Author: Robert Hyatt
Date: 20:45:28 10/04/03
Go up one level in this thread
On October 04, 2003 at 21:09:05, Gian-Carlo Pascutto wrote: >On October 04, 2003 at 21:00:34, Tom Kerrigan wrote: > >>The odd part is that hyperthreading DOES slow down my program when running 2 >>threads. > >This is caused by the schedulers not knowing the difference between the >real and virtual cpus. You're only running on 1 cpu instead of 2 about >1/3 of the time. > >Win2k3 is the only OS that has this reportedly solved. > >-- >GCP Ingo Molnar did patches for 2.4 kernels to fix this. I've run them and it works great. Stock 2.4 kernels are ignorant about SMT, but it only is a problem with 2 threads. 3 or 4 work correctly.
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