[lkml]   [2001]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: xmm2 - monitor Linux MM active/inactive lists graphically
On Fri, Oct 26 2001, Zlatko Calusic wrote:
> Linus Torvalds <> writes:
> > On 25 Oct 2001, Zlatko Calusic wrote:
> > >
> > > Yes, I definitely have DMA turned ON. All parameters are OK. :)
> >
> > I suspect it may just be that "queue_nr_requests"/"batch_count" is
> > different in -ac: what happens if you tweak them to the same values?
> >
> Next test:
> block: 1024 slots per queue, batch=341

That's way too much, batch should just stay around 32, that is fine.

> Still very spiky, and during the write disk is uncapable of doing any
> reads. IOW, no serious application can be started before writing has
> finished. Shouldn't we favour reads over writes? Or is it just that
> the elevator is not doing its job right, so reads suffer?

You are probably just seeing starvation due to the very long queues.

Jens Axboe

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:11    [W:0.149 / U:0.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site