Analyzers
Talk to fellow users of Intel Analyzer tools (Intel VTune™ Profiler, Intel Advisor)
4999 Discussions

CPI level for hardware

Udotech
Beginner
‎07-30-2010 02:51 AM
454 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.
Thanks
0 Kudos

Link Copied

2 Replies
TimP
Honored Contributor III
‎07-30-2010 06:33 AM
454 Views
CPI target levels are over-emphasized for normal user code. I don't see how they could be applied to hardware drivers.
0 Kudos
Copy link
Udotech
Beginner
‎08-01-2010 08:37 AM
454 Views
Hi,
thank you for the feedback. How then can I determine the performance of a hardware using VTune.
Thanks
0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.