On Tue 19 Jun 2007 at 09:37PM, Luke Schwab wrote:
> Hi,
> 
> I have recently been running performance tests with zones on several
> Sun servers. (280's and 880's), 2 CPU and 8CPUs respectively.
> 
> On my 280 servers (2CPU machines), I installed and booted 3 zones and
> I get poor performance on across the network (400Mbps). I only
> transfer data at 80% of what I can in the global zone with no zones
> installed or booted (where I measured 550Mbps). That is a 20%
> difference in performance. I tested with the opensource tool called
> IPERF.
> 
> I originally thought that zones were causing my problems so I decided
> to move to another type of hardware, a V880 (8 CPU) machine. When I
> ran my performance tests again with 3 zones installed and booted I saw
> <1% overhead in the network compared to running in the global zone
> with no zones installed or booted. Both of the 880 tests ran around
> 860 Mbps throughput with less then 1% difference between several
> scripted tests.
> 
> Can anyone explain why I see this? Both servers have gigabit NICs
> installed. The only thing I can think of is that the backplane on the
> servers in a bottleneck for the small 280 servers. But how could this
> (or something else in the kernel space) be causing the symptoms I see
> above?

I don't know offhand-- but could you please repost this CC'ing both
lists?  Otherwise we'll fail to have one conversation.  Alternatively,
responders, please follow up to this mail, which CC's both lists.

        -dp

-- 
Daniel Price - Solaris Kernel Engineering - [EMAIL PROTECTED] - blogs.sun.com/dp
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