Stall Decomposition, "Cycle Accounting" Whitepaper, and FE+Scoreboard

Analyzers

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

Stall Decomposition, "Cycle Accounting" Whitepaper, and FE+Scoreboard

445 Views

I am profiling an application on Core 2, using the methodology presented in "Cycle Accounting, analysis on Intel Core2 Processors" and "Introduction to performance analysis on Intel Core 2 Duo Processors" both by Dr. Levinthal (available on the VTune website).

Almost all of my stalled cycles are due to "FE + Scoreboard." It seems that I'm saturating the FSB, as measured by an 80% bus utilization (BUS_TRANS_ANY.ALL_AGENTS). Is that correlation all I can get with the Core 2 PMU, or is there some measurement that will show more direct evidence that FSB is indeed the culprit?

Thanks,
Matt

Link Copied

0 Replies

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.