonight; my writes go via tee to the filesystem and > sha1(1) so I should pick up any silent corruption. Doh: http://voi.aagh.net/voi.nightsdawn.sf-swap-day.png Making a 100GB dump of /usr, then making a par2 set results in minor paging activity all through it. Running sha1 over the dump has a similar effect. It settles around 2.5MB swap now, though; 6 would quickly settle around 10MB, so it does appear to be improved somewhat; top isn't showing fetchmail and friends as <swapped> for instance. This is off a single ata(4) disk, which peaks around 65MB/s. sha1 file results match that from the dump|tee file|sha1 > file.sha1 at least :) -- Thomas 'Freaky' Hurst http://hur.st/
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