Krgopi, The card I am using is Broadcom NetXtreme II Gigabit Ethernet Driver v2.8.5. Is it GLDv3-based NIC? The OS is SNV-46 on Intel.
I set ip_squeue_fanout to 1, but still see the high interrupt rate on one CPU on my test system. Moreover, I read a slides about NEMO improvement throughput, how can I tell NEMO is at work? Thanks, Andrew On Tue, 2006-10-17 at 10:13 -0700, Rajagopal Kunhappan wrote: > Hi Andrew, > > Hi, > > > > I have a four-CPU system with two G-NICs. The system acts as an > > application gateway, and the traffic comes from one NIC and goes out > > through the other one. The throughput rate is about 600M. The OS is > > Solaris Express SNV-46 on Intel platform. > > > > Through mpstat, I find CPU utilization is unbalanced. One CPU is about > > 90% busy, and the rest three is about 50%. For the one with 90%, mpstat > > shows its "intr" about 24798, while the other three is about 2000. The > > most of time spending on "sys". > > > > I use Dtrace and find the most frequently calls are for networking I/O. > > > > It appears that Solaris sends all NIC interrupts from both NICs to a > > single CPU. I tried to use "ndd -set /dev/ip ip_squeue_fanout 1", but > > seems no much changes. Do I need to reboot to make the fanout effective? > > > If the NIC is gldv3-based, you can enable soft rings. Set > ip_squeue_fanout to 1, unplumb > and plumb the interface back up again. That would configure soft rings. > By default, 2 > soft rings are used. Soft rings would spread the incoming load to 2 CPUs > if 2 rings are > configured. > > -krgopi > _______________________________________________ networking-discuss mailing list [email protected]
