performance counter event
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performance counter event

 
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Vasanth Venkatachalam
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Posted: Tue Feb 15, 2005 12:42 am    Post subject: performance counter event Reply with quote
The Pentium Six family includes a performance counter event called
"BUS_TRANS_IO." The Intel manual just defines this as "the number of I/O
transactions". Has anyone used this event or can provide more information
about what this event means? Is it measuring disk accesses?

Vasanth
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Anton Ertl
Guest
Posted: Tue Feb 15, 2005 1:34 am    Post subject: Re: performance counter event Reply with quote
"Vasanth Venkatachalam" <vvenkata@uci.edu> writes:
Quote:
The Pentium Six family includes a performance counter event called
"BUS_TRANS_IO." The Intel manual just defines this as "the number of I/O
transactions". Has anyone used this event or can provide more information
about what this event means? Is it measuring disk accesses?

Educated guess: It's the number of bus transactions resulting from the
I/O accesses of instructions like IN, OUT, INS, OUTS.

- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton@mips.complang.tuwien.ac.at Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html
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