Thanks so much for the detailed info. It's very comprehensive. Thanks for taking the time. On Sep 26, 2011, at 6:51 AM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > On Fri, Sep 16, 2011 at 5:08 AM, Kernel Piddu <kernelpiddu@xxxxxxxxx> wrote: >> >>> I have a multi processor system/machine and I would like dedicate a CPU entirely to listen on to a port. >>> I would greatly appreciate if you could tell me how this can be done. >>> >>> Thanks! >> > > doing this in the kernel, is perhaps not really recommended, and linux > kernel is become UNIX-non-compliant if such features were ever > provided. > but userspace, is definitely possible, but is always a suggestive > tuning....the kernel can always override your request: > http://www.cyberciti.biz/tips/setting-processor-affinity-certain-task-or-process.html > but this is per-process, if u want per-port IRQ handling attach to the > core, then this is going to affect the algorithm kernel used for > SoftIRQ handling: > > doing a "cat /proc/softirqs" on my system: > > CPU0 CPU1 CPU2 CPU3 > HI: 0 0 0 0 > TIMER: 563854 591025 0 0 > NET_TX: 7 6 0 0 > NET_RX: 17486 19250 0 0 > BLOCK: 28888 3784 0 0 > BLOCK_IOPOLL: 0 0 0 0 > TASKLET: 399230 391008 0 0 > SCHED: 116858 119604 0 0 > HRTIMER: 978 610 0 0 > RCU: 158513 192567 0 0 > > i can see that the IRQ processing is skewed, but then unless i have an > overall picture of what every core is doing.....not advisable to touch > that. > > anyway looking at the "processes": > > root 3 2 0 16:59 ? 00:00:00 [ksoftirqd/0] > root 7 2 0 16:59 ? 00:00:00 [ksoftirqd/1] > > only two tasklet thread are spawned to handle the these softirq at > each core. i suspect some error in the interpreting the number of > cores here, as there is only two core. (/proc/cpuinfo). > > good reading on these internals: > > http://lwn.net/Articles/308117/ > http://www.wil.cx/matthew/lca2003/paper.pdf > > -- > Regards, > Peter Teoh _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
