DragonFly commits List (threaded) for 2012-03
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git: DragonFly_RELEASE_3_0 kernel - Add workaround for errata #721 on AMD cpus (found by Matt Dillon)
commit c6f37fc2ab41918c5d344ea3086df799db85bb34
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri Mar 23 15:49:54 2012 -0700
kernel - Add workaround for errata #721 on AMD cpus (found by Matt Dillon)
* Official reference for errata 721:
http://support.amd.com/us/Processor_TechDocs/41322_10h_Rev_Gd.pdf
* This is the cpu bug found by Matthew Dillon, present on all K10 cores
(so far). AMD has indicated that the bug is not present on Bulldozer
cpus.
* The MSR workaround is now reported and programmed during kernel boot.
* No discernable difference in performance was detected running GCC
with and without the MSR adjustment.
* Verified to have fixed our test case w/GCC. It no longer seg-faults.
Summary of changes:
sys/platform/pc64/x86_64/initcpu.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c6f37fc2ab41918c5d344ea3086df799db85bb34
--
DragonFly BSD source repository
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