linux-kernel - Re: Transparent Hugepage Support #25

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Date:	Fri, 21 May 2010 05:26:13 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Izik Eidus <ieidus@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: Transparent Hugepage Support #25

Le vendredi 21 mai 2010 à 02:05 +0200, Andrea Arcangeli a écrit :
> If you're running scientific applications, JVM or large gcc builds
> (see attached patch for gcc), and you want to run from 2.5% faster for
> kernel build (on bare metal), or 8% faster in translate.o of qemu (on
> bare metal), 15% faster or more with virt and Intel EPT/ AMD NPT
> (depending on the workload), you should apply and run the transparent
> hugepage support on your systems.
> 
> Awesome results have already been posted on lkml, if you test and
> benchmark it, please provide any positive/negative real-life result on
> lkml (or privately to me if you prefer). The more testing the better.
> 

Interesting !

Did you tried to change alloc_large_system_hash() to use hugepages for
very large allocations ? We currently use vmalloc() on NUMA machines...

Dentry cache hash table entries: 2097152 (order: 12, 16777216 bytes)
Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes)
IP route cache hash table entries: 524288 (order: 10, 4194304 bytes)
TCP established hash table entries: 524288 (order: 11, 8388608 bytes)


0xffffc90000003000-0xffffc90001004000 16781312 alloc_large_system_hash+0x1d8/0x280 pages=4096 vmalloc vpages N0=2048 N1=2048
0xffffc9000100f000-0xffffc90001810000 8392704 alloc_large_system_hash+0x1d8/0x280 pages=2048 vmalloc vpages N0=1024 N1=1024
0xffffc90005882000-0xffffc90005c83000 4198400 alloc_large_system_hash+0x1d8/0x280 pages=1024 vmalloc vpages N0=512 N1=512
0xffffc90005c84000-0xffffc90006485000 8392704 alloc_large_system_hash+0x1d8/0x280 pages=2048 vmalloc vpages N0=1024 N1=1024



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