From: Arjan van de Ven <arjan@infradead.org>
To: "Robert M. Stockmann" <stock@stokkie.net>
Cc: linux-kernel@vger.kernel.org, Randy Dunlap <rddunlap@osdl.org>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
Andre Hedrick <andre@linux-ide.org>,
Manfred Spraul <manfreds@colorfullife.com>,
Alan Cox <alan@redhat.com>, Kamal Deen <kamal@kdeen.net>
Subject: Re: irqbalance mandatory on SMP kernels?
Date: Mon, 17 Apr 2006 15:10:22 +0200 [thread overview]
Message-ID: <1145279422.2847.44.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0604171438490.14894-100000@hubble.stokkie.net>
> [jackson:stock]:(/usr/src/linux)$ cat /proc/interrupts
> CPU0 CPU1
> 0: 3139568 0 IO-APIC-edge timer
> 1: 8923 0 IO-APIC-edge i8042
> 3: 10 0 IO-APIC-edge serial
> 4: 37 0 IO-APIC-edge serial
> 8: 0 0 IO-APIC-edge rtc
> 9: 240 0 IO-APIC-level acpi
> 12: 75316 0 IO-APIC-edge i8042
> 14: 64291 0 IO-APIC-edge ide0
> 15: 64291 0 IO-APIC-edge ide1
> 16: 235408 0 IO-APIC-level HiSax, nvidia
> 17: 15823 0 IO-APIC-level libata, AMD AMD8111
> 19: 241 0 IO-APIC-level ohci_hcd, ohci_hcd, ohci1394
> 24: 50761 0 IO-APIC-level eth0
> NMI: 89 28
> LOC: 3139042 3139125
> ERR: 0
> MIS: 0
> [jackson:stock]:(/usr/src/linux)$
this may or may not be a problem depending on how long a time you used
to collect this. Based on your timer tick count it really looks like
your irq rates are so low that it really doesn't matter much
>
> Only when firing up the irqbalance util at boot time will activate
> true SMP, distributing IRQ's across CPU's. Is this on purpose?
> Because afaik a Linux SMP kernel, 2.4.xx or 2.6.xx should always
> result in distributed IRQ loads across CPU's.
that is a chipset feature if it happens; not all chipsets do this (and
most that do, do it badly).
I'm not sure what your actual problem is btw, the irqbalance tool is
supposed to automatically start at boot, did it not do that ?
(and no the kernel doesn't need to do everything, something like this
can perfectly well be done in userspace as irqbalance shows)
next prev parent reply other threads:[~2006-04-17 13:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-17 13:00 Robert M. Stockmann
2006-04-17 13:10 ` Arjan van de Ven [this message]
2006-04-17 14:15 ` Robert M. Stockmann
2006-04-17 14:23 ` Arjan van de Ven
2006-04-17 14:31 ` Martin J. Bligh
2006-04-17 15:01 ` Lee Revell
2006-04-18 16:35 ` Theodore Ts'o
2006-04-18 17:42 ` Stephen Hemminger
2006-04-18 17:53 ` Martin Bligh
2006-04-18 18:19 ` Arjan van de Ven
2006-04-19 12:42 ` Erik Mouw
2006-04-19 14:23 ` Arjan van de Ven
2006-04-19 14:38 ` Theodore Ts'o
2006-04-19 14:45 ` Arjan van de Ven
2006-04-20 7:43 ` Nick Piggin
2006-04-19 14:30 ` Martin J. Bligh
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