Steffen,
The traffic is multiple streams.
The card I am using is Broadcom NetXtreme II Gigabit Ethernet Driver
v2.8.5, and the system is Intel woodcrest multicores, but Solaris
recognize it as i386.
Status of virtual processor 0 as of: 10/17/2006 19:25:28
on-line since 10/17/2006 02:30:43.
The i386 processor operates at 2992 MHz,
and has an i387 compatible floating point processor.
Andrew
On Tue, 2006-10-17 at 07:25 -0400, Steffen Weiberle wrote:
> Hi Andrew,
>
> Is the traffic a single stream or are there multiple ones? I am under
> the impression that with multiple streams incoming processing will get
> distributed (except for interrupts). Also, I thought stack would
> switch from interrupts to polling under heavy load (if data has
> already arrived).
>
> I'm trying to understand the limitations, if any, based on instruction
> set, NIC type, etc.
>
> Thanks
> Steffen
>
> Andrew Wenlang Zhu wrote On 10/16/06 23:03,:
> > 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?
> >
> > HP-UX can bind one NIC to a particular CPU, so that the CPU will take
> > care of all I/Os for the NIC to get a good data locality, while the
> > burden of serving interrupts can be shared among several CPUs.
> >
> > Does Solaris has a similar thing? Or how to make network load balanced
> > cross several CPUs to alleviate the CPU bottleneck and achieve a higher
> > overall throughput?
> >
> > Thanks,
> >
> > Andrew
> >
> >
> > _______________________________________________
> > networking-discuss mailing list
> > [email protected]
_______________________________________________
networking-discuss mailing list
[email protected]
