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Old 07-28-2003, 11:11 AM   #1
LQ Newbie
Registered: Jul 2003
Posts: 2

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Unhappy redhat 9 + hyperthreading?

hey there everyone,

I wanted to ask whether someone of you also experienced problems with redhat 9 detecting the 2 virtual cpus on a hyperthreading system. I got an Asus p4t533 mobo + p4 3.06ghz (533mht fsb), and redhat seems to detect the 2 virt. cpus properly, since it chooses and installs the smp kernel, however, after booting into it after installation, it only reports having one cpu (top, gtop, /proc/cpuinfo etc....).

windows xp on the same system detects the 2 virtual cpus just fine, and so does a suse 8.1 installation :\

I tried upgrading the kernel... but no change

any ideas how i could fix that?

cheers and thanks,
Old 07-28-2003, 03:52 PM   #2
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Registered: Jul 2003
Distribution: Fedora Core 1
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kernel has to support it... did you make sure the redhat kernel supports HT? XP has support for HT and im assuming SuSe did too, since it detected it.
Old 08-18-2003, 12:05 PM   #3
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Registered: Aug 2003
Location: New Mexico
Distribution: Redhat 9.0, 2.4.20-19.9smp
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I just set up two new intel 3.0GHz machines with the 800MHz system bus and a MSI i865P (i was pretty mad that I didn't get the i865PE) with redhat 9.0. I'm currently running with the 2.4.20-19.9smp kernel, and it detected the 2 virtual cpus without a problem.
Old 08-18-2003, 10:01 PM   #4
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Registered: Aug 2003
Location: Portland, Oregon
Distribution: Arch
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well, I recommend to things
1) try a custom kernel, I know hyperthreading is not in the 2 latest kernels (2.4.21 and 2.6.0-test3) however enabling smp is supposed to make it work. also I do not have hyperthreading but plan to get it, I am not sure if linux is even supposed to see it as 2 cpu's, yuo can try doing a dual kernel boot option, boot a regualr and an smp and run an smp capeable benchmark in both and see if it works.
2) I would ditch redhat, I ama slack user but an emergancy forced me to get redhat while away from an internet connection, it has no mp3 support (alright if you have an internet connection) and I also noticed a lot of incompatabilities. also redhat has a lot of proprietary stuff in it. and last but far from least, it is owned by aol-time-warner


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