Hans Reiser wrote:
reiser4 cpu consumption is still dropping rapidly as others and I find kruft in the code and remove it. Major kruft remains still.
If a file system is getting greater throughput, that means the relevant code is being run more, which means more CPU will be used for the purpose of setting up DMA, etc. That is, if a FS gets twice the throughput, it would not be unreasonable to expect it to use 2x the CPU time.
Furthermore, in order to achieve greater throughput, one has to write more intelligent code. More intelligent code is probably going to require more computation time.
That is to say, if your FS is twice as fast, saying it has a problem purely on the basis that it's using more CPU ignores certain facts and basic logic.
Now, if you can manage to make it twice as fast while NOT increasing the CPU usage, well, then that's brilliant, but the fact that ReiserFS uses more CPU doesn't bother me in the least.
