Date: Mon, 7 Feb 2011 11:37:43 +0100 From: Ivan Voras <ivoras@freebsd.org> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: freebsd-hackers@freebsd.org Subject: Re: Scheduler question Message-ID: <AANLkTik_kxCgtjTBshEc4zF5X%2BSKV6L1R4waYyLeM_r3@mail.gmail.com> In-Reply-To: <772B352C-7241-4326-8B49-3FB675896609@gsoft.com.au> References: <53A394ED-7C2E-4E4B-A9A7-CB5F1B27DBE3@gsoft.com.au> <iignas$kbc$1@dough.gmane.org> <AA0DA14A-A8E5-48C5-AABE-ECCB02C59D19@gsoft.com.au> <iii67s$ngs$1@dough.gmane.org> <7108E013-77D1-47F8-892E-5027DB7D432B@gsoft.com.au> <990005CD-39BD-45F6-BD07-ACEE79DF5A03@gsoft.com.au> <AANLkTincOBWKhr9qWX_dFmukWeUCG61aYT0AXd-VYYTu@mail.gmail.com> <772B352C-7241-4326-8B49-3FB675896609@gsoft.com.au>
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On 07/02/2011 04:12, Daniel O'Connor wrote: > > On 07/02/2011, at 13:02, Ivan Voras wrote: >>>> I'll be looking at it on Monday, I will let you know :) >>> >>> No luck with mlock() so it wouldn't appear to be paging is the issue :( >> >> I'm also interested in raw device vs file system access! > > Oops, sorry.. I just tried that now but it doesn't improve things :( Meaning: you still get jitter? > I am writing directly to /dev/ad10 but stressing /dev/ad14 (sudo tar -cf /dev/null /local0) Can you do only one of those things? I.e. leave all the file systems alone and just do something like 'diskinfo -vt /dev/ad14'?
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