Hyperthreading in linux

[ajit.kulkarni]

Hi all!
Can any body please tell me how to know in HyperThreading is enabled in linux or not.also if it is notenabled then is there any command in linux through which I can enable hyper threading without having to shutdown and going into BIOS if Hyper threading is present
thank you all for your replies in advace

[cmcevoy]

HT can only be enabled/disabled in BIOS, but you then need to use an SMP kernel to see any benefit. In practice, I find that there is little difference and I have had some stability problems with graphics drivers which seem to be related to HT so I have gone back to using a standard single processor kernel anyway.