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Re: [Xen-devel] softtsc for PV guests
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] softtsc for PV guests |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Fri, 21 Aug 2009 16:02:18 -0700 |
| Cc: | "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 21 Aug 2009 16:02:54 -0700 |
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On 08/21/09 15:17, Dan Magenheimer wrote:
> I'm starting to play with implementing softtsc for
> PV guests, but am not adequately familiar with the low
> level x86 instruction set or emulation code in Xen.
>
> The attached patch seems to work fine for awhile.
> Dom0 begins the boot process and the printk added
> to traps.c observes more than 256K TSC traps (mostly
> in the BogoMIPS calculation) and continues on loading
> drivers etc but eventually freezes after:
>
The Xen clocksource uses rdtsc extensively for timing; emulating it
would be a bad idea. I guess it would make some sense to emulate
usermode rdtsc, but it shouldn't affect kernel rdtscs.
> device-mapper: ioctl: 4.7.0-ioctl (2006-06-24) initialised:
> dm-devel@xxxxxxxxxx
> kjournald starting. Commit interval 5 seconds
> EXT3-fs: mounted filesystem with ordered data mode.
>
> Any ideas on what might be stopping the dom0 boot?
>
How dead is the system? Does it respond to sysrq-p? 'q' or '0' on the
Xen console?
J
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