AnyNet/400 performance question

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

I'm back (and the first messages I see are about expensive op-codes .... 
aaarrrggh!), anyway I 
am having a "discussion" regarding Anynet performance.

While I know that using Anynet will cause the encapsulated applications to run 
slower than their 
native counterparts (i.e., SNA over IP will run slower than native SNA, and IP 
over SNA will run 
slower than native IP), the discussion is revolving around the last sentence in 
a statement in 
the Communications Configuration manual.

"   Note:  Specifying ALWANYNET(*YES) allows all AnyNet/400 support. In other
          words, this network attribute affects not only APPC over TCP/IP
          support but also sockets over SNA support. Furthermore, sockets
                                                     --------------------
          applications run more slowly when ALWANYNET(*YES) is specified."
          ---------------------------------------------------------------

I do not believe simply turning on AnyNet will noticably slow down native 
sockets applications.

Assume a TCP network running native sockets applications.  Assume I need to use 
an SNA 
application but the network routers will not route SNA so I can't run both TCP 
and SNA over the 
same pipe.  I enable AnyNet and configure the SNA application to use AnyNet 
thus encapsulating 
the SNA data stream and allowing primitive routers to handle it.  The SNA 
application will run 
slower due to AnyNet's insertion in the stack but the existing native TCP 
sockets applications 
should still run at their normal speed.

The only reason I can determine for the sockets applications to perform slower 
is that AnyNet 
doesn't know it is supposed to only handle SNA and so checks the host table (or 
DNS) for a 
sysname.netid.SNA.COM.IBM entry to relate IP addresses to SNA devices which 
shouldn't add a huge 
overhead.

How say you all?

Regards,
Simon Coulter.

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