I'm using the latest vanilla linux-next kernel. Rgds, Heiner Am 28.10.2014 um 13:10 schrieb Lucas Stach: > Am Montag, den 27.10.2014, 20:16 +0100 schrieb Heiner Kallweit: >> Thanks, Lucas. >> >> It's interesting however that the igb driver claims it's using MSI-X. >> Maybe the DW PCIE drivers offers MSI-X on the bus and just internally falls back to MSI? >> > Are you running a upstream or downstream vendor kernel? > On my upstream kernel igb properly falls back to MSI. > > Regards, > Lucas > >> Rgds, Heiner >> >> [ 4.165850] igb: Intel(R) Gigabit Ethernet Network Driver - version 5.2.15-k >> [ 4.172930] igb: Copyright (c) 2007-2014 Intel Corporation. >> [ 4.178638] igb 0000:01:00.0: enabling device (0140 -> 0142) >> [ 4.235789] igb 0000:01:00.0: added PHC on eth0 >> [ 4.235793] igb 0000:01:00.0: Intel(R) Gigabit Ethernet Network Connection >> [ 4.235799] igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x1) 00:01:c0:14:b1:58 >> [ 4.235804] igb 0000:01:00.0: eth0: PBA No: FFFFFF-0FF >> [ 4.235810] igb 0000:01:00.0: Using MSI-X interrupts. 2 rx queue(s), 2 tx queue(s) >> >> >> Am 27.10.2014 um 09:52 schrieb Lucas Stach: >>> Hello Heiner, >>> >>> Am Sonntag, den 26.10.2014, 19:05 +0100 schrieb Heiner Kallweit: >>>> I use a mini pc with i.mx6 dual and Intel igb based nic (I211) connected via PCIE. >>>> igb driver uses MSI-X and creates two rx/tx queue pairs. However the IRQs of all queues are handled by the same CPU. >>>> Changing affinity is not possible. Obvious direct reason is that irq_chip PCI-MSI doesn't implement the callback >>>> for setting cpu affinity. >>>> I'd appreciate a hint whether this is a general limitation of the Cortex-A9 / GICv1 / Synopsys Designware >>>> architecture or whether just a proper implementation is missing yet. >>>> >>>> Rgds, Heiner >>> >>> The MSI controller on imx6 doesn't support MSI-X so igb falls back to >>> regular MSI interrupts. Also all MSI interrupts are aggregated into a >>> single GIC interrupt line. This means the best we could do is switch all >>> PCIe MSI interrupts to some other CPU. Configuring the CPU affinity on a >>> per interrupt basis is impossible on this hardware. >>> >>> Regards, >>> Lucas >>> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-pci" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
