On Wed, Dec 1, 2010 at 00:39, Raoufehsadat Hashemian Harandi <rhashem@xxxxxxxxxxx> wrote: > Yes, it is running, I also putted a heavy load with around 10000 interrupt > per second to see if it changes the number but the output is still like > this: may we see the content of /etc/sysconfig/irqbalance? who knows, there is a clue there... > The interesting point is that the value of affinity mask changes frequently, > when I set it to FFFFFFFF it is FF for some seconds and then it changes to > other values like 02 04 08 ! huh? dynamically changing affinity? weird... BTW, please kindly check http://lxr.linux.no/linux+v2.6.36/Documentation/ia64/IRQ-redir.txt, perhaps it would give another clue for your case PS: right now, IMHO, putting aside the "fact" that your affinitiy mask could change automatically somehow, I am guessing that the irq is handled that way due to some internal calculation. To make it short, I read somewhere that by sticking interrupt to a CPU core, it actually speed up response. of course, this is not always true for every situation, but kernel does exactly that at the first place. Also, by doing that, per cpu cache hotness would likely be maintained. Interrupt handler always running, L1/L2/L3 cache is effectively utilized....everybody happy :D -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
