From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Filip Navara <filip.navara@gmail.com>
Subject: Re: [Qemu-devel] Performance counter
Date: Mon, 10 Sep 2007 16:15:22 +0100 [thread overview]
Message-ID: <200709101615.23250.paul@codesourcery.com> (raw)
In-Reply-To: <5b31733c0709100146jf4f22f6l900dc55edf38f9d0@mail.gmail.com>
> > I'm using qemu at the moment to run a system for debugging purposes. I
> > was wondering whether qemu does actually emulate the performance
> > counters on IA32. Every time i try to read the value out, it
> > consistently gives me zero even though i have written to the given model
> > specific register.
>
> the performance registers aren't implemented on QEMU.
QEMU is not cycle accurate, nor does it emulate memory caches or have an
accurate TLB model, so I'm fairly sure we do can have provide meaningful
values for most of the counters.
Paul
prev parent reply other threads:[~2007-09-10 15:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-10 1:49 [Qemu-devel] Performance counter Peter Nguyen
2007-09-10 8:46 ` Filip Navara
2007-09-10 15:15 ` Paul Brook [this message]
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