Messages in this thread | | | Date | Sun, 04 Apr 2004 10:07:02 +0200 | From | Andreas Hartmann <> | Subject | Re: 2.6.4 : 100% CPU use on EIDE disk operarion, VIA chipset |
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Bill Davidsen wrote: > Andreas Hartmann wrote: >> This is what top says during cp of 512MB-file: >> Cpu(s): 2.0% us, 8.3% sy, 0.0% ni, 0.0% id, 89.0% wa, 0.7% hi, >> 0.0% si >> >> New is "wa", what probably means "wait". This value is very high as long >> as the HD is writing or reading datas: >> >> cp dummy /dev/null >> produces this top-line: >> Cpu(s): 3.0% us, 5.3% sy, 0.0% ni, 0.0% id, 91.0% wa, 0.7% hi, >> 0.0% si > > Yes "wa" is not intuitive, some other operating systems use "wio" for > "wait i/o" time. As noted in the other thread, you can try the deadline > elevator or increased readahead for your load.
If the processor and the kernel could do other things during wa, like compiling e.g., it would be no problem. But it seems to be, that this is not possible. Or did I oversee something?
Regards, Andreas Hartmann
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