Jan Engelhardt wrote:
On Dec 12 2007 00:31, Rene Herman wrote:
Would some people on x86 (both 32 and 64) be kind enough to compile and run the
attached program? This is about testing how long I/O port access to port 0x80
takes. It measures in CPU cycles so CPU speed is crucial in reporting.
Transmeta TM5800 CPU with nominal frequency 933 MHz, but it has a
hardware(!) 'ondemand' governor over the range of frequencies that
the user allowed scaling over, irrespective of the software governor.
(That is, if the CPU can do 300,533 and 933 MHz, and setting the
min/max to 300/533 will cause the hardware to 'ondemand' between 300
and 533 only. And that even if 'performance' is set on the software
side - so the only way to enforce 'performance' is to actually set
min=933.)
Actually it has two different ones (economy and performance), you can
use the "longrun" utility to select which one.
Either way, all Transmeta processors have a fixed TSC, so there is no issue.
-hpa
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