On 03/12/2025 15:17, Kapetanakis Giannis wrote:
Hi, Is there a limit on number of vio devices? This is my 13th vio device virtio16 at pci0 dev 19 function 0 "Qumranet Virtio Network" rev 0x00 vio12 at virtio16: 4 queues, address 00:1a:4a:34:9f:60 failed to allocate interrupt slot for PIC msix pin -2147444734 vio12[2]: couldn't establish msix interrupt vio12: cannot alloc q0 intr: 12 virtio16: virtio configuration failed
On 03/12/2025 16:02, Crystal Kolipe wrote:
Not exactly a limit on vio devices - in this case you seem to be exceeding the number of available interrupt vectors.
On 03/12/2025 16:33, Kapetanakis Giannis wrote:
Is this tunable (sysctl) or does it need a custom kernel? probably something bigger... the fail comes from intr.c: intr_allocate_slot() which (to my reading is limited by MAX_INTR_SOURCES) /* * Maximum # of interrupt sources per CPU. 64 to fit in one word. * ioapics can theoretically produce more, but it's not likely to * happen. For multiple ioapics, things can be routed to different * CPUs. */ #define MAX_INTR_SOURCES 64 #define NUM_LEGACY_IRQS 16
And it seems that this came from vio multiques.
Each vio now has 4 queues and got hit by that hard limit
vmstat -i | grep vio|wc -l
62
G
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