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Comments (3)

1 MZitranski commented Permalink

Hi Chris, AIX is smart enough not to change the dispatching behaviour when this parameter is (inadvertently) used on POWER6 or even POWER5: You can use the command 'echo "vpm" | kdb | egrep "^Scal|^Eff"' to query the kernel about which mode is set and which mode is effective. In contrast to POWER7 you will see that the "Effective SMT Mode" on POWER5 and POWER6 will not change whatever vpm_throughput_mode is set.

2 tleibmcan commented Permalink

Hi Chris, I wonder what happens if the LPAR has only one VP. In this case will vpm_throughput_mode=4 work better as all 4 threads are used while vpm_throughput_mode=0 only uses 1 thread (primary thread)? Thanks.

3 tleibmcan commented Permalink

Hi Chris, I wonder what happens if the LPAR has only one VP. In this case will vpm_throughput_mode=4 work better as all 4 threads are used while vpm_throughput_mode=0 only uses 1 thread (primary thread)? Thanks.

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