On Wednesday 17 February 2010 1:09:04 pm Andrew Brampton wrote: > After reading though the kernel source I realise what I want isn't > implemented at the moment but I wanted to discuss if this feature > would be an useful addition. > > Basically I want to see counts of how many interrupts for a particular > interrupt have fired on each core. Linux has provided this kind of > information for a while and I've found it quite useful. I would like > this information when I am pinning particular interrupts to one (or > more cores). This is useful when I'm tweaking a system with, for > example, 10Gig network cards which have multiple queues (thus multiple > IRQs). > > Having a look in the kernel I see that the count is kept in the > is_count field of the intsrc struct. This field seems to be backed by > the global intrcnt array. Could this be modified to perhaps use the > new PCPU macros, so there is a different count for each core? If I was > given a few pointers I might find time to implement this myself.
The simplest method would probably be to make intrcnt grow per-CPU counts, but that would change the ABI of intrcnt and require a good bit of userland hacking to fix vmstat -i, etc. -- John Baldwin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
