linux-ext4 - Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent cache

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Message-ID: <20120413193356.GB5898@thunk.org>
Date:	Fri, 13 Apr 2012 15:33:56 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Vivek Haldar <haldar@...gle.com>,
	Andreas Dilger <adilger@...ger.ca>, linux-ext4@...r.kernel.org
Subject: Re: [RFC, PATCH] Avoid hot statistics cache line in ext4 extent
 cache

On Fri, Apr 13, 2012 at 12:26:53PM -0700, Tim Chen wrote:
> 
> The files are sparse files.  So the amount of IO is limited and we are
> not IO constrained.  
> 

... OK, and exactly how sparse are these files?  Can you say something
about the relatistic use case this workload is supposed to represent?
Or is this more of an artificial/micro benchmark?

					- Ted
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