On Wed, 16 Oct 2002 05:15:33 +0400, Hans Reiser said: > What I had heard was that they generally slowed peformance, but maybe my > info is old.
Even back in the days when an IBM RS6000-220 (66mz 601 chipset) was a "new" machine, I found it actually gave a 20-30% total throughput boost, because even if the CPU wasn't blazing fast, it was faster to read 3-5 512 byte blocks off the disk and decompress them to get a 4K filesystem block than it was to actually read all 8 512-byte blocks. Among other things, you get back half your disk throughput, so you can sustain twice the I/Os.... -- Valdis Kletnieks Computer Systems Senior Engineer Virginia Tech
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