[syslinux] "Tick-counting" vs "Tick-less" timekeeping issues on VMs emulating BIOS PCs

[H. Peter Anvin]

On March 2, 2016 3:45:14 PM PST, Michael Brown <mcb30 at ipxe.org> wrote:
>On 02/03/16 22:47, Patrick Masotta via Syslinux wrote:
>> Not really, a virtual environment can easily emulate the
>BIOS_timer	at 0x046C
>> but it has problems emulating a "real" timer interrupt to be
>hooked...
>> That's the real problem.
>
>The timer interrupt works fine in at least KVM, Xen, VMware, and 
>Hyper-V.  (I've tested iPXE in all of those virtual environments, and 
>iPXE relies on the timer interrupt actually triggering a call to an ISR
>
>within the VM.)
>
>Michael

And the document you link to states so.
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