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

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Message-ID: <dda83e780705281557raeb2769q73ec59249674e704@mail.gmail.com>
Date:	Mon, 28 May 2007 15:57:04 -0700
From:	"Bret Towe" <magnade@...il.com>
To:	"Nitin Gupta" <nitingupta910@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-mm-cc@...top.org,
	linuxcompressed-devel@...ts.sourceforge.net,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Daniel Hazelton" <dhazelton@...er.net>,
	"Richard Purdie" <richard@...nedhand.com>,
	"Satyam Sharma" <satyam.sharma@...il.com>
Subject: Re: [RFC] LZO de/compression support - take 6

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
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