linux-kernel - Re: [PATCH v3] TLB flush optimization

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Message-ID: <4FAB4CBF.3060604@intel.com>
Date:	Thu, 10 May 2012 13:06:07 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, mgorman@...e.de,
	npiggin@...il.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, arnd@...db.de, rostedt@...dmis.org,
	fweisbec@...il.com, jeremy@...p.org, gregkh@...uxfoundation.org,
	glommer@...hat.com, riel@...hat.com, luto@....edu, avi@...hat.com,
	len.brown@...el.com, dhowells@...hat.com, fenghua.yu@...el.com,
	borislav.petkov@....com, yinghai@...nel.org, cpw@....com,
	steiner@....com, akpm@...ux-foundation.org, penberg@...nel.org,
	hughd@...gle.com, rientjes@...gle.com,
	kosaki.motohiro@...fujitsu.com, n-horiguchi@...jp.nec.com,
	paul.gortmaker@...driver.com, trenn@...e.de, tj@...nel.org,
	oleg@...hat.com, axboe@...nel.dk, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] TLB flush optimization

On 05/10/2012 07:45 AM, Andi Kleen wrote:

>> Have you tried what happens if you get rid of the funny multi-vector-ipi
>> scheme and use the generic smp_call functions?
> 
> Yes we did. It's much faster on larger systems.
> 
> But haven't sent the patch yet because wasn't sure if it wasn't slower
> on small systems.


Why you worried about the small system? are there some bad example there?

It should be helpful after multiple invlpg enabled. I like to take a
look this later. :)

> 
> -Andi
> 
> 


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