Messages in this thread | | | Date | Fri, 04 Jul 2003 01:06:02 +0200 | From | Charles-Edouard Ruault <> | Subject | Re: kernel 2.4.21 , large disk write => system crawls |
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Mark Hahn wrote:
>>>>when i do a large disk write operation ( copy a big file for example ), >>>>the whole system becomes very busy ( system goes into 99% cpu >>>> >>>> > >it's not write-specific. you can see below that you're somehow >managing to trigger roughly two interrupts per *either* bi or bo. >for a normal IDE setup, you should see one interrupt per 16-64K >under average use. it's almost like your sys somehow thinks >that it can only transfer 1 sector per interrupt! > > hmmm interesting i had not noticed that !
> > >>everytime i experience a slowdown, there's a 'big' number in the io (bo) >>column. >> >> > >no, it's basically in=2*(bi+bo), as if your system somehow believes >it can only do a single sector per interrupt (PIO and -m1 perhaps?) >it should be more like 32K per interrupt. > > > >>Jun 27 22:52:31 charlus kernel: Found and enabled local APIC! >> >> > >have you tried without that? > >. > > > nope. I'll do that for sure. I've already had problems with APIC on other systems ... Thanks for the hint. I'll keep you posted if it works.
-- Charles-Edouard Ruault PGP Key ID E10C24DC
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