Re: Complete I/O starvation with 3ware raid on 2.6

[Nick Piggin]

Aaron Lehmann wrote:

> On Thu, Sep 25, 2003 at 12:43:01AM -0700, Andrew Morton wrote:
>
> > An update to the 3ware driver was merged yesterday.  Have you used earlier
> > 2.5 kernels?
>
> Unfortunately not. I copied a day-old CVS tree to the machine but
> decided to update before compiling to get the latest-and-greatest. I
> did notice the 3ware updates.
>
> I rebooted with the deadline scheduler. It definately isn't helping.

OK, one problem is most likely something I added a month or so ago: a
new process is now assumed to be not a good anticipate candidate. This
solved some guy's obscure problem, but a lot of programs that benefit from
anticipation (ls, gcc, vi startup, cat, etc) are only going to submit a
few requests in their life, so they lose most of the gains. I have some
automatic thingy I'm testing at the moment.

The other problem could well be a big TCQ depth. AS helps with this, but
it can't do a really good job. Try a TCQ depth of max 4.


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