[lkml]   [2009]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Scheduler regression: Too frequent timer interrupts(?)

* Christoph Lameter <> wrote:

> On Fri, 17 Apr 2009, Peter Zijlstra wrote:
> > And a random 1us cutoff, is well, random.
> Its got to be somewhere.

Sorry, that's not a rational answer that makes any sense.

Peter's point is statistics 101: please show absolute values not an
event distribution cutoff - how much total time do we spend in the
kernel in that workload?

Is the overhead 1%? 2%? 0.5%? And how did it change from 2.6.22
onwards? Did it go up by 0.1%, from 1% to 1.1%? Or did the average
go down by 0.05%, while increasing the spread of events (thus
fooling your cutoff)?

These are very simple, very basic, very straightforward questions -
and no straight answer was forthcoming from you. Are you not
interested in that answer?


 \ /
  Last update: 2009-04-17 17:39    [W:0.123 / U:0.808 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site