From: "Robert Falk" <amon@mindkiller.com>
To: Qemu-devel@nongnu.org
Subject: [Qemu-devel] PIT clock count
Date: Tue, 27 Jun 2006 10:45:16 +0200 [thread overview]
Message-ID: <WorldClient-F200606271045.AA45160044@mindkiller.com> (raw)
Hi,
we are developing an x86 application that we are testing using qemu and
are having some issues with the PIT clock count. We are using PIT clock
count as a reference to measure cpu frequency:
wait_wrap()
a=read_current_cycles()
wait_wrap()
b=read_current_cycles()
calculate_freq(a,b)...
The problem is that when running in qemu it sometimes "loops twice" in the
wrap wait, thus reporting twice the cycles. The same problem occurs
whether I am running 100Hz or 1000Hz.
Is this a known bug? And is there any solution? I recall I have seen
similar problems with VMWare and Linux.
reply other threads:[~2006-06-27 8:48 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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