Date: Thu, 29 Nov 2007 09:49:53 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Joseph Koshy <jkoshy@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/hwpmc hwpmc_x86.c Message-ID: <474E7D31.3000904@FreeBSD.org> In-Reply-To: <200711290643.lAT6hxDS004790@repoman.freebsd.org> References: <200711290643.lAT6hxDS004790@repoman.freebsd.org>
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Joseph Koshy wrote: > jkoshy 2007-11-29 06:43:59 UTC > > FreeBSD src repository > > Modified files: > sys/dev/hwpmc hwpmc_x86.c > Log: > Revert revision 1.4. > > Intel CPUs with family 0x6, model 0xE and later (i.e., Intel Core(TM)) > have a PMC architecture that differs somewhat from previous CPUs in > family 0x6. Even though the basic programming model is similar, the > documented set of legal values that may be loaded into their PMC MSRs > differs from that of the previous PMCs in family 0x6 and reusing bit > values valid for the older PMCs could result in undefined behaviour in > the general case. > > Revision Changes Path > 1.6 +1 -1 src/sys/dev/hwpmc/hwpmc_x86.c What is your expected timeline for fixing this and the other missing CPU family support (Intel Woodcrest, etc)? It's a serious limitation to not be able to run hwpmc on modern CPUs, and I argue that a partial implementation is much better than no implementation. Kris
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