Support for hyperthreading in Solaris 9 x86

Question

I have just received some new Dell Poweredge 2650 servers with 2 x 3Ghz processors. I have been trying to install Solaris 9 x86 (08/03) and to configure hyperthreading but I have not been able to do so. I am able to get the OS running but mpstat only reports 2 processors. I have enabled logical processors in the BIOS and upgraded the BIOS to version A17 with no real effect. When I boot up (or install) I do get a 'ACPI tables are not in reclaim memory' warning. I know that Solaris x86 is meant to support Hyperthreading via ACPI. Are there ACPI controls that I've forgotten to tweak? Thanks in advance for your help Anant

venkat reddy · Answer

Hmmm !! The reason is that the the BIOS puts the ACPI tables in the non- reserved memory , where as Solaris is
expecting it to be in the Reserved memory. As a result of this , Solaris disables the ACPI.
Since the OS depends upon the ACPI tables for the hyperthreading , so the hyperthreading support is disabled.

I am not sure whether Solaris or Dell guys are planning to fix it.

Anant Mistry_b50d88 · Answer

Thanks for the feedback. I have posted this issue at Sun Support too.

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