Subject: Re: [PATCH] sched: high-res preemption tick
Newsgroups: gmane.linux.kernel
Date: 2007-10-13 07:18:58 GMT (1 year, 37 weeks, 6 days, 5 hours and 31 minutes ago)
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