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Re: [Qemu-devel] Re: Precise guest instruction count.
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] Re: Precise guest instruction count. |
Date: |
Wed, 11 Mar 2009 13:13:20 +0000 |
User-agent: |
KMail/1.9.9 |
> By turning of all timers in Qemu I hope to disable all timer interrupts for
> the guest. The results I get are not correct for the first time the code is
> run, but for all subsequent runs. In the first run, the instruction count
> has 12 additional instructions, which are not actually executed.
>
> What is the cause of those additional instructions?
Probably you're not reading the correct value. Like I said, for performance
reasons the counter is only valid at certain points.
Try instead implementing your timer as a peripheral.
Paul
Re: [Qemu-devel] Precise guest instruction count., Paul Brook, 2009/03/09