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

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Date:	Thu, 20 May 2010 13:44:18 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
CC:	miklos@...redi.hu, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [RFC PATCH] fuse: support splice() reading from fuse device

On Thu, 20 May 2010, Jens Axboe wrote:
> On Thu, May 20 2010, Miklos Szeredi wrote:
> > This continues zero copy I/O support on the fuse interface.  The first
> > part of the patchset (splice write support on fuse device) was posted
> > here:
> > 
> >   http://lkml.org/lkml/2010/4/28/215
> > 
> > With Jens' pipe growing patch and additional fuse patches it was
> > possible to achieve a 20GBytes/s write throghput on my laptop in a
> > "null" filesystem (no page cache, data goes to /dev/null).
> 
> Do you have some numbers on how that compares to the same test with the
> default 16 page pipe size?

With the default 64k pipe size it's about 4 times slower than with a
pipe size of 1MB.

Miklos
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