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Hyperthreading XEON Processors

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Hyperthreading XEON Processors

Old 09-02-03, 03:21 PM
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Hyperthreading XEON Processors

Just thought I would pass on a bit of tribal knowledge regarding the subject line. I was going through my servers trying to get an accurate processor count for licensing purposes. 3 of my servers were reporting 4 processors each when I know for a fact that they have 2. After freaking out a bit, I found out that HT XEON procs virtualize themselves and everything after the BIOS recognizes 2X the number of processors. The only way to change this is via the BIOS.
Old 09-02-03, 04:19 PM
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What change would you make in the BIOS? Wouldn't that disable the HT?
Old 09-02-03, 05:19 PM
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That's correct. There's a setting in the BIOS to enable or disable Hyperthreading.

It's pretty cool to look in the Device Manager and see two processors listed.
Old 09-02-03, 05:21 PM
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It will be interesting on how Microsoft will adjust their SQL licensing because of HT.
Old 09-02-03, 06:12 PM
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Originally posted by zuffy
It will be interesting on how Microsoft will adjust their SQL licensing because of HT.
That's exactly how I ended up discovering this. I am in the process (no pun intended) of counting up processors for M$ Operations Manager and decided that 181 server processors was a bit high.

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