From: Andrew Morton <akpm@zip.com.au>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: Rik van Riel <riel@conectiva.com.br>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: how not to write a search algorithm
Date: Sun, 04 Aug 2002 15:43:56 -0700 [thread overview]
Message-ID: <3D4DAE2C.F45BC9D4@zip.com.au> (raw)
In-Reply-To: 20020804220218.GF4010@holomorphy.com
William Lee Irwin III wrote:
>
> ...
> I had fixing "this box should be able to run a lot of tasks but drops
> dead instead" in mind. What subset of this were you looking for?
Getting the kernel back to the level of performance and stability
which it had before the rmap patch has to be the first step.
1) 50% increase in system load on fork/exec/exit workloads
2) Will oops on pte_chain oom
3) pte_highmem is bust
4) tripled ZONE_NORMAL consumption
5) pte chains go wrong with ntpd
6) Poor swapout bandwidth
The first three or four here are fatal to the retention of the
reverse map, IMO. Futzing around fixing them is taking time
and is holding up other work.
I may have a handle on 1). Still working it.
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next prev parent reply other threads:[~2002-08-04 22:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-04 8:35 how not to write a search algorithm Andrew Morton
2002-08-04 13:16 ` Rik van Riel
2002-08-04 20:00 ` Andrew Morton
2002-08-04 19:54 ` Rik van Riel
2002-08-04 20:38 ` William Lee Irwin III
2002-08-04 21:09 ` Andrew Morton
2002-08-04 22:02 ` William Lee Irwin III
2002-08-04 22:43 ` Andrew Morton [this message]
2002-08-04 22:47 ` William Lee Irwin III
2002-08-05 3:00 ` Andrew Morton
2002-08-05 2:55 ` Rik van Riel
2002-08-05 7:40 ` William Lee Irwin III
2002-08-05 8:44 ` Andrew Morton
2002-08-05 10:50 ` William Lee Irwin III
2002-08-04 22:45 ` Daniel Phillips
2002-08-04 23:03 ` Andrew Morton
2002-08-04 23:00 ` William Lee Irwin III
2002-08-04 23:02 ` Daniel Phillips
2002-08-04 23:21 ` Andrew Morton
2002-08-05 0:03 ` Daniel Phillips
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