From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MgZWn-0003hC-5h for qemu-devel@nongnu.org; Thu, 27 Aug 2009 03:36:13 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MgZWi-0003bY-4v for qemu-devel@nongnu.org; Thu, 27 Aug 2009 03:36:12 -0400 Received: from [199.232.76.173] (port=58005 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MgZWi-0003bR-1J for qemu-devel@nongnu.org; Thu, 27 Aug 2009 03:36:08 -0400 Received: from mx20.gnu.org ([199.232.41.8]:17735) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1MgZWh-0000Tb-Hs for qemu-devel@nongnu.org; Thu, 27 Aug 2009 03:36:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]) by mx20.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1MgZWg-0004F0-R8 for qemu-devel@nongnu.org; Thu, 27 Aug 2009 03:36:07 -0400 Message-ID: <4A96375D.1070005@redhat.com> Date: Thu, 27 Aug 2009 09:35:57 +0200 From: Gerd Hoffmann MIME-Version: 1.0 Subject: Re: [Qemu-devel] [PATCH 2/2] Route IOAPIC interrupts via ISA bus References: <1249836296-13288-1-git-send-email-avi@redhat.com> <1249836296-13288-3-git-send-email-avi@redhat.com> <4A955CB4.4080205@redhat.com> <4A955D6A.9060804@redhat.com> <4A95633E.7060703@redhat.com> <4A961161.5030906@redhat.com> In-Reply-To: <4A961161.5030906@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel@nongnu.org >> BTW: Seems linux doesn't use IRQ 5 even with lots of PCI devices, >> instead it makes them share 10+11 ... > > We could change the defaults to include 5, but maybe it makes more sense > to fix Linux to distribute active PCI IRQs across the resources it has > at its disposal. i.e. Linux decides to stick with the defaults (starred) here ... ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11) ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11) ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11) ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11) ... instead of trying to minimize IRQ sharing by using IRQ 5? > They'll be slow regardless. I should be easy to support msi on e1000 > though. What is needed on the guest side? Looks like even 2.6.30 doesn't use MSI for virtio-net ... cheers, Gerd