On Sat, Oct 04, 2003 at 04:39:03PM +0200, Mikulas Patocka wrote: > Hi > > I installed FreeBSD 4.9RC1 on P4 3GHz with hyperthreading and I see > drastic slowdown when kernel with hyperthreading is booted. For example > program compilation took this time: > > hyperthreading kernel, make -j 1 --- 1:09 > hyperthreading kernel, make -j 2 --- 0:42 > singlethreading kernel, make -j 1 --- 0:45 > singlethreading kernel, make -j 2 --- 0:41 > > Compilation does very few system calls so when I compile with only one > process (-j 1), it should be as fast as with singlethreading kernel. Do > you have any idea why is it so slow?
Do you realise that hyperthreading != a secret extra CPU in your system? Kris
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