linux-kernel - Re: ANN: linux-kernel-lzo-2.06.20120123

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Message-ID: <20121009083910.GI4405@twin.jikos.cz>
Date:	Tue, 9 Oct 2012 10:39:10 +0200
From:	David Sterba <dave@...os.cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>,
	linux-kernel@...r.kernel.org, chris.mason@...ionio.com,
	linux-btrfs@...r.kernel.org, Nitin Gupta <ngupta@...are.org>,
	Richard Purdie <rpurdie@...nedhand.com>,
	David Sterba <dave@...os.cz>
Subject: Re: ANN: linux-kernel-lzo-2.06.20120123 - update LZO to v2.06

On Wed, Jan 25, 2012 at 02:36:18AM +0100, Andi Kleen wrote:
> I ran benchmarks on the new miniLZO and LZ4 on 64bit. LZ4 is generally slower 
> than snappy/lzo in the micro benchmarks.

And the reason why you measured worse speed for LZ4 although (AFAICT)
everybody else's measurements claim the opposite is quite simple:
likely due to a copy&paste error you did not benchmark LZ4 at all:

https://github.com/andikleen/snappy-c/blob/master/glue.c#L282

274 void test_lz4(char *map, size_t size, char *fn)
275 {
276         int i;
277         int err;
278         size_t outlen = size * 2;
279         char *out = xmalloc(outlen);
280         char *buf2 = xmalloc(size);
281
282         BENCH(fastlz, "lz4", fn, NULL);
                  ^^^^^^

283
284         free(out);
285         free(buf2);
286 }

(LZ4 is on it's track towards kernel)

david
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