From: Waiman Long <waiman.long@hpe.com>
To: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, Yuyang Du <yuyang.du@intel.com>,
Paul Turner <pjt@google.com>, Ben Segall <bsegall@google.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Scott J Norton <scott.norton@hpe.com>,
Douglas Hatch <doug.hatch@hpe.com>
Subject: Re: [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline
Date: Thu, 03 Dec 2015 14:34:46 -0500 [thread overview]
Message-ID: <56609956.3030201@hpe.com> (raw)
In-Reply-To: <1449117148.3314.5.camel@gmail.com>
On 12/02/2015 11:32 PM, Mike Galbraith wrote:
> On Wed, 2015-12-02 at 13:41 -0500, Waiman Long wrote:
>
>> By doing so, the perf profile became:
>>
>> 9.44% 0.00% java [kernel.vmlinux] [k] smp_apic_timer_interrupt
>> 8.74% 0.01% java [kernel.vmlinux] [k] hrtimer_interrupt
>> 7.83% 0.03% java [kernel.vmlinux] [k] tick_sched_timer
>> 7.74% 0.00% java [kernel.vmlinux] [k] update_process_times
>> 7.27% 0.03% java [kernel.vmlinux] [k] scheduler_tick
>> 5.94% 1.74% java [kernel.vmlinux] [k] task_tick_fair
>> 4.15% 3.92% java [kernel.vmlinux] [k] update_cfs_shares
>>
>> The %cpu time is still pretty high, but it is better than before.
> Is that with the box booted skew_tick=1?
>
> -Mike
>
I haven't tried that kernel parameter. I will try it to see if it can
improve the situation. BTW, will there be other undesirable side effects
of using this other than the increased power consumption as said in the
kernel-parameters.txt file?
Cheers,
Longman
next prev parent reply other threads:[~2015-12-03 19:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-02 18:41 [PATCH v2 0/3] sched/fair: Reduce contention on tg's load_avg Waiman Long
2015-12-02 18:41 ` [PATCH v2 1/3] sched/fair: Avoid redundant idle_cpu() call in update_sg_lb_stats() Waiman Long
2015-12-02 18:41 ` [PATCH v2 2/3] sched/fair: Move hot load_avg into its own cacheline Waiman Long
2015-12-02 20:02 ` bsegall
2015-12-03 19:26 ` Waiman Long
2015-12-03 19:41 ` bsegall
2015-12-03 4:32 ` Mike Galbraith
2015-12-03 19:34 ` Waiman Long [this message]
2015-12-04 2:07 ` Mike Galbraith
2015-12-04 20:19 ` Waiman Long
2015-12-03 10:56 ` Peter Zijlstra
2015-12-03 19:38 ` Waiman Long
2015-12-03 11:12 ` Peter Zijlstra
2015-12-03 17:56 ` bsegall
2015-12-03 18:17 ` Peter Zijlstra
2015-12-03 18:23 ` bsegall
2015-12-03 19:56 ` Waiman Long
2015-12-03 20:03 ` Peter Zijlstra
2015-12-04 11:57 ` [tip:sched/core] sched/fair: Move the cache-hot 'load_avg' variable " tip-bot for Waiman Long
2015-12-02 18:41 ` [PATCH v2 3/3] sched/fair: Disable tg load_avg update for root_task_group Waiman Long
2015-12-02 19:55 ` bsegall
2015-12-04 11:58 ` [tip:sched/core] sched/fair: Disable the task group load_avg update for the root_task_group tip-bot for Waiman Long
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