Messages in this thread | | | From | Peter Korsgaard <> | Subject | Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel | Date | Tue, 26 Feb 2013 22:58:02 +0100 |
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>>>>> "Nicolas" == Nicolas Pitre <nico@fluxnic.net> writes:
Hi,
>> 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
Nicolas> To be fair, you should also take into account the compressed Nicolas> size of a typical ARM kernel. Sometimes a slightly slower Nicolas> decompressor may be faster overall if the compressed image to Nicolas> work on is smaller.
Yes, but notice that lzo compressed BETTER than lz4 - E.G. from the introduction mail:
1. ARMv7, 1.5GHz based board Kernel: linux 3.4 Uncompressed Kernel Size: 14MB Compressed Size Decompression Speed LZO 6.7MB 21.1MB/s LZ4 7.3MB 29.1MB/s, 45.6MB/s(UA)
-- Bye, Peter Korsgaard
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