CONFIG_X86_PM_TIMER is slow
From: dean gaudet
Date: Fri Nov 12 2004 - 00:53:27 EST
when using CONFIG_X86_PM_TIMER i'm finding that gettimeofday() calls take
2.8us on a p-m 1.4GHz box... which is an order of magnitude slower than
on one workload i'm seeing a 7% perf improvement by booting "acpi=off" to
force it to use tsc instead of the PM timer... (the workload calls
gettimeofday too frequently, but i can't change that).
i'm curious why other folks haven't run into this -- is it because most
systems have HPET timer as well and that's not nearly as bad as PM timer?
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