Date: Mon, 10 May 1999 18:54:53 -0700 (PDT) From: Alan Cox <alc@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 perfmon.c Message-ID: <199905110154.SAA06341@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
alc 1999/05/10 18:54:53 PDT
Modified files:
sys/i386/i386 perfmon.c
Log:
The Intel Pentium Pro's performance counters are 40 bits wide. The Intel
manuals specifically say that reading the counters using the rdmsr
instruction returns a 64 bit value of which the higher 24 bits are
undefined. The code that reads the counters should then clear the
high 24 bits.
PR: i386/10632
Revision Changes Path
1.18 +3 -3 src/sys/i386/i386/perfmon.c
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199905110154.SAA06341>