Thanks to all that replied here and off the list...
Lee
Rob van der Heij wrote:
On Mon, May 4, 2009 at 3:43 PM, Alan Schilla (OET)
<alan.schi...@state.mn.us> wrote:
Interesting. Do you have any numbers on how much overhead? Is it 10% or 80%? I
plan to use LACP too but my intent is more for high availability that high
bandwidth. If I dual path OSA's and Cisco 3750 switch ports into zVM VSWITCH I
would rather use both ports than have one sitting in standby. Personally I am
not impressed that you must dedicate OSAs to a Link Aggregation VSWITCH since
I would just as soon EMIF and share this to 2 zVM LPARS. I am still interested
in the overhead of LACP.
Have a look at http://www.rvdheij.nl/Presentations/zLX44.pdf (pg 29-)
Roughly 50% of an IFL to receive 100 MB/s through VSWITCH LACP. While
folks claim that is because CP must copy the data from one buffer to
the other, copying data can be done in 1% of an IFL for 100 MB/s, so
there is more happening there.
On top of this is the time that Linux itself must spend to manage the
data and do useful things with it. That increases a bit when you let
Linux do the ethernet bondng, but nowhere what you save on CP.
Rob
--
Lee Stewart, Senior SE
Sirius Computer Solutions
Phone: (303) 996-7122
Email: lee.stew...@siriuscom.com
Web: www.siriuscom.com
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