I have the following in my rc.local file: -------------------- setpci -v -s 00:1f.1 LATENCY_TIMER=4 setpci -v -s 02:0e.0 LATENCY_TIMER=4 setpci -v -s 0b:07.0 LATENCY_TIMER=4 setpci -v -s 0c:08.0 LATENCY_TIMER=4 setpci -v -s 10:0d.0 LATENCY_TIMER=0 setpci -v -s 06:02.0 LATENCY_TIMER=ff echo 1 > /proc/irq/201/smp_affinity echo 1 > /proc/irq/217/smp_affinity echo 0 > /proc/irq/209/smp_affinity echo 1 > /proc/irq/14/smp_affinity --------------------- The last 4 lines set the CPU for the 4 PCI cards that I have with the most activity. My TDM Card, 2 NICs and a Raid Controller. It is a dual proc machine, so 0 is one CPU and 1 is the other. If you do these commands while irqbalance is still running, they will just get undone a few seconds later. irqbalance does the same as above, it just edits these files after determining the load on each CPU. -- -- Steven http://www.glimasoutheast.org "Email Lists" <lists06 at abbacomm.net> wrote in message news:00ab01c6cab7$4751ffe0$4001a8c0 at gxdt01... > > > -> Behalf Of Steven > -> Subject: [CentOS] Re: Does irqbalance actually do anything? > -> > -> My experience is that when switching CPUs for the IRQ Interrupts, it > -> introduces a delay. > -> In other words, each time it switches CPUs, I would lose interrupts. > -> > -> I am using CentOS for Telephony purposes, so eached dropped interrupts is > -> a potential problem. > -> > -> The first thing that I do on any CentOS box, is disable irqbalance and > -> set them CPUs manually. > -> > -> -- > -> -- > -> Steven > -> > > Would you please show and tell what you mean by "set the cpus manually" > after disabling irqbalance. > > Thanks in advance! > > - rh