lkml.org 
[lkml]   [2007]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: RSDL v0.30 cpu scheduler for mainline kernels
Con,

On Mon, Mar 12, 2007 at 10:58:11AM +1100, Con Kolivas wrote:
> There are updated patches for 2.6.20, 2.6.20.2, 2.6.21-rc3 and 2.6.21-rc3-mm2
> to bring RSDL up to version 0.30 for download here:

I tried this on a Core 2 Quad cpu system(system has 4 cores on a single
package). When I run SPECjbb2000 with number of threads varying from 1-8,
I see ~4.5% perf regression with RSDL (compared to native 2.6.21-rc3) in
the 8 threads case. This I think, is coming from increased number of
context switches, when we have more than one thread(at same user priority) on
the same logical cpu.

Just to see the % increase in number of context switches, I ran 8 infinite
loops (simple while(1); 's) and with 2.6.21-rc3 I see ~70 context switches
every second, whereas with RSDL I see ~530 context switches.

thanks,
suresh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-03-15 03:33    [W:0.244 / U:0.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site