On 4/4/06, William L. Maltby <BillsCentOS at triad.rr.com> wrote: > On Tue, 2006-04-04 at 10:28 -0400, lnthai2002 at aim.com wrote: > > After updating to centos 4.3, I notice a failure in terminating > > irqbalance whenever i shutdown the system. Checking the services after > > the system reboot i see the error in irqbalance: > > "irqbalance dead but subsys locked" > > Can anyone tell me what irqbalance is As the other person said it distrubutes IRQ's across multiple processors in an SMP system. You don't want to disable this as it will impact system performance. Just as a quick explanation, by default all of the IRQ's (the signals that let hardware devices notify the cpu and by extension device drivers know that they need servicing) end up on one processor (at least on Intel like architectures). The OS though can balance them across muliple processors which is typically more efficient (share the load sort of thing). I don't know the algorithms that irqbalance uses to distribute the IRQ's but it definately makes things more efficient. So again you don't want to disable this (unless your on a single processor machine, and then its a moot point; in this case disable away using chkconfig). What I would sugest is filing a bugzilla report at bugzilla.redhat.com. Cheers...james