lkml.org 
[lkml]   [2015]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC] ioctl based CAT interface
On Fri, Nov 13, 2015 at 05:51:00PM +0100, Peter Zijlstra wrote:
> On Fri, Nov 13, 2015 at 02:39:33PM -0200, Marcelo Tosatti wrote:
> > + * * one tcrid entry can be in different locations
> > + * in different sockets.
>
> NAK on that without cpuset integration.
>
> I do not want freely migratable tasks having radically different
> performance profiles depending on which CPU they land.

Ok, so, configuration:


Socket-1 Socket-2

pinned thread-A with 100% L3 free
80% of L3
reserved


So it is a problem if a thread running on socket-2 is scheduled to
socket-1 because performance is radically different, fine.

Then one way to avoid that is to not allow freely migratable tasks
to move to Socket-1. Fine.

Then you want to use cpusets for that.

Can you fill in the blanks what is missing here?



\
 
 \ /
  Last update: 2015-11-13 19:01    [W:0.213 / U:0.440 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site