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Re: Query regarding interrupts on a dual core machine
Hi,
On 8/2/06, Usman S. Ansari <uansari@xxxxxxxxx> wrote:
> After going through the BIOS menu, I couldn't see that it had multi
> threading support. Hence this parameter was set to 2. Anyways, even after
> setting this to 4, the result is the same. All interrupts are delivered to
> CPU0.
>
>
> Do you have irqbalance running ?
>
I have the following setting in config file
>CONFIG_IRQBALANCE=y
>Shouldn't this suffice?
No. There is user level deamon too.
On FCs
service irqbalance start
chkconfig irqbalance on [for auto starting]
Thanks for the information. After running I can now see that the
count of interrupt
increases on CPU1 as well. However, I am curious now since from the man page of
irqbalance I see
"The purpose of irqbalance is distribute hardware interrupts across
processors on a multiprocessor system in order to increase
performance. It is useful mostly just
for 2.4 kernels, or 2.6 kernels with CONFIG_IRQBALANCE turned off."
I tried this on another dual XEON processor machine(kernel 2.6.13). On
this machine I can see from /proc/interrupts that interrupts are
distributed on both processors. But irqbalance is _not_ running on
this second machine. The kernel config file is almost same as on my
dual core machine. I am confused now.
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