From: Manfred Spraul <manfred@colorfullife.com>
To: Alexander.Riesen@synopsys.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] pipe bugfix /cleanup
Date: Fri, 04 Oct 2002 15:46:40 +0200 [thread overview]
Message-ID: <3D9D9BC0.9070801@colorfullife.com> (raw)
In-Reply-To: 20021004074008.GB941@riesen-pc.gr05.synopsys.com
Alex Riesen wrote:
>
> This makes 2.4.19 + Con Kolivas patch behave very bad.
> The system goes slow, freeze, than wakes up, freeze again, etc.
>
> I did "cat /dev/zero | grep nothing".
>
> procs memory swap io system cpu
> r b w swpd free buff cache si so bi bo in cs us sy id
> 0 0 0 124592 292056 60624 70488 0 1 27 19 7 2 5 1 2
[snip]
> 0 2 1 437440 3168 52796 70132 4 20392 4 20392 493 542 0 5 95
> 0 2 2 437328 3144 52760 70168 0 19976 0 20180 602 341 1 1 98
> 10 0 6 143432 294816 52384 70168 8 128296 8 128436 2961 502 0 5 95
> 1 0 0 133448 307256 52320 70168 352 0 356 44 225 330 0 1 99
As I wrote, this is a grep problem. I assume that regexp are more
efficient over long chunks, but there must be a limit - regexp over
swapped out memory are slow ;-)
I'll send a bugreport to the grep maintainers.
>
> doesn't apply to 2.4.19
>
Yes. likely/unlikely changes, and one additional change log entry.
--
Manfred
prev parent reply other threads:[~2002-10-04 13:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-03 13:27 [PATCH] pipe bugfix /cleanup Manfred Spraul
2002-10-04 7:40 ` Alex Riesen
2002-10-04 13:46 ` Manfred Spraul [this message]
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