linux-kernel - Re: [RFC PATCH] fuse: support splice() reading from fuse device

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Message-ID: <20100520201122.GL10452@parisc-linux.org>
Date:	Thu, 20 May 2010 14:11:22 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	akpm@...ux-foundation.org
Subject: Re: [RFC PATCH] fuse: support splice() reading from fuse device

On Thu, May 20, 2010 at 10:07:23PM +0200, Miklos Szeredi wrote:
> > It says nothing at all, in short. You need to have a real source, and a 
> > real destination. Not some empty filesystem and /dev/null destination.
> 
> Sure, I will do that.  It's just a lot harder to measure the effects
> on hardware I have access to, where the CPU speed is just damn too
> large compared to I/O speed.

Try running a CPU burner on all the cores.  Something that's low priority,
so it'll be preempted by FUSE, and doesn't consume much cache.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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