From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Christoph Lameter <cl@linux.com>
Cc: kosaki.motohiro@jp.fujitsu.com, Mel Gorman <mel@csn.ul.ie>,
Rob Mueller <robm@fastmail.fm>,
linux-kernel@vger.kernel.org, Bron Gondwana <brong@fastmail.fm>,
linux-mm <linux-mm@kvack.org>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers
Date: Tue, 5 Oct 2010 14:32:27 +0900 (JST) [thread overview]
Message-ID: <20101005142527.28DB.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1010040805500.2502@router.home>
> On Mon, 4 Oct 2010, KOSAKI Motohiro wrote:
>
> > > The problem with zone reclaim mainly is created for large apps whose
> > > working set is larger than the local node. The special settings are only
> > > needing for those applications.
> >
> > In theory, yes. but please talk with userland developers. They always say
> > "Our software work fine on *BSD, Solaris, Mac, etc etc. that's definitely
> > linux problem". /me have no way to persuade them ;-)
>
> Do those support NUMA? I would think not. You would have to switch on
> interleave at the BIOS level (getting a hardware hack in place to get
> rid of the NUMA effects) to make these OSes run right.
Sure. It wouldn't. Many opensource userland developers don't like
using out of posix API. In the other hand, many proprietery developers
don't hesitate it. I don't know reason.
Also, I'm not sure evey Corei7 Motherboard have BIOS level numa interleaving.
Are you sure? generically, commodity component vendor don't like to equipe
additonal firmware feature. It's not zero cost. I think this solusion only fit
server vendor (e.g. IBM, HP, Fujitsu). but dunnno. Myself and fujitsu haven't hit
this issue. I don't know _every_ motherboard equipement in the world.
next prev parent reply other threads:[~2010-10-05 5:32 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-13 3:39 Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers Robert Mueller
2010-09-16 10:01 ` KOSAKI Motohiro
2010-09-16 17:06 ` Christoph Lameter
2010-09-17 0:50 ` Robert Mueller
2010-09-17 6:01 ` Shaohua Li
2010-09-17 7:32 ` Robert Mueller
2010-09-17 13:56 ` Christoph Lameter
2010-09-17 14:09 ` Bron Gondwana
2010-09-17 14:22 ` Christoph Lameter
2010-09-17 23:01 ` Bron Gondwana
2010-09-20 9:34 ` Mel Gorman
2010-09-20 23:41 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers Rob Mueller
2010-09-21 9:04 ` Mel Gorman
2010-09-21 14:14 ` Christoph Lameter
2010-09-22 3:44 ` Rob Mueller
2010-09-27 2:01 ` KOSAKI Motohiro
2010-09-27 13:53 ` Christoph Lameter
2010-09-27 23:17 ` Robert Mueller
2010-09-28 12:35 ` Christoph Lameter
2010-09-28 12:42 ` Bron Gondwana
2010-09-28 12:49 ` Christoph Lameter
2010-09-30 7:05 ` Andi Kleen
2010-10-04 12:45 ` KOSAKI Motohiro
2010-10-04 13:07 ` Christoph Lameter
2010-10-05 5:32 ` KOSAKI Motohiro [this message]
2010-10-04 19:43 ` David Rientjes
2010-09-21 1:05 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers KAMEZAWA Hiroyuki
2010-09-27 2:04 ` KOSAKI Motohiro
2010-09-27 2:06 ` KAMEZAWA Hiroyuki
2010-09-23 11:44 ` Balbir Singh
2010-09-30 8:38 ` Bron Gondwana
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