How To Disable HT-Assist on Opteron 6200 Series

Collider

Senior member
Jan 20, 2008
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0
81
#1
I'm wondering if its possible to disable HT-Assist feature on Opteron 6200 series CPU. I've searched around BIOS and around the web but can't find anything.

Reason why I would like to disable it is that Opteron 6200 series CPUs should have 16 MB L3 Cache, however 4MB is reserved for HT-Assist, so only 12MB L3 is OS usable. For my use case it would be beneficial to gain additional 4MB L3.

Wondering if anyone has figured out how to do this. Thanks.

A couple of links detailing the issue:
https://superuser.com/questions/1266715/missing-l3-cache-in-opteron-6274-on-windows-server
https://www.supermicro.com/support/faqs/faq.cfm?faq=26991
 
Mar 10, 2004
28,284
180
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#2
It seems to be called "Probe Filter" in the BIOS settings? Can't you disable that?
 
Mar 10, 2004
28,284
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#3
The "HT" makes this a difficult Google. :)
 

Collider

Senior member
Jan 20, 2008
479
0
81
#4
Yeah HT pulls up a bunch of HyperThreading results.

Can't find anything like probe filter in BIOS :(
 

Collider

Senior member
Jan 20, 2008
479
0
81
#5
Just tried to update BIOS to latest version from SuperMicro, but unfortunately there are no new settings. So still no way to Disable HT-Assist or Probe Filter.
 
Mar 10, 2004
28,284
180
126
#6
What board is it?

It seems like HT Assist is only useful for 4 and 8 processor systems.
 

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