psradm on EBUS R12 upgrade on Solaris Sparc T4-1 server - note 761568.1

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psradm on EBUS R12 upgrade on Solaris Sparc T4-1 server - note 761568.1


As per note 761568.1, the section about T4-1 Sparc server issue with the CMT technology.  There is a note recommended to turn off the hardware threads by using the psradm command.

The note specified psradm -f 0-7 to turn off all 8 threads.  I am assuming that this example is for server with single core.

For my server with 8 COREs, what would be the command to turn off hardware threads?

psrinfo show me 64 virtual CPUs, I believe it is 8 threads per CORE and hence 8x8 = 64.

Should I run "psradm -f 0-63" to turn off the virtual CPU?  What would be the performance implication after turning off the virtual CPUs?