linux-kernel - Re: [PATCH] mm: meminit: Finish initialisation of struct pages before basic setup

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Message-ID: <1432331020.2185.8.camel@stgolabs.net>
Date:	Fri, 22 May 2015 14:43:40 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Waiman Long <waiman.long@...com>
Cc:	Mel Gorman <mgorman@...e.de>,
	Daniel J Blueman <daniel@...ascale.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	nzimmer <nzimmer@....com>, Dave Hansen <dave.hansen@...el.com>,
	Scott Norton <scott.norton@...com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steffen Persvold <sp@...ascale.com>
Subject: Re: [PATCH] mm: meminit: Finish initialisation of struct pages
 before basic setup

On Fri, 2015-05-22 at 13:14 -0400, Waiman Long wrote:
> I think the non-temporal patch benefits mainly AMD systems. I have tried 
> the patch on both DragonHawk and it actually made it boot up a little 
> bit slower. I think the Intel optimized "rep stosb" instruction (used in 
> memset) is performing well. I had done similar test on zero page code 
> and the performance gain was non-conclusive.

fwiw I did some experiments with similar conclusions a while ago
(inconclusive with intel hw, maybe it was even the same machine ;)
Now, this was for optimizing clear_hugepage by using movnti, but I never
got to run it on an AMD box.

Thanks,
Davidlohr

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