NIC interrupt assignments under UltraSPARC-T1

From time to time I "play" with netperf on different systems. I happen to have occasion to play with a T2000. Under Solaris 10 I am able to coerce the interrupts of the different core GbEs to be on different cores rather than strands of the same core.

Under a 2.6.15 kernel (Ubuntu Dapper) it would appear that the old standby of "echo affinity mask to the IRQ" doesn't "work" - no matter how I change the mask for a NIC, running a netperf TCP_RR test seems to show the interrupts happening on the same strand.

Is it indeed not possible to alter the interrupt assignments or have I (as I'm wont to do) missed something quasi-obvious?

thanks,

rick jones

From: Rick Jones <[email protected]>
Date: Wed, 13 Sep 2006 17:47:27 -0700

It should work, perhaps there is a bug somewhere.

I think it's a bad idea, btw, to asking sparc port questions on the netdev list :-) sparclinux@vger would be a much better place.

I'm travelling currently, and won't be back until next week, so I have no way to plug in and power on my T1000 machine to try and diagnose this. Please try and debug this yourself by poking around in arch/sparc64/kernel/irq.c where this is supposed to be happening.

Thanks.