[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Para-Virtualized Clock Usage
|
From: |
Gleb Natapov |
|
Subject: |
Re: [Qemu-devel] Para-Virtualized Clock Usage |
|
Date: |
Tue, 23 Apr 2013 08:52:16 +0300 |
On Mon, Apr 22, 2013 at 04:58:01PM +0000, Joji Mekkattuparamban (joji) wrote:
> Greetings,
>
> I have a SMP guest application, running on the 2.6.27 Linux kernel. The
> application, originally written for bare metal, makes extensive use of the
> TSC, by directly invoking rdtsc from the user space for timestamp purposes.
> While running on KVM (RHEL version 6.3), we are running into TSC issues on
> some hardware. As a solution, I am considering migrating to the pvclock. I am
> wondering if there is an example for migrating from TSC to the pvclock. Any
> pointers?
>
Wrong list, you should ask KVM (copied). Recent kernels have pvclock
vdso support which means that gettimeofday() uses it without entering
the kernel. Marcelo?
--
Gleb.