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

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Date:	Tue, 29 May 2007 09:09:26 -0400
From:	Daniel Hazelton <dhazelton@...er.net>
To:	"Nitin Gupta" <nitingupta910@...il.com>
Cc:	"Bret Towe" <magnade@...il.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-mm-cc@...top.org,
	linuxcompressed-devel@...ts.sourceforge.net,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Richard Purdie" <richard@...nedhand.com>,
	"Satyam Sharma" <satyam.sharma@...il.com>
Subject: Re: [RFC] LZO de/compression support - take 6

On Tuesday 29 May 2007 01:48:29 Nitin Gupta wrote:
> On 5/29/07, Bret Towe <magnade@...il.com> wrote:
> > On 5/28/07, Nitin Gupta <nitingupta910@...il.com> wrote:
> > > Hi,
> > >
> > > Attached is tester code used for testing.
> > > (developed by Daniel Hazelton -- modified slightly to now use 'take 6'
> > > version for 'TinyLZO')
> > >
> > > Cheers,
> > > Nitin
> > >
> > > On 5/28/07, Nitin Gupta <nitingupta910@...il.com> wrote:
> > > > (Using tester program from Daniel)
> > > >
> > > > Following compares this kernel port ('take 6') vs original miniLZO
> > > > code:
> > > >
> > > > 'TinyLZO' refers to this kernel port.
> > > >
> > > > 10000 run averages:
> > > > 'Tiny LZO':
> > > >        Combined: 61.2223 usec
> > > >        Compression: 41.8412 usec
> > > >        Decompression: 19.3811 usec
> > > > 'miniLZO':
> > > >        Combined: 66.0444 usec
> > > >        Compression: 46.6323 usec
> > > >        Decompression: 19.4121 usec
> > > >
> > > > Result:
> > > > Overall: TinyLZO is 7.3% faster
> > > > Compressor: TinyLZO is 10.2% faster
> > > > Decompressor: TinyLZO is 0.15% faster
> >
> > 10000 run averages:
> > 'Tiny LZO':
> >         Combined: 112.6642 usec
> >         Compression: 56.3321 usec
> >         Decompression: 56.3321 usec
> > 'miniLZO':
> >         Combined: 77.6642 usec
> >         Compression: 56.3416 usec
> >         Decompression: 21.3226 usec
> >
> > now the interesting bit I thought was the following
> > root@...i:/usr/src/lzo1x-test-4# ./fulltest
> > [test_lzo.c::compress (93)] run took 42 microseconds
> > [test_lzo.c::decompress (127)] run took 20 microseconds
> > root@...i:/usr/src/lzo1x-test-4# ./tinytest
> > [test.c::compress (91)] run took 44 microseconds
> > [test.c::decompress (117)] BUG: lzo1x_decompress has failed ( t == -6 )
> > [test.c::main (149)] BUG: Decompression routine failure
>
> Did you use x86 for above test? Maybe some problem with testing
> script? What data did you use for this test?
>
>
> - Nitin

Using any version of the test code below 5 on a non-LE system would result in 
this error. Those earlier versions couldn't handle BE systems because I was 
too lazy to define cpu_to_le16. (And yes, Nitin, that does appear to be the 
correct conversion to use)

DRH

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