linux-kernel - Re: [PATCH v3] sched/fair: Add advisory flag for borrowing a timeslice

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Date:	Tue, 25 Nov 2014 10:27:04 -0800
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Khalid Aziz <khalid.aziz@...cle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, corbet@....net,
	mingo@...hat.com, hpa@...or.com, peterz@...radead.org,
	riel@...hat.com, akpm@...ux-foundation.org, rientjes@...gle.com,
	ak@...ux.intel.com, mgorman@...e.de, liwanp@...ux.vnet.ibm.com,
	raistlin@...ux.it, kirill.shutemov@...ux.intel.com,
	atomlin@...hat.com, avagin@...nvz.org, gorcunov@...nvz.org,
	serge.hallyn@...onical.com, athorlton@....com, oleg@...hat.com,
	vdavydov@...allels.com, daeseok.youn@...il.com,
	keescook@...omium.org, yangds.fnst@...fujitsu.com,
	sbauer@....utah.edu, vishnu.ps@...sung.com, axboe@...com,
	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v3] sched/fair: Add advisory flag for borrowing a
 timeslice

On Tue, 2014-11-25 at 07:45 -0700, Khalid Aziz wrote:
> This solution has been used by both database and java on other OSs and 
> has shown performance improvement. Andrew had asked for performance 
> numbers on Linux with this patch last time I sent this out and it took 
> me a while to get performance folks to run a full TPC-C workload. They 
> did see a 3% improvement in tpcc as I noted in commit log and that is a 
> significant improvement.

3% for such a change seems pretty worthless... I would have expected
this having to impact performance much more.

Thanks,
Davidlohr

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