Li Zefan wrote: > Maciej Marcin Piechotka wrote: >> I've noticed that: >> >> - with x86-64 Fedora 15 DVD install images: >> - du -sh <ROOT VOLUME> was 36 GB >> - btrfs df | grep -i data have shown over 40 GB used >> - without >> - du -sh <ROOT VOLUME> is 34 GB >> - btrfs df | grep -i data have shown less then 34 GB used >> >> It seems that iso files are considered compressable while they may not be >> (and penalty is severe - 3x). >> > > With compress option specified, btrfs will try to compress the file, at most > 128K at one time, and if the compressed result is not smaller, the file will > be marked as uncompressable. > > I just tried with Fedora-14-i386-DVD.iso, and the first 896K is compressed, > with a compress ratio about 71.7%, and the remaining data is not compressed. >
correct: the compression ratio is 38.3%, pretty good :) -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
