linux-kernel - Re: [LKP] [lkp] [sched/fair] 53d3bc773e: hackbench.throughput -32.9% regression

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Message-ID: <87pos0igdd.fsf@yhuang-dev.intel.com>
Date:	Thu, 02 Jun 2016 08:28:14 +0800
From:	"Huang\, Ying" <ying.huang@...el.com>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	"Huang\, Ying" <ying.huang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, <lkp@...org>,
	<linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	Xiaolong Ye <xiaolong.ye@...el.com>
Subject: Re: [LKP] [lkp] [sched/fair] 53d3bc773e: hackbench.throughput -32.9% regression

Mike Galbraith <umgwanakikbuti@...il.com> writes:

> On Wed, 2016-06-01 at 16:53 +0800, Huang, Ying wrote:
>
>> You mean the commit is a functionality fix?
>
> Yup.
>
> These kind of things can be a bit annoying.  The fix to not subtract
> load that we never added in the first place also pushed hackbench
> around a bit.  Do anything at all with load_avg, you're gonna push
> this/that benchmark around a bit, and folks who watch numbers closely
> can end up chasing meaningless deltas.

If this report annoyed you, I am sorry about that.  We just want to be
helpful via providing some information.  Now I know hackbench is
sensitive to load_avg changes, thanks a lot for the information.

Best Regards,
Huang, Ying