Which patches did you use for the interrupt balancing? Do you
have a URL to them? I would like to try them out also.
On Fri, 4 Apr 2003, HABBINGA,ERIK (HP-Loveland,ex1) wrote:
> Date: Fri, 4 Apr 2003 12:01:20 -0500
> From: "HABBINGA,ERIK (HP-Loveland,ex1)" <erik.habbinga@xxxxxx>
> To: 'Steve Lord' <lord@xxxxxxx>
> Cc: "'linux-xfs@xxxxxxxxxxx'" <linux-xfs@xxxxxxxxxxx>
> Subject: RE: xfslogd on SMP systems
> > It is being reworked. The threads handle I/O completion on a per cpu
> > basis, interrupts hand work off to the thread on the same cpu. Xeons
> > deliver all their interrupts to cpu 0 by default, so all the work
> > goes one place. Ask intel about this one.
> > If you actually have multiple controllers involved then you can
> > get hold of irqbalance which will distribute the interrupts from
> > different controllers around the cpus.
> > This xeon issue is why we decided to rework this.
> I already have kernel patches that redistribute the irq's from our storage
> controllers across all cpus. Here's some output from /proc/interrupts:
> 0: 56540 57588 57045 56213 IO-APIC-edge timer
> 16: 810276 788003 778844 770226 IO-APIC-level lpfcdd
> 18: 818436 797352 795307 787978 IO-APIC-level lpfcdd
> I can't find any good description of irqbalance, but it looks to do the same
> thing in a user space daemon. With those kernel patches, xfslogd/0 is still
> the only process consuming CPU time. Is there something else I should check
> or try?
> > Steve
> > --
> > Steve Lord voice: +1-651-683-3511
> > Principal Engineer, Filesystem Software email: lord@xxxxxxx