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xen-devel
RE: [Xen-devel] [PATCH] new hvm platform vhpet enable parameter
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To: |
"dan.magenheimer@xxxxxxxxxx" <dan.magenheimer@xxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [PATCH] new hvm platform vhpet enable parameter |
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From: |
"Stephen C. Tweedie" <sct@xxxxxxxxxx> |
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Date: |
Fri, 08 Feb 2008 12:50:34 +0000 |
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"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Fri, 08 Feb 2008 04:51:08 -0800 |
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Hi,
On Thu, 2008-02-07 at 11:29 -0700, Dan Magenheimer wrote:
> If Linux were using it as a timekeeping source, I think it would
> be (per earlier post by Dave Winchell), but on second look once
> HPET is disabled, Linux discovers pmtimer but still uses PIT/TSC
> based timekeeping.
Just one word of warning --- the Linux handling of PIT vs HPET vs
pmtimer has changed a lot over the years, and you might well find older
kernels handling these cases differently. (I can't recall exact details
but I do remember seeing long discussions about the merits of the
different timers in different cases.)
--Stephen
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