Date: Fri, 19 Oct 2007 03:00:52 +0400 From: Boris Samorodov <bsam@ipt.ru> To: Scott Long <scottl@samsco.org> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: amrd disk performance drop after running under high load Message-ID: <32246027@ipt.ru> In-Reply-To: <4717D6BC.5090206@samsco.org> (Scott Long's message of "Thu\, 18 Oct 2007 15\:57\:16 -0600") References: <47137D36.1020305@chistydom.ru> <47140906.2020107@FreeBSD.org> <47146FB4.6040306@chistydom.ru> <47147E49.9020301@FreeBSD.org> <47149E6E.9000500@chistydom.ru> <4715035D.2090802@FreeBSD.org> <4715C297.1020905@chistydom.ru> <4715C5D7.7060806@FreeBSD.org> <47165A01.1030806@chistydom.ru> <07289061@ipt.ru> <4717D6BC.5090206@samsco.org>
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On Thu, 18 Oct 2007 15:57:16 -0600 Scott Long wrote: > Boris Samorodov wrote: > > Since nobody answered so far, here is my two cents. I'm not an expert > > here so it's only my imho. > > > > On Wed, 17 Oct 2007 22:52:49 +0400 Alexey Popov wrote: > > > >> interrupt total rate > >> irq6: fdc0 8 0 > >> irq14: ata0 47 0 > >> irq16: uhci0 1428187319 1851 > > ^^^^^^^^^^ ^^^^ [1] > >> irq18: uhci2 12374352 16 > >> irq23: ehci0 3 0 > >> irq46: amr0 11983237 15 > >> irq64: em0 1427141755 1850 > > ^^^^^^^^^^ ^^^^ [2] > >> cpu0: timer 1540896452 1997 > >> cpu1: timer 1542377798 1999 > >> Total 5962960971 7730 > > > > [1] and [2] looks suspicious to me (totals and rate are too close to > > each other and btw to timers). Let the latter (timers) alone. Do you > > use any USB device? Can you try to use other network card? That > > behaviour seems to be an interrupt storm and/or irq collision. > It's neither. It's a side effect of a feature that FreeBSD abuses for > handling interrupts. Note that amr0 and ehci2 are acting similar. It's > mostly harmless, but it does waste CPU cycles. I wouldn't expect this > on a recent version of FreeBSD, though, at least not from the e1000 > driver. I see. Sorry for the noise. So, as I can understand _that_ can't be the problem (as at subj) the OP is seeing? WBR -- bsam
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