Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel


Nicolas Pitre <nico@...>
 

On Tue, 26 Feb 2013, Markus F.X.J. Oberhumer wrote:

On 2013-02-26 07:24, Kyungsik Lee wrote:
Hi,

[...]

Through the benchmark, it was found that -Os Compiler flag for
decompress.o brought better decompression performance in most of cases
(ex, different compiler and hardware spec.) in ARM architecture.

Lastly, CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is not always the best
option even though it is supported. The decompression speed can be
slightly slower in some cases.

This patchset is based on 3.8.

Any comments are appreciated.
Did you actually *try* the new LZO version and the patch (which is attached
once again) as explained in https://lkml.org/lkml/2013/2/3/367 ?

Because the new LZO version is faster than LZ4 in my testing, at least
when comparing apples with apples and enabling unaligned access in
BOTH versions:

armv7 (Cortex-A9), Linaro gcc-4.6 -O3, Silesia test corpus, 256 kB block-size:

compression speed decompression speed

LZO-2012 : 44 MB/sec 117 MB/sec no unaligned access
LZO-2013-UA : 47 MB/sec 167 MB/sec Unaligned Access
LZ4 r88 UA : 46 MB/sec 154 MB/sec Unaligned Access
To be fair, you should also take into account the compressed size of a
typical ARM kernel. Sometimes a slightly slower decompressor may be
faster overall if the compressed image to work on is smaller.


Nicolas

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