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Message-ID: <1432331020.2185.8.camel@stgolabs.net>
Subject: Re: [PATCH] mm: meminit: Finish initialisation of struct pages
 before basic setup
From: Davidlohr Bueso <dave@stgolabs.net>
Date: Fri, 22 May 2015 14:43:40 -0700
In-Reply-To: <555F6404.4010905@hp.com>
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	 <1432276201.11133.1@cpanel21.proisp.no> <20150522093313.GZ2462@suse.de>
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To: Waiman Long <waiman.long@hp.com>
Cc: Mel Gorman <mgorman@suse.de>, Daniel J Blueman <daniel@numascale.com>, Andrew Morton <akpm@linux-foundation.org>, nzimmer <nzimmer@sgi.com>, Dave Hansen <dave.hansen@intel.com>, Scott Norton <scott.norton@hp.com>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Steffen Persvold <sp@numascale.com>

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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