Messages in this thread | | | Date | Tue, 10 Jan 2006 23:10:22 +0100 | From | Jesper Juhl <> | Subject | Re: Although CONFIG_IRQBALANCE is enabled IRQ's don't seem to be balanced very well |
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On 1/10/06, Martin Bligh <mbligh@mbligh.org> wrote: > Josef Sipek wrote: > > On Tue, Jan 10, 2006 at 12:14:42PM +0100, Jesper Juhl wrote: > > > >>Do I need any userspace tools in addition to CONFIG_IRQBALANCE? > > > > > > Last I checked, yes you do need "irqbalance" (at least that's what > > the package is called in debian. > > Nope - you need the kernel option turned on OR the userspace daemon, > not both. > Ok, good to know.
> If you're not generating interrupts at a high enough rate, it won't > rotate. That's deliberate. >
Hmm, and what would count as "a high enough rate"?
I just did a small test with thousands of ping -f's through my NIC while at the same time giving the disk a good workout with tons of find's, sync's & updatedb's - that sure did drive up the number of interrupts and my load average went sky high (amazingly the box was still fairly responsive):
root@dragon:/home/juhl# uptime 22:59:58 up 12:43, 1 user, load average: 1015.48, 715.93, 429.07
but, not a single interrupt was handled by CPU1, they all went to CPU0.
Do you have a good way to drive up the nr of interrupts above the treshhold for balancing?
-- Jesper Juhl <jesper.juhl@gmail.com> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html - 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/
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