linux-kernel - Re: [RFC] LZO de/compression support

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Date:	Fri, 25 May 2007 14:33:43 +0100
From:	Richard Purdie <richard@...nedhand.com>
To:	Nitin Gupta <nitingupta910@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm-cc@...top.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Andrey Panin <pazke@...pac.ru>, Bret Towe <magnade@...il.com>,
	Michael-Luke Jones <mlj28@....ac.uk>
Subject: Re: [RFC] LZO de/compression support - take 4

Hi Nitin,

On Fri, 2007-05-25 at 18:27 +0530, Nitin Gupta wrote:
> On 5/25/07, Richard Purdie <richard@...nedhand.com> wrote:
> > On Fri, 2007-05-25 at 17:15 +0530, Nitin Gupta wrote:
> > > Richard, can you please provide perf. results for this patch also?
> > > Also, can you please mail back latest version of your LZO patch? In
> > > meantime, I will try to include benchmarking support to the
> > > 'compress-test' module.
> >
> > This version is 15% slower at decompression and about equal on
> > compression.
> 
> If you don't mind, can you please try patch attached now? I have now
> also rolled back that cpu_to_le16() change as Satyam suggested. I see
> no other reason for this perf. loss as I made no other change!

I tested it with no real change in the results. Since I'm doing the
tests on LE, cpu_to_le16() should a NOP anyway.

> Also, can you please verify if you are comparing your _safe_ version
> with this patch? This patch does not include unsafe version and the
> safe one is simply called lzo1x_decompress().

Yes, I am comparing with my safe version.

Cheers,

Richard

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