[cod] OT: /proc, top, ps broken in some linux kernels?

[MightyMike]

the cpu usage isn't flat. sometimes it got big up and downs
----- Original Message -----
From: "Steven Hartland" <killing at multiplay.co.uk>
To: <cod at icculus.org>
Sent: Tuesday, June 01, 2004 9:58 PM
Subject: [cod] OT: /proc, top, ps broken in some linux kernels?


> Ok Im trying to get some comparison results between OS
> on the same machine running the same game servers.
> I've got my results for FreeBSD 5.2.1 and have just switched
> to Suse 9.0 i386 running kernel 2.4.21-215 ( stripped down
> compile ).
>
> The results Im seeing in top / ps appear to be just blatant
> crap. I've got a 32 player COD server with 32 players in
> it with when I load top will sometimes show as using 25%
> and sometimes show as using ~0% and not just for a few
> seconds either for minutes. Next I have a 32 player MOHAA
> server which again has 32 players in it and is only using
> 2% CPU.
> As you will appreciate I don't believe this for one minute.
> But I have seen over the years people report just this type
> of usage on this list.
>
> So the question is /proc and hence ps / top broken in this
> kernel version? Is this some type of integer overflow in the
> kernel so instead of reporting say 66K of something its
> rolling over and reporting a very small number?
>
> Anyone how has posted CPU loads before that seem
> way too low I would be very interested to hear what
> kernel version / machine spec u are running ( could be
> a combination of a fast machine + specific kernel version
> that brings this to light ).
>
>     Steve / K
>
>
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