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xen/intr: balance dynamic interrupts across available vCPUs

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By default Xen binds all event channels to vCPU#0, and FreeBSD only shuffles
the interrupt sources once, at the end of the boot process. Since new event
channels might be created after this point (because new devices or backends
are added), try to automatically shuffle them at creation time.

This does not affect VIRQ or IPI event channels, that are already bound to a
specific vCPU as requested by the caller.

Sponsored by: Citrix Systems R&D
This commit is contained in:
royger 2014-12-10 13:25:21 +00:00
parent f5723debac
commit 9d0e5e2b5e
1 changed files with 11 additions and 0 deletions
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11
sys/x86/xen/xen_intr.c
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@ -425,6 +425,17 @@ xen_intr_bind_isrc(struct xenisrc **isrcp, evtchn_port_t local_port,
/* Assign the opaque handler (the event channel port) */
*port_handlep = &isrc->xi_port;
#ifdef SMP
if (type == EVTCHN_TYPE_PORT) {
/*
* By default all interrupts are assigned to vCPU#0
* unless specified otherwise, so shuffle them to balance
* the interrupt load.
*/
xen_intr_assign_cpu(&isrc->xi_intsrc, intr_next_cpu());
}
#endif
if (filter == NULL && handler == NULL) {
/*
* No filter/handler provided, leave the event channel