lkml.org 
[lkml]   [2001]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Lse-tech] Re: multi-queue scheduler update
On Fri, Jan 19, 2001 at 03:12:11PM -0500, Mark Hahn wrote:
> > incurred in the current implementation. To maintain existing
> > scheduler behavior, we look at all CPU specific runqueues to find
> > the highest priority (goodness) task in the system. Therefore,
>
> do you have cpu-affinity? the mainstream scheduler at one time
> actually tuned the decision to move a task based on its expected
> timeslice and the worstcase cache-flush time.

We use the same same cpu-affinity mechanism as the current scheduler.
This simply gives a 'priority boost' to tasks that last ran on the
current CPU. In our multi-queue scheduler, tasks on a remote queue
must have high enough priority (to overcome this boost) before being
moved to the local queue.

--
Mike Kravetz mkravetz@sequent.com
IBM Linux Technology Center
15450 SW Koll Parkway
Beaverton, OR 97006-6063 (503)578-3494
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:54    [W:0.076 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site