Re: 2.6.36 io bring the system to its knees

[Jens Axboe]

On 2010-11-06 15:10, dave b wrote:
> I now personally have thought that this problem is the kernel not
> keeping track of reads vs writers properly  or not providing enough
> time to reading processes as writing ones which look like they are
> blocking the system....
> 
> If you want to do a simple test do an unlimited dd  (or two dd's of a
> limited size, say 10gb) and a find /
> Tell me how it goes :) ( the system will stall)
> (obviously stop the dd after some time :) ).
> 
> http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/4561
> iirc can reproduce this on plain ext3.

As already mentioned, ext3 is just not a good choice for this sort of
thing. Did you have atimes enabled?

-- 
Jens Axboe

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