Re: Something wrong with scheduler in linux 2.1.127/2.1.128
H.J. Lu (hjl@lucon.org)
Sun, 15 Nov 1998 08:50:25 -0800 (PST)
> I can't say anything about 2.1.127 (I skipped it), but I'm having some
> scheduler problems too (I assume shed) on my 486dx2-66 (UP, SMP
> disabled) 128 kernel.
>
> After a fresh boot, X-Windows starts up (XDM), I log in, fire up an
> xterm, and do a `tar -zxvf foo' or `tar -Ixvf foo' (doesn't matter), and
> the tar/{g,b}zip combo runs really slowly. The rest of the system seams
> to be normal (or mostly so, not sure). This is within 5-10 minutes of
> booting. Prior to booting (when I first noticed the problem), I ran top
> and found that tar/gzip were using < 10% cpu (only X going otherwise).
> Running `procinfo -dn1' showed idle at 90-97%. I went back to 126 and
> something similar (tar/bzip2) and user was 50-90% (ie user/system/idle
> etc made sense).
>
One more data point, I think the problem may have something to with
the new swap code in 2.1.127. When the slowdown happened in 2.1.127
and 2.1.128, there were some moderate swapping.
--
H.J. Lu (hjl@gnu.org)
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