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From: Chris Mason <clm@fb.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Matt Fleming <matt@codeblueprint.co.uk>
Cc: <mingo@kernel.org>, <tglx@linutronix.de>, <riel@redhat.com>,
	<hpa@zytor.com>, <efault@gmx.de>, <linux-kernel@vger.kernel.org>,
	<torvalds@linux-foundation.org>, <lvenanci@redhat.com>,
	<xiaolong.ye@intel.com>, <kitsunyan@inbox.ru>
Subject: Re: hackbench vs select_idle_sibling; was: [tip:sched/core] sched/fair, cpumask: Export for_each_cpu_wrap()
Date: Fri, 9 Jun 2017 13:52:06 -0400	[thread overview]
Message-ID: <acecfe24-2e31-f560-91bc-93e7e08c109c@fb.com> (raw)
In-Reply-To: <20170606092158.wqaianvbyhs5k6xk@hirez.programming.kicks-ass.net>

On 06/06/2017 05:21 AM, Peter Zijlstra wrote:
> On Mon, Jun 05, 2017 at 02:00:21PM +0100, Matt Fleming wrote:
>> On Fri, 19 May, at 04:00:35PM, Matt Fleming wrote:
>>> On Wed, 17 May, at 12:53:50PM, Peter Zijlstra wrote:
>>>>
>>>> Please test..
>>>
>>> Results are still coming in but things do look better with your patch
>>> applied.
>>>
>>> It does look like there's a regression when running hackbench in
>>> process mode and when the CPUs are not fully utilised, e.g. check this
>>> out:
>>
>> This turned out to be a false positive; your patch improves things as
>> far as I can see.
>
> Hooray, I'll move it to a part of the queue intended for merging.

It's a little late, but Roman Gushchin helped get some runs of this with 
our production workload.  The patch is every so slightly better.

Thanks!

-chris

  reply	other threads:[~2017-06-09 17:53 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-13 13:56 [RFC 0/3] sched/topology: fix sched groups on NUMA machines with mesh topology Lauro Ramos Venancio
2017-04-13 13:56 ` [RFC 1/3] sched/topology: Refactor function build_overlap_sched_groups() Lauro Ramos Venancio
2017-04-13 14:50   ` Rik van Riel
2017-05-15  9:02   ` [tip:sched/core] " tip-bot for Lauro Ramos Venancio
2017-04-13 13:56 ` [RFC 2/3] sched/topology: fix sched groups on NUMA machines with mesh topology Lauro Ramos Venancio
2017-04-13 15:16   ` Rik van Riel
2017-04-13 15:48   ` Peter Zijlstra
2017-04-13 20:21     ` Lauro Venancio
2017-04-13 21:06       ` Lauro Venancio
2017-04-13 23:38         ` Rik van Riel
2017-04-14 10:48           ` Peter Zijlstra
2017-04-14 11:38   ` Peter Zijlstra
2017-04-14 12:20     ` Peter Zijlstra
2017-05-15  9:03       ` [tip:sched/core] sched/fair, cpumask: Export for_each_cpu_wrap() tip-bot for Peter Zijlstra
2017-05-17 10:53         ` hackbench vs select_idle_sibling; was: " Peter Zijlstra
2017-05-17 12:46           ` Matt Fleming
2017-05-17 14:49           ` Chris Mason
2017-05-19 15:00           ` Matt Fleming
2017-06-05 13:00             ` Matt Fleming
2017-06-06  9:21               ` Peter Zijlstra
2017-06-09 17:52                 ` Chris Mason [this message]
2017-06-08  9:22           ` [tip:sched/core] sched/core: Implement new approach to scale select_idle_cpu() tip-bot for Peter Zijlstra
2017-04-14 16:58     ` [RFC 2/3] sched/topology: fix sched groups on NUMA machines with mesh topology Peter Zijlstra
2017-04-17 14:40       ` Lauro Venancio
2017-04-13 13:56 ` [RFC 3/3] sched/topology: Different sched groups must not have the same balance cpu Lauro Ramos Venancio
2017-04-13 15:27   ` Rik van Riel
2017-04-14 16:49   ` Peter Zijlstra
2017-04-17 15:34     ` Lauro Venancio
2017-04-18 12:32       ` Peter Zijlstra

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