Linux 2.6.17 running on the latest qemu snapshot is unable to route IRQs to more than 4 network interfaces when running without ACPI, and is limited to 2 network interfaces with ACPI enabled.
With 8 network interfaces and ACPI disabled, I get the following kernel output during boot: ne2k-pci.c:v1.03 9/22/2003 D. Becker/P. Gortmaker http://www.scyld.com/network/ne2k-pci.html PCI: Found IRQ 10 for device 0000:00:03.0 eth0: RealTek RTL-8029 found at 0xc100, IRQ 10, 52:54:00:12:34:56. PCI: Found IRQ 11 for device 0000:00:04.0 PCI: Sharing IRQ 11 with 0000:00:01.2 eth1: RealTek RTL-8029 found at 0xc200, IRQ 11, 52:54:00:12:34:57. PCI: Found IRQ 9 for device 0000:00:05.0 eth2: RealTek RTL-8029 found at 0xc300, IRQ 9, 52:54:00:12:34:58. PCI: Found IRQ 5 for device 0000:00:06.0 eth3: RealTek RTL-8029 found at 0xc400, IRQ 5, 52:54:00:12:34:59. eth4: RealTek RTL-8029 found at 0xc500, IRQ 11, 52:54:00:12:34:5A. eth5: RealTek RTL-8029 found at 0xc600, IRQ 9, 52:54:00:12:34:5B. eth6: RealTek RTL-8029 found at 0xc700, IRQ 11, 52:54:00:12:34:5C. eth7: RealTek RTL-8029 found at 0xc800, IRQ 9, 52:54:00:12:34:5D. The missing "Found IRQ" messages for eth4 through eth7 indicate that IRQs won't get routed properly. Indeed, later on the kernel emits complaints like: "irq 11: nobody cared ... Disabling IRQ #11". With 3 network interfaces and ACPI enabled, I get slightly different output: ne2k-pci.c:v1.03 9/22/2003 D. Becker/P. Gortmaker http://www.scyld.com/network/ne2k-pci.html PCI: Found IRQ 9 for device 0000:00:03.0 eth0: RealTek RTL-8029 found at 0xc100, IRQ 9, 52:54:00:12:34:56. PCI: Found IRQ 11 for device 0000:00:04.0 PCI: Sharing IRQ 11 with 0000:00:01.2 eth1: RealTek RTL-8029 found at 0xc200, IRQ 11, 52:54:00:12:34:57. PCI: Found IRQ 10 for device 0000:00:05.0 IRQ routing conflict for 0000:00:01.3, have irq 9, want irq 10 eth2: RealTek RTL-8029 found at 0xc300, IRQ 10, 52:54:00:12:34:58. piix4_smbus 0000:00:01.3: Found 0000:00:01.3 device piix4_smbus 0000:00:01.3: SMB base address uninitialized - upgrade BIOS or use force_addr=0xaddr Only eth0 and eth1 end up working. I suspect the problem in the non-ACPI case is caused by a limitation in the PCI IRQ routing table in the Bochs BIOS, but I haven't a clue how to fix it. Any ideas would be appreciated. --Ed _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel