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5255 Discussions

CPI level for hardware

Udotech
Beginner
‎07-30-2010 02:51 AM
924 Views
Hi all,
From VTune documentation , it is said that CPI level of 0.75 is very good and 4.0 is poor. I have been getting CPI value of about 25 for my ethernet nic module, then I removed the driver and got a better driver installed, then my performance from CPI improved to 19. Actually my test improved , but I really want to know the if the VTune documented level for CPI holds for all hardwra modules. I also do see up to 6 for other modules.
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TimP
Honored Contributor III
‎07-30-2010 06:33 AM
924 Views
CPI target levels are over-emphasized for normal user code. I don't see how they could be applied to hardware drivers.
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Udotech
Beginner
‎08-01-2010 08:37 AM
924 Views
Hi,
thank you for the feedback. How then can I determine the performance of a hardware using VTune.
Thanks
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