Bug 154178 - re-enable tsc timer on x86_64
re-enable tsc timer on x86_64
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
x86_64 Linux
medium Severity medium
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Assigned To: Brian Maly
Brian Brock
Depends On:
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Reported: 2005-04-07 20:08 EDT by Christopher P Johnson
Modified: 2007-11-30 17:07 EST (History)
7 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2007-04-19 15:50:17 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Christopher P Johnson 2005-04-07 20:08:57 EDT
Description of problem:

The TSC timer was disabled in rhel 3. Please resolve the underlying
issues, and re-enable it. 

There are several opteron hardware platforms which do not provide HPET timer.
Customers require high-resolution timers for correct application behavior.

There are also platforms with problems with the HPET timer, where fallback
to TSC is required.

Note that sles8, sles9, and rhel4 all do not disable TSC.

Version-Release number of selected component (if applicable):

rhel 3 update 4
Comment 5 Jim Paradis 2005-04-27 16:15:51 EDT
Don, can you give your input as to whether this warrants a kernel fix or if the
workaround is satisfactory for the next release?
Comment 6 Jason Baron 2005-04-28 00:14:17 EDT
How can it be a workaround, if it doesn't work properly
Comment 7 Lee Whatley 2005-08-16 11:42:43 EDT
This still seems to be a problem as of Update 5.  What's the status?
Comment 8 Red Hat Bugzilla 2007-03-18 18:32:05 EDT
User jparadis@redhat.com's account has been closed
Comment 9 Brian Maly 2007-04-19 15:49:19 EDT
TSC was disabled at AMD's request on opteron based systems due to the fact it
cant safely be used with their PowerNow technology. PMTimer support was added to
RHEL3 to address this issue, and is the preferred timer on AMD based systems.

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