Date: Wed, 25 May 2005 11:54:27 -0700 From: Kris Kennaway <kris@obsecurity.org> To: Matthias Buelow <mkb@incubus.de> Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: Performance of 4.x vs 5.x (Re: Lifetime of FreeBSD branches) Message-ID: <20050525185427.GB92006@xor.obsecurity.org> In-Reply-To: <4294AB75.9080908@incubus.de> References: <84dead7205052420503fded0e9@mail.gmail.com> <4293FD27.90500@incubus.de> <20050525042706.GA60021@xor.obsecurity.org> <4294054C.9080207@incubus.de> <20050525050943.GA64320@xor.obsecurity.org> <42940A81.1030801@incubus.de> <20050525052214.GA76339@xor.obsecurity.org> <42940C87.5000705@incubus.de> <20050525053054.GA76491@xor.obsecurity.org> <4294AB75.9080908@incubus.de>
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[-- Attachment #1 --] On Wed, May 25, 2005 at 06:44:37PM +0200, Matthias Buelow wrote: > Kris Kennaway wrote: > > >>interrupt total rate > >>irq1: atkbd0 586 0 > >>irq13: npx0 1 0 > >>irq14: ata0 94 0 > >>irq17: wi0 54 0 > >>irq20: fxp0 atapci1 62079 99 > >>irq21: uhci0 ehci0 1 0 > >>irq22: uhci1 1102 1 > >>lapic0: timer 1246549 1994 > >>lapic1: timer 1246427 1994 > >>Total 2556893 4091 > >>The only relevant conflict I could see is irc 20; but I had already > >>tested that by removing fxp0 from the kernel. > > > >I wonder if USB is causing the problem all on its own..since that was > >the culprit in other situations when it was being triggered by virtue > >of interrupt sharing. Any chance you can try a non-USB mouse and > >remove USB from your kernel? > > Ok, now USB (both uhci and ehci) is gone. The problem is still the > same. vmstat -i: > > interrupt total rate > irq1: atkbd0 1324 3 > irq12: psm0 8562 21 > irq13: npx0 1 0 > irq14: ata0 94 0 > irq17: wi0 381 0 > irq20: fxp0 atapci1 61956 154 > lapic0: timer 801433 1993 > lapic1: timer 801292 1993 > Total 1675043 4166 > > To be frank, I do not believe it's got anything to do with locking or > interrupts. It somehow seems just like the scheduler is doing a bad job > of balancing interactive processes vs. disk i/o. I've seen the same > stuff for years on NetBSD (until they changed scheduling around 1.5 or > so) and Linux (until 2.4 kernels). During that time FreeBSD didn't > exhibit these symptoms and only in 5.x have I seen that kind of > behaviour creep back in. Has the classic scheduler been changed > somehow? Maybe I should try and see if the problem persists with the > ULE scheduler? Others don't see this though, and in other cases it was *definitively proven* to be caused by the issue I mentioned. I'll have to think more about what to try next..thanks for running the tests. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (FreeBSD) iD8DBQFClMnjWry0BWjoQKURAtwvAKDOueLRUxtwZrozws+j3MyidpK6nwCfabQj UJFjMCqWj1VBW4FjATHc9qA= =znEi -----END PGP SIGNATURE-----
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