jffs zlib tuning
ian at imm.uklinux.net
Mon Jan 7 15:04:18 EST 2008
> On 7 Jan 2008, at 19:28, Benjamin M. Schwartz wrote:
>> Nonetheless, I decided to benchmark the compressors on
>> Uncompressed 732M
>> LZO -1 (fast) 345M
>> LZO -9 (slow) 298M
>> Gzip (defaults) 269M
>> Bzip2 (as downloaded) 236M
>> Note that fast vs. slow refers to compression speed.
>> Decompression is
>> the same speed in either case.
>> These tests were run on the whole tar-file. As noted by Bernie, the
>> differences would likely be smaller on 4KB blocks.
> I had some notes, which I can't now find, for a real-time sample
> logger we built...
> Anyway, we did some tests compressing small blocks, and I am sure
> we saw much less of a difference than Benjamin saw on his big block.
> Also, I'm pretty sure bzip2 fared very badly in our test, the small
> blocks didn't suit it at all (and it was slower, of course.)
> Of course, the statistics of our sample data was probably not
> representative, so YMMV...
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