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Re: I/O performance issues on 2.4.23 SMP system



Daniel Erat said on Thu, Jan 29, 2004 at 08:08:49AM -0800:
> I was the poster who initiated the previous thread on this subject.  The
> problem disappeared here after we went down to 2 GB of memory (although
> we physically removed it from the server rather than passing the arg to
> the kernel... shouldn't make a difference though, I'd imagine).  We went
> straight from 4 GB to 2 GB, so I can't comment on the results of using 3
> GB.
> 
> Our problem didn't seem to directly correspond with the 1 GB threshold
> -- it wouldn't manifest itself until the server had allocated all 4 GB
> of RAM.  After a reboot, it would be nice and speedy again for a day or
> two until all the memory was being used for buffering again.

This was the behavior I saw as well.  I did a bunch of research and source
reading before actually figuring out what was going on; it wasn't a well
documented bug for some reason... I guess there aren't that many people running
large boxes using 2.4.

This makes me think that the problems I saw with 2GB were not related to the IO
subsystem, but were something else.  Time to go play around a bit; getting
those boxes up to 2GB without having to do a kernel patch/upgrade cycle would
be nice.

M

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