On Tue, 26 Feb 2013, Peter Korsgaard wrote: > >>>>> "Nicolas" == Nicolas Pitre <nico@xxxxxxxxxxx> 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) OK. If LZO is now faster than LZ4 while still compressing more then I have no argument. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
