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Re: I/O performance issues on 2.4.23 SMP system



Benjamin Sherman said on Tue, Jan 27, 2004 at 03:49:24PM -0600:
> So, I have a couple of questions because this box made it to production 
> before the problem was discovered and I can't test as I'd like.
> * If I were to use 64GB HIGHMEM support. Would this problem go away?

Nope.

> * Is the I/O patch referenced (by Ingo Molnar) available for 2.4.24?

Possibly; it's certainly not merged into 2.4.24.

> * Is the patch available individually, if so, where can it be found? I 
> googled quite a bit, but didn't find anything definite.
> 
> Any thoughts or suggestions?

I've got some machines in nearly the same configuration.  What I ended up doing
was to put an `append="mem=1G"' in the lilo.conf boot stanza for the kernel I
was using, and rebooted the machine in question.

This does reduce the available memory in the machine to 1GB, but solves the IO
problem.  In my case, it was much faster, even though MySQL couldn't buffer
nearly as much as with 4GB.

M

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