[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs justbecause there's no local APIC
On Fri, Jun 19, 2009 at 1:16 AM, Eric W. Biederman<ebiederm@xxxxxxxxxxxx> wrote: > "Jan Beulich" <JBeulich@xxxxxxxxxx> writes: > >>>>> Yinghai Lu <yhlu.kernel@xxxxxxxxx> 19.06.09 07:32 >>> >>>doesn't XEN support per cpu irq vector? >> >> No. >> >>>got sth from XEN 3.3 / SLES 11 >>> >>>igb 0000:81:00.0: PCI INT A -> GSI 95 (level, low) -> IRQ 95 >>>igb 0000:81:00.0: setting latency timer to 64 >>>igb 0000:81:00.0: Intel(R) Gigabit Ethernet Network Connection >>>igb 0000:81:00.0: eth9: (PCIe:2.5Gb/s:Width x4) 00:21:28:3a:d8:0e >>>igb 0000:81:00.0: eth9: PBA No: ffffff-0ff >>>igb 0000:81:00.0: Using MSI-X interrupts. 4 rx queue(s), 4 tx queue(s) >>>vendor=8086 device=3420 >>>(XEN) irq.c:847: dom0: invalid pirq 94 or vector -28 >>>igb 0000:81:00.1: PCI INT B -> GSI 94 (level, low) -> IRQ 94 >>>igb 0000:81:00.1: setting latency timer to 64 >>>(XEN) physdev.c:87: dom0: map irq with wrong vector -28 >>>map irq failed >>>(XEN) physdev.c:87: dom0: map irq with wrong vector -28 >>>map irq failed >>> >>>the system need a lot of MSI-X normally.. with current mainline tree >>>kernel, it will need about 360 irq... >> >> Do you mean 360 connected devices, or just 360 IO-APIC pins (most of >> which are usually unused)? In the latter case, devices using MSI (i.e. not >> using high numbered IO-APIC pins) should work, while devices connected >> to IO-APIC pins numbered 256 and higher won't work in SLE11 as-is. >> This limitation got fixed recently in the 3.5-unstable tree, though. The >> 256 active vectors limit, however, continues to exist, so the former case >> would still not be supported by Xen. 5 io-apic controllers, so total pins like 5x24 > > Good question. I know YH had a system a few years ago that exceeded 256 > vectors. that was in SimNow. This time is real. think about system: 24 pcie cards and every one has two functions. and one function will use 16 or 20 MSIX like 24 * 2 * 16 YH _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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