Re: Errors in the VM - detailed

From: Roy Sigurd Karlsbakk (roy@karlsbakk.net)
Date: Sat Feb 02 2002 - 10:03:03 EST

On Sat, 2 Feb 2002, Jens Axboe wrote:

> On Sat, Feb 02 2002, Roy Sigurd Karlsbakk wrote:
> > > Jens said earlier "Roy, please try and change
> > > the queue_nr_requests assignment in ll_rw_blk:blk_dev_init() to
> > > something like 2048." - Roy have you tested this too?
> >
> > No ... Where do I change it?
>
> drivers/block/ll_rw_blk.c:blk_dev_init()
> {
> queue_nr_requests = 64;
> if (total_ram > MB(32))
> queue_nr_requests = 256;
>
> Change the 256 to 2048.

Is this an attempt to fix the problem #2 (as described in the initial
email), or to further improve throughtput?

Problem #2 is _the_ worst problem, as it makes the server more-or-less
unusable 

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

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

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This archive was generated by hypermail 2b29 : Thu Feb 07 2002 - 21:00:22 EST