Date: Thu, 18 Oct 2007 15:57:16 -0600 From: Scott Long <scottl@samsco.org> To: Boris Samorodov <bsam@ipt.ru> Cc: freebsd-hackers@freebsd.org, freebsd-stable@freebsd.org Subject: Re: amrd disk performance drop after running under high load Message-ID: <4717D6BC.5090206@samsco.org> In-Reply-To: <07289061@ipt.ru> 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>
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Boris Samorodov wrote: > Hi! > > 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. Scott
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