linux-kernel - Re: [PATCH 0/2] Squashfs: add LZ4 compression

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Date:	Fri, 26 Jul 2013 17:00:53 -0500
From:	Rob Landley <rob@...dley.net>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	Phillip Lougher <phillip.lougher@...il.com>,
	Phillip Lougher <phillip@...ashfs.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH 0/2] Squashfs: add LZ4 compression

On 07/22/2013 01:04:59 AM, Gu Zheng wrote:
> On 07/22/2013 01:07 PM, Phillip Lougher wrote:
> 
> > On 22 July 2013 04:05, Gu Zheng <guz.fnst@...fujitsu.com> wrote:
> >> Hi Phillip,
> >>         Have some tests been carried out to confirm that Squashfs  
> really
> >> can get benefit from LZ4 compression, comparing with lzo?
> >
> > This seems to be a loaded question, in that it seems to be trying to
> > reopen the "why add lz4 when we already have lzo" debate all over
> > again.  As LZ4 has been merged to mainline, this appears to be a
> > question that has already been answered.
> 
> No, they are different. LZ4 can be merged to mainline, because we can
> see the benefit(faster compressing speed under the enabled unaligned
> memory access) it brings to us comparing with lzo.
> But it's hard to say that it also really can bring benefit to  
> Squashfs.

A compression format was added to the kernel. Philip hooked up the code  
that was already in the kernel to a filesystem that was already in the  
kernel.

You consider this action controversial...

Rob--
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