From: James Lamanna <jlamanna@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Hardware Interrupt Balancing
Date: Wed, 24 Mar 2010 18:11:36 -0700 [thread overview]
Message-ID: <aa4c40ff1003241811p151a3aaakad1798c64ab29d24@mail.gmail.com> (raw)
Hi,
I have a Dual Xeon (single core each w/HT) machine and I noticed the
other day that interrupts are not
being balanced across the 2 processors:
CPU0 CPU1 CPU2 CPU3
0: 306 0 0 3254413993 IO-APIC-edge timer
1: 0 0 0 13468 IO-APIC-edge i8042
8: 0 0 0 3 IO-APIC-edge rtc
9: 0 0 0 0 IO-APIC-level acpi
12: 0 0 0 4 IO-APIC-edge i8042
169: 0 0 0 0 IO-APIC-level uhci_hcd:usb2
177: 0 0 0 16743166 IO-APIC-level ata_piix
185: 0 0 0 1 IO-APIC-level ehci_hcd:usb1
193: 0 0 0 0 IO-APIC-level uhci_hcd:usb3
201: 0 0 0 1867922172 IO-APIC-level eth0
209: 0 0 0 3254690559 IO-APIC-level wct4xxp
NMI: 1 0 0 0
LOC: 3255261535 3255261540 3255261549 3255220504
ERR: 0
MIS: 0
However the cpu_affinity of say, wct4xxp is:
# cat /proc/irq/209/smp_affinity
0000000f
Is there something (CPU Hotplug?) preventing the hardware interrupts
from being balanced across both CPUs?
The kernel version is 2.6.18 (i686) (this is an older machine that is
a PSTN<->SIP gateway).
Thanks.
-- James
Please CC me for I am not subscribed.
next reply other threads:[~2010-03-25 1:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-25 1:11 James Lamanna [this message]
2010-03-25 10:36 ` Alejandro Riveira Fernández
2010-03-29 20:14 ` James Lamanna
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