Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753870Ab0LHHp5 (ORCPT ); Wed, 8 Dec 2010 02:45:57 -0500 Received: from mail.agmk.net ([91.192.224.71]:42432 "EHLO mail.agmk.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753874Ab0LHHpz (ORCPT ); Wed, 8 Dec 2010 02:45:55 -0500 From: =?utf-8?q?Pawe=C5=82_Sikora?= To: Robert Hancock Subject: Re: [2.6.36.1] IGB driver handles all ethX interrupts on single cpu core. Date: Wed, 8 Dec 2010 08:45:49 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.36.1-3; KDE/4.5.4; x86_64; ; ) Cc: Linux Kernel Mailing List References: <201012071906.47161.pluto@agmk.net> <4CFEE2F9.90600@gmail.com> In-Reply-To: <4CFEE2F9.90600@gmail.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <201012080845.49604.pluto@agmk.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3228 Lines: 55 On Wednesday 08 of December 2010 02:44:25 Robert Hancock wrote: > On 12/07/2010 12:06 PM, Paweł Sikora wrote: > > hi, > > > > i'm currently testing a new server with 2x opteron-6128 with dual gigabit port > > and observing that the igb driver uses only single core for all ethX interrupts. > > is it a correct behaviour for this driver? > > > > BR, > > Pawel. > > The CPU affinity for the IRQ isn't really under the driver's control. It > looks like all your interrupts are being handled on CPU0. You likely > need to run the irqbalance daemon. ok, so why e.g. on one machine (dual amd opteron) irqbalance daemon is required and on second machine (single intel quad-core) irqs are balanced w/o daemon? this looks inconsistent to me. $ cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 49 2 0 0 IO-APIC-edge timer 1: 0 1 0 1 IO-APIC-edge i8042 8: 13 11 12 13 IO-APIC-edge rtc0 9: 0 0 0 0 IO-APIC-fasteoi acpi 12: 0 0 3 1 IO-APIC-edge i8042 16: 224 236 235 232 IO-APIC-fasteoi pata_marvell, uhci_hcd:usb3 17: 0 0 0 0 IO-APIC-fasteoi saa7133[0], saa7133[0] 18: 0 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb5, uhci_hcd:usb8 19: 695 672 660 630 IO-APIC-fasteoi uhci_hcd:usb7 21: 0 0 0 0 IO-APIC-fasteoi uhci_hcd:usb4 23: 1 1 1 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb6 40: 3409 3446 3441 3403 PCI-MSI-edge ahci 41: 63 60 60 61 PCI-MSI-edge hda_intel 42: 3219 3180 3237 3192 PCI-MSI-edge radeon 43: 505 487 496 498 PCI-MSI-edge eth0 NMI: 11 7 12 8 Non-maskable interrupts LOC: 14822 15293 17577 14404 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 11 7 12 8 Performance monitoring interrupts PND: 0 0 0 0 Performance pending work RES: 493 498 525 495 Rescheduling interrupts CAL: 3975 248 2729 299 Function call interrupts TLB: 937 1727 913 1600 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 2 2 2 2 Machine check polls ERR: 3 MIS: 0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/