lkml.org 
[lkml]   [2007]   [Oct]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] sched: high-res preemption tick
From
Date
On Fri, 2007-10-12 at 22:51 +0200, Peter Zijlstra wrote:
> Subject: sched: high-res preemption tick
>
> Use HR-timers (when available) to deliver an accurate preemption tick.

This patch further reduced iperf context switching, and boosted
throughput.

iperf -c localhost -P 10 -t 300

Previously reported numbers

2.6.23-smp
[SUM] 0.0-300.0 sec 153 GBytes 4.39 Gbits/sec
[SUM] 0.0-300.1 sec 148 GBytes 4.23 Gbits/sec
[SUM] 0.0-300.0 sec 152 GBytes 4.36 Gbits/sec

2.6.23-smp-d (sched-devel)
[SUM] 0.0-300.0 sec 173 GBytes 4.96 Gbits/sec
[SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec
[SUM] 0.0-300.0 sec 172 GBytes 4.93 Gbits/sec

Numbers from fresh pull today

2.6.23-smp-d-hrt
(re-enable PREEMPT_RESTRICT)
[SUM] 0.0-300.1 sec 181 GBytes 5.19 Gbits/sec
[SUM] 0.0-300.0 sec 182 GBytes 5.22 Gbits/sec
[SUM] 0.0-300.1 sec 182 GBytes 5.22 Gbits/sec

2.6.23-smp-d
[SUM] 0.0-300.1 sec 174 GBytes 4.97 Gbits/sec
[SUM] 0.0-300.1 sec 173 GBytes 4.95 Gbits/sec
[SUM] 0.0-300.1 sec 173 GBytes 4.96 Gbits/sec


-
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: 2007-10-13 09:21    [from the cache]
©2003-2011 Jasper Spaans