Hi, I was following the hyperthreading discussion. I tried a program (cpu intensive) under HT and with HT disabled.System has dual processor. This is my test setup. I ran 2 instances of my programA (DP machine) with HT enbaled and compared it with 2 instances of teh same programA on (DP) wit HT disabled. It looks like the program runs little bit slower with HT enabled. Now I wrote a programB which will fork and will run 2 instances of my earlier programA. So I have now 2 instances of programB running. This gave me 17% improvement with HT enabled. This results shows HT improves performance if we have 4 tasks on DP system and performance is hit if we use 2 tasks on a DP system. I did use kernel 2.4.9 I wrote this to make sure my assumptions are correct and I'm getting performance as expected.Correct me if I'm wrong. Thanks in advance __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/