Messages in this thread | | | Date | Tue, 19 Nov 2002 21:42:42 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: [BUG?] Xeon with HyperThreading and linux-2.4.20-rc2 |
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On Tue, 19 Nov 2002, Steffen Persvold wrote: > > I've two boxes with Dual Xeons 1.8 GHz and HT option enabled in BIOS. When > I boot 2.4.20-rc2 with default arguments the kernel detects 4 processors and > also reports 4 processors in /proc/cpuinfo wiht the "ht" feature. > > However, if I boot with the "noht" option (wich I believed turned off HT > and therefore only two processors should be available), the kernel still > detects 4 processors, _but_ now the "ht" feature in /proc/cpuinfo is not > there. Is this the intention of the "noht" option ?
No, the intention of the "noht" option is as you believed, and it used to work that way. I looked at latest sourcec, didn't see anything obviously wrong. Sorry, but I don't have a suitable HT machine to check at present.
> If so, are there any > options available to turn off HT support in the kernel completely, so that > I don't have to go into the BIOS to turn it off ? > > If you want to I can provide the dmesg output and .config. > > I think this issue is not just related to 2.4.20-rc2, but earlier kernels > aswell.
Could others check and report if 2.4.20-rc2 "noht" works for them or not?
Thanks, Hugh
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