linux-kernel - Re: [PATCH resend^2] mm: increase RECLAIM

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Message-Id: <20110412162631.B51C.A69D9226@jp.fujitsu.com>
Date:	Tue, 12 Apr 2011 16:25:59 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Chris McDermott <lcm@...ux.vnet.ibm.com>
Subject: Re: [PATCH resend^2] mm: increase RECLAIM_DISTANCE to 30

> On Tue, 2011-04-12 at 10:01 +0900, KOSAKI Motohiro wrote:
> > > On Mon, 2011-04-11 at 17:19 +0900, KOSAKI Motohiro wrote:
> > > > This patch raise zone_reclaim_mode threshold to 30. 30 don't have
> > > > specific meaning. but 20 mean one-hop QPI/Hypertransport and such
> > > > relatively cheap 2-4 socket machine are often used for tradiotional
> > > > server as above. The intention is, their machine don't use
> > > > zone_reclaim_mode.
> > > 
> > > I know specifically of pieces of x86 hardware that set the information
> > > in the BIOS to '21' *specifically* so they'll get the zone_reclaim_mode
> > > behavior which that implies.
> > 
> > Which hardware?
> 
> I'd have to go digging for the model numbers.  I just remember having
> discussions with folks about it a couple of years ago.  My memory isn't
> what it used to be. :)

O.K.

> 
> > The reason why now we decided to change default is the original bug reporter was using
> > mere commodity whitebox hardware and very common workload. 
> > If it is enough commotidy, we have to concern it. but if it is special, we don't care it.
> > Hardware vendor should fix a firmware.
> 
> Yeah, it's certainly a "simple" fix.  The distance tables can certainly
> be adjusted easily, and worked around pretty trivially with boot
> options.  If we decide to change the generic case, let's also make sure
> that we put something else in place simultaneously that is nice for the
> folks that don't want it changed.  Maybe something DMI-based that digs
> for model numbers?

That pretty makes sense. If you can find exacl model number, I'm fully
assist this portion.


> I'll go try and dig for some more specifics on the hardware so we at
> least have something to test on.

Thank you!



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