Re: Errors in the VM - detailed

Roy Sigurd Karlsbakk (roy@karlsbakk.net)
Sat, 2 Feb 2002 15:52:53 +0100 (CET)

> > Hmm.. suppose this is the problem anyway and that Jens patch was not enough.
> > How do the disk drive sound during the test?
> >
> > Does it start to sound more when performance goes down?
>
> Yes that would be interesting to know, if the disk becomes seek bound.

The performance never goes down. It's stable @ ~40-43 MB/s. It DID go
down, but that was before -rmap11c. Then the problem was in the VM

> Probably, my patch was really just a quick try to see if it changed
> anything.
>
> > Number of READ limits the number of concurrent streams.
> > And READA limits the maximum total read ahead.
>
> Correct, Roy you could try and change the READA balance by allocating
> lots more READA requests. Simply play around with the
> queue_nr_requests / 4 setting. Try something "absurd" like
> queue_nr_requests << 2 or even bigger.

sure.

where do I change this???

--
Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA


Computers are like air conditioners.
They stop working when you open Windows.


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