linux-kernel - [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs justbecause there's no local APIC

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Date:	Fri, 19 Jun 2009 08:52:13 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Len Brown" <lenb@...nel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Xen-devel" <xen-devel@...ts.xensource.com>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs
	 justbecause there's no local APIC

>>> Yinghai Lu <yhlu.kernel@...il.com> 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.

Jan

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