On 2009-08-05 at 15:33:44 [+0200], Ingo Weinhold <ingo_weinhold@xxxxxx> wrote: > On 2009-08-05 at 14:47:16 [+0200], Brecht Machiels <brecht@xxxxxxxxxxx> > wrote: > > If so, at what performance cost does that come? > > That depends on the decompression algorithm, but I guess the interesting > ones are pretty fast anyway. IIRC for Reiser 4 using block compression > was planned, since compressing/decompressing was considered to be > significantly faster than having to write/read the saved data to/from > disk. It maybe faster in direct comparison, but that also means the CPU has less time to do other things. Usually, caching would hide much of the delay when accessing disks. And with good SSDs, the speed may be in favor of the non-compressed FS again. Best regards, -Stephan