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SubjectRe: SiS630 chipsets && linux 2.4.x kernel == snails pace?
| From: John Jasen <jjasen1@umbc.edu>

| grep comsumes about 25% of CPU on 2.2.19, with the following times:
| 1.50user 2.79system 0:12.61elapsed 34%CPU (0avgtext+0avgdata 0maxresident)k
| 0inputs+0outputs (178major+79minor)pagefaults 0swaps
|
| on 2.4.12, it consumes between 60 and 80% of cpu, and I'm still waiting
| for times ...
|
| 101.48user 4.11system 3:22.85elapsed 52%CPU (0avgtext+0avgdata 0maxresident)k
| 0inputs+0outputs (130major+138minor)pagefaults 0swaps

That sounds like something "invisible" is eating your CPU. Perhaps
some interrupt handling.

Do a "cat /proc/interrupts", wait a few seconds and do it again. See
if any count jumped by a lot. I assume, but don't actually know, that
interrupts that are not handled are still counted.

Hugh Redelmeier
hugh@mimosa.com voice: +1 416 482-8253

On my machine, when not doing anything, I get a lot of timer
interrupts.

RFC $ cat /proc/interrupts ; sleep 10 ; cat /proc/interrupts
CPU0 CPU1
0: 13363128 13480402 IO-APIC-edge timer
1: 78903 77330 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
12: 376841 390230 IO-APIC-edge PS/2 Mouse
14: 183020 166039 IO-APIC-edge ide0
15: 236 450 IO-APIC-edge ide1
16: 2321 2395 IO-APIC-level bttv
17: 2166 2170 IO-APIC-level es1371
18: 7 7 IO-APIC-level aic7xxx
19: 619226 619253 IO-APIC-level usb-uhci, eth0
NMI: 0 0
LOC: 26844734 26844733
ERR: 43
MIS: 0
CPU0 CPU1
0: 13363381 13481153 IO-APIC-edge timer
1: 78903 77331 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
8: 1 0 IO-APIC-edge rtc
12: 376841 390230 IO-APIC-edge PS/2 Mouse
14: 183026 166062 IO-APIC-edge ide0
15: 236 450 IO-APIC-edge ide1
16: 2321 2395 IO-APIC-level bttv
17: 2166 2170 IO-APIC-level es1371
18: 7 7 IO-APIC-level aic7xxx
19: 619226 619253 IO-APIC-level usb-uhci, eth0
NMI: 0 0
LOC: 26845738 26845737
ERR: 43
MIS: 0

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