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Old 02-25-2008, 06:41 AM   #1
harikrishnan81
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Registered: Jan 2008
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Question BIOS BUG: CPU#0 improperly initialized, has 317 usecs TSC skew! FIXED.


Hi all ,
I have a server class m/c with "KFN4-DRE" motherboard and "Dual-Core AMD Opteron(tm) Processor 2216" and Red Hat Enterprise Linux ES release 3 (Taroon Update 6) os.While booting the system i used to get a message as
BIOS BUG: CPU#0 improperly initialized, has 317 usecs TSC skew! FIXED.
BIOS BUG: CPU#1 improperly initialized, has 317 usecs TSC skew! FIXED.
BIOS BUG: CPU#2 improperly initialized, has -317 usecs TSC skew! FIXED.
BIOS BUG: CPU#3 improperly initialized, has -317 usecs TSC skew! FIXED.

And i will come up after this.
Can any one help me to resolve this problem?

Thanks in advance ..
Hari
 
Old 02-25-2008, 02:12 PM   #2
H_TeXMeX_H
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Registered: Oct 2005
Location: $RANDOM
Distribution: slackware64
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Usually, when it says "BIOS BUG" it indicates a BIOS bug. Have you tried updating the BIOS if possible ?

But, I think there is a fix for it, and this message tells you that the problem has been fixed or handled by the kernel without incident.

See the wiki an time stamp counter:
http://en.wikipedia.org/wiki/Time_Stamp_Counter

And this article:
http://lkml.org/lkml/2005/11/4/173

Quote:
Current AMD Opteron(tm) and Athlon(tm)64 processors provide
power management mechanisms that independently adjust the
performance state ("P-state") and power state ("C-state") of
the processor[1][2]; these state changes can affect a
processor core's Time Stamp Counter (TSC) which some
operating systems may use as a part of their time keeping
algorithms. Most modern operating systems are well aware of
the effect of these state changes on the TSC and the
potential for TSC drift[3] across multiple processor cores
and properly account for it. Although cores may drift with
respect to one another, an individual core's TSC is always
monotonically increasing. This drift can *not* occur on
single-processor single-core platforms.

Last edited by H_TeXMeX_H; 02-25-2008 at 02:15 PM.
 
Old 02-26-2008, 02:51 AM   #3
harikrishnan81
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Registered: Jan 2008
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Hi htexmexh,
Thnaks for the quick help.
Regards,
Hari
 
  


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