From: Hackett, Peter (PHackett@talisman-energy.com)
Date: Fri Nov 04 2005 - 14:05:39 EST
Good Day,
I have a Solaris 9 V880 NFS server w/4 X 900MHz CPU's and 8GB of Memory.
It's configured with 5 HBA's for various disk and SAN connectivy, and a
CE interface (@1000FD) for network connectivity. The problem I'm
experiencing is that I cant seem to get more than 30 MB (240Mbps)
through the network interface where I am expecting around 85MB
(680Mbpb). I'm using TTCP and simply FTP to measure. I am trying to
find where the problem lies and where the bottleneck is. What I've
looked at so far is SE-Toolkit's nx.se which indicates 0 Coll%, 0
NoCP/s, and 0 Defr/s, and I've looked at nicstat (from brendangregg.com)
which also show very low utilization and zero saturation. I also did a
switch from ge to ce to no avail. So, this leaves me with the though
that maybe there's not enough CPU resources to drive all this I/O, but
CPU's typically don't run greater than ~70%, with %sys not much greater
than 25% or so, which is where I though I would see problems if CPU was
the factor. Anyway, I'm looking for how I determine where and why my
network throughput is about a third of what it should be? What metrics /
tools can I use to isolate and pinpoint the bottleneck? Any and all
help and insight would be appreciated.
Peter
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