Re: Problem with Asus P4C800-DX and P4 -Northwood-

[Bill Davidsen <davidsen@tmr.com>]

One other oddment about this motherboard, Forgive if I have over-snipped 
this trying to make it relevant...

Andreas Baer wrote:
> Willy Tarreau wrote:
>
> > On Mon, Jul 25, 2005 at 03:10:08PM +0200, Andreas Baer wrote:

> > There clearly is a problem on the system installed on this machine. 
> > You should
> > use strace to see what this machine does all the time, it is 
> > absolutely not
> > expected that the user/system ratios change so much between two nearly
> > identical systems. So there are system calls which eat all CPU. You 
> > may want
> > to try strace -Tttt on the running process during a few tens of 
> > seconds. I
> > guess you'll immediately find the culprit amongst the syscalls, and it 
> > might
> > give you a clue.
>
>
> I hope you are talking about a hardware/kernel problem and not a software
> problem, because I tried it also with LiveCD's and they showed the same 
> results
> on this machine.
> I'm not a linux expert, that means I've never done anything like that 
> before,
> so it would be nice if you give me a hint what you see in this results. :)

Am I misreading this, or is your program doing a bunch of seeks not 
followed by an i/o operation? I would doubt that's important, but your 
vmstat showed a lot of system time, and I just wonder if llseek() is 
more expensive in Linux than Windows. Or if your code is such that these 
calls are not optimized away by gcc.

> strace output for desktop:
> <--snip-->

> [pid  1431] 1122318636.262578 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017>
> [pid  1431] 1122318636.262654 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017>
> [pid  1431] 1122318636.262732 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017>
> [pid  1431] 1122318636.262809 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.262881 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.262952 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263023 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263094 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.263165 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263237 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.263310 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263381 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263452 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263523 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.263594 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263666 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017>
> [pid  1431] 1122318636.263740 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000024>
> [pid  1431] 1122318636.263841 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263913 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.263984 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000014>
> [pid  1431] 1122318636.264055 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264127 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264199 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264271 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264342 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.264414 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.264487 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264558 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.264630 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264710 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264788 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.264861 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.264934 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.265006 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265077 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265149 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000014>
> [pid  1431] 1122318636.265220 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265292 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.265363 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.265436 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265509 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265580 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265652 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.265726 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017>
> [pid  1431] 1122318636.265818 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265891 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.265963 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.266034 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.266106 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.266177 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.266250 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>
> [pid  1431] 1122318636.266322 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.266394 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015>
> [pid  1431] 1122318636.266466 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016>

--
   -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
 last possible moment - but no longer"  -me
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