From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dimitri Puzin Subject: smp_affinity weirdness in LK 2.6.14 Date: Sat, 05 Nov 2005 14:04:01 +0100 Message-ID: <436CADC1.205@ddkom-online.de> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-smp-owner@vger.kernel.org List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-smp@vger.kernel.org Hello, I found that I cannot change IRQ affinity in the 2.6.14 kernel. It works however on the 2.6.13.4 and earlier. 2.6.13.4: # cat /proc/irq/189/smp_affinity 1 # echo 2 > /proc/irq/189/smp_affinity # cat /proc/irq/189/smp_affinity 2 # 2.6.14: # cat /proc/irq/189/smp_affinity 1 # echo 2 > /proc/irq/189/smp_affinity # cat /proc/irq/189/smp_affinity 1 # /proc/interrupts is also showing that all all IRQs are bound to CPU0. I must add, that this system is a P4 with HyperThreading support. I've tried both with CONFIG_IRQBALANCE=y and n but the result is always the same. With the new kernel I cannot balance the IRQs neither by hand, nor userspace/kernel tools. Is that normal? Regards -Dimitri