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Message-ID: <3D9D9BC0.9070801@colorfullife.com>
Date: Fri, 04 Oct 2002 15:46:40 +0200
From: Manfred Spraul <manfred@colorfullife.com>
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To: Alexander.Riesen@synopsys.com
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Subject: Re: [PATCH] pipe bugfix /cleanup
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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

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