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| author | Hui Lv <hui.lv@intel.com> | 2012-01-17 11:18:48 +0000 |
|---|---|---|
| committer | Hui Lv <hui.lv@intel.com> | 2012-01-17 11:18:48 +0000 |
| commit | 64908a046602f977d9b5200cf8ab4331537c0a1e (patch) | |
| tree | 34b4c04ba76e8a777a739f64f351a28a125c480a /xen/include/xen/sched-if.h | |
| parent | f7f025a9a66c9e6c14acb296ff7ce22c4aed85e8 (diff) | |
| download | xen-64908a046602f977d9b5200cf8ab4331537c0a1e.tar.gz xen-64908a046602f977d9b5200cf8ab4331537c0a1e.tar.bz2 xen-64908a046602f977d9b5200cf8ab4331537c0a1e.zip | |
sched_credit: Use delay to control scheduling frequency
This patch can improve Xen performance:
1. Basically, the "delay method" can achieve 11% overall performance
boost for SPECvirt than original credit scheduler.
2. We have tried 1ms delay and 10ms delay, there is no big difference
between these two configurations. (1ms is enough to achieve a good
performance)
3. We have compared different load level response time/latency (low,
high, peak), "delay method" didn't bring very much response time
increase.
4. 1ms delay can reduce 30% context switch at peak performance, where
produces the benefits. (int sched_ratelimit_us = 1000 is the
recommended setting)
Signed-off-by: Hui Lv <hui.lv@intel.com>
Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
Committed-by: Keir Fraser <keir@xen.org>
Diffstat (limited to 'xen/include/xen/sched-if.h')
| -rw-r--r-- | xen/include/xen/sched-if.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h index d9519f0d6c..03f9d8ddcc 100644 --- a/xen/include/xen/sched-if.h +++ b/xen/include/xen/sched-if.h @@ -16,6 +16,11 @@ extern struct cpupool *cpupool0; /* cpus currently in no cpupool */ extern cpumask_t cpupool_free_cpus; +/* Scheduler generic parameters + * */ +extern int sched_ratelimit_us; + + /* * In order to allow a scheduler to remap the lock->cpu mapping, * we have a per-cpu pointer, along with a pre-allocated set of |