[ros-dev] [ros-diffs] [tkreuzer] 53695: [HAL] Implement lazy irql for APIC. This is useful for VMs, since APIC usually has high overhead due to the need of invoking the hypervisor on every irql raise and lower. With laz...

[Timo Kreuzer]

Am 12.09.2011 15:42, schrieb Alex Ionescu:
> http://blogs.technet.com/b/askperf/archive/2010/07/23/windows-xp-guests-exhibiting-poor-performance-when-running-under-vdi.aspx 
>
>
> Windows does have APIC Lazy IRQL, Microsoft are not idiots.
>

Windows has PIC lazy IRQL since Windows 2003, but APIC lazy IRQL only 
since Vista and only in SMP hals. And since we are targeting Win2003 and 
this is an UP hal, it is something that Windows doesn't have.

Regards,
Timo