Re: 2.[45] fixes for design locking bug in wait_on_page/wait_on_buffer/get_request_wait

From: Marc-Christian Petersen (m.c.p@wolk-project.de)
Date: Sat Nov 16 2002 - 12:43:36 EST


On Saturday 16 November 2002 18:32, Andrea Arcangeli wrote:

Hi Andrea,

> you may want to try with this setting that helps with very slow devices:
> echo 2 500 0 0 500 3000 3 1 0 > /proc/sys/vm/bdflush
>
> or also with my current default tuned for high performance:
> echo 50 500 0 0 500 3000 60 20 > /proc/sys/vm/bdflush
I've tested both without any changes, "pausings" are still there.

> you may have too many dirty buffers around and you end running at disk
> speed at every memory allocation, the first setting will decrease the
> amount of dirty buffers dramatically, if you still have significant
> slowdown with the first setting above, it's most probably only the usual
> elevator issue.
Seems so.

So I have to use 2.4.18 until there is a real proper fix for that.

ciao, Marc
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