Messages in this thread | | | Date | Tue, 10 Jan 2006 23:14:06 +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: > Jesper Juhl wrote: > > 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? > > Is it HT? ISTR it was intelligent enough to ignore that. But you'd > have to look at the code to be sure. > Dual Core Athlon 64 X2 4400+
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