linux-kernel - Re: The performance and behaviour of the anti-fragmentation related patches

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Message-ID: <Pine.LNX.4.64.0703012137580.1768@schroedinger.engr.sgi.com>
Date:	Thu, 1 Mar 2007 21:40:45 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@...net.ie>, mingo@...e.hu,
	jschopp@...tin.ibm.com, arjan@...radead.org,
	torvalds@...ux-foundation.org, mbligh@...igh.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches

On Fri, 2 Mar 2007, Nick Piggin wrote:

> So what do you mean by efficient? I guess you aren't talking about CPU
> efficiency, because even if you make the IO subsystem submit larger
> physical IOs, you still have to deal with 256 billion TLB entries, the
> pagecache has to deal with 256 billion struct pages, so does the
> filesystem code to build the bios.

You do not have to deal with TLB entries if you do buffered I/O.

For mmapped I/O you would want to transparently use 2M TLBs if the 
page size is large.

> So you are having problems with your IO controller's handling of sg
> lists?

We currently have problems with the kernel limits of 128 SG 
entries but the fundamental issue is that we can only do 2 Meg of I/O in 
one go given the default limits of the block layer. Typically the number 
of hardware SG entrie is also limited. We never will be able to put a 



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