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.