Date: Mon, 7 Feb 2011 23:08:21 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Ivan Voras <ivoras@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Scheduler question Message-ID: <71549325-5FD1-4516-B49E-098AFBEFE8B7@gsoft.com.au> In-Reply-To: <AANLkTik_kxCgtjTBshEc4zF5X%2BSKV6L1R4waYyLeM_r3@mail.gmail.com> 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> <AANLkTik_kxCgtjTBshEc4zF5X%2BSKV6L1R4waYyLeM_r3@mail.gmail.com>
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On 07/02/2011, at 21:07, Ivan Voras wrote: >>> I'm also interested in raw device vs file system access! >>=20 >> Oops, sorry.. I just tried that now but it doesn't improve things :( >=20 > Meaning: you still get jitter? Yes, well I didn't measure the read frequency but it dropped out = (stopped streaming due to a full FIFO) no less often. >> I am writing directly to /dev/ad10 but stressing /dev/ad14 (sudo tar = -cf /dev/null /local0) >=20 > 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'? OK, I wrote the data to /dev/null from USB and ran diskutil in a loop = and it doesn't drop out. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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