On Tue, May 24, 2011 at 04:49:27PM +0100, Pádraig Brady wrote:
>
> So am I out of look with my new i3 sandy bridge CPU?
> Are PEBS restricted to i7 versions only?
> Is this documented anywhere?
i3 and i7 are marketing terms that don't mean much.
Engineers care more about the output of:
#!/usr/bin/env python
import struct
def cpuid(eax):
f = open("/dev/cpu/0/cpuid", "rb")
f.seek(eax)
data = f.read(16)
f.close()
return struct.unpack('IIII', data)
print "%x" % cpuid(1)[0]
>
> Maybe I need some kernel support as hinted at by:
> http://lwn.net/Articles/430100/
> My kernel is 2.6.38.6-27.fc15.x86_64
Your kernel probably has support for most of PEBS. What's missing is
support in user space for all the events in manuals.
http://thread.gmane.org/gmane.comp.linux.perfmon2.devel/2912
Kernel is still missing:
* Ability to dump all of x86 architectural state to perf.data on an
event
* Uncore events
* Exposing offcore events to userspace
http://lwn.net/Articles/441209/ has a summary of recent discussions on
this topic.
-Arun
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