Messages in this thread | | | Date | Thu, 3 Jul 2003 18:56:24 -0400 (EDT) | From | Mark Hahn <> | Subject | Re: kernel 2.4.21 , large disk write => system crawls |
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> >>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!
> 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?
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