Re: Per core, per device interrupt counts
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
Re: Per core, per device interrupt counts
- Original Message From: John Baldwin j...@freebsd.org To: freebsd-hackers@freebsd.org Cc: Andrew Brampton brampton+free...@gmail.com Sent: Wed, February 17, 2010 4:17:24 PM Subject: Re: Per core, per device interrupt counts 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. Or he can add some DTrace SDT probes after intrctl gets updated and export the device name, cpu index and count number from there as the probe argument list. Then he can get the stats he wants from a D script Solaris' intrstat is built as a DTrace consumer, IIRC Fer ___ 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
