Date: Mon, 17 Mar 2008 13:23:20 +0900 From: "Adrian Chadd" <adrian@freebsd.org> To: "Joseph Koshy" <jkoshy@freebsd.org> Cc: current@freebsd.org Subject: Re: issues with hwpmc and athlon XP Message-ID: <d763ac660803162123w7903e38aw2f2974605de90ff9@mail.gmail.com> In-Reply-To: <867ig2pr5j.wl%koshy@unixconsulting.co.in> References: <d763ac660803090946x11f2c6ddhc14af63305698e61@mail.gmail.com> <867ig2pr5j.wl%koshy@unixconsulting.co.in>
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On 17/03/2008, Joseph Koshy <jkoshy@freebsd.org> wrote: > It so happens that the Athlon XP machine I purchased had one of those > BIOSes that do not enable the local APIC. So I couldn't get those > PMCs to deliver an interrupt and wasn't able to test sampling on this > processor. That was frustrating, especially since Linux 2.4 and later > can override the BIOS and use the LAPIC; we can't. Hm, why can they but we can't? > Onto debugging this bug: my first question is: does system sampling > (i.e.. pmcstat -S) work OK on this CPU? It returned results. I don't know how valid the results were. In fact, I'm still not getting user-space info from pmcstat -P but that partially may be user error. I'm seeing NMI's which are logged against a user trapframe but nothing shows up in my profiling output.. it could be attributing it to the library/libraries instead of the process. Adrian -- Adrian Chadd - adrian@freebsd.org
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