On 18/12/06 5:28 am, "Xu, Anthony" <anth...@intel.com> wrote:
If there is no special handling, low privileged interrupt may
"interrupt" high privileged interrupt.
There's no concept of privilege among event channels. Since Xen simply
allocates ExtInts to vectors in a round-robin manner, there is no meaningful
priority comparsion to be made between vectors anyway.
BTW,
I do see evtchn_callback reentry happen on IPF dom0, and that incur
about 5% performance degradation
with KB on VTI-domain compared to non_reentry.
KB == Keyboard?!
Reentry is allowed -- it shouldn't happen often unless the ISRs are really
long (bad) or we are hammering the interrupt line for some reason (bad).
-- Keir
9 messages in com.xensource.lists.xen-ia64-develRe: [Xen-devel] Question about evtchn...