network performance tuning of httpd.

[Andy Wang <awang@xxxxxxx>]

I'm using apache httpd 2.4.16 and attempting to do some network 
benchmarking on windows, and noted extremely poor performance with 
static files and large transfers through ajp to tomcat.

I decided on a lark to tune SendBufferSize to 131072 and bingo.

massive transfer speed difference.

Without SendBufferSize set, I'm pushing <20MB/s or so.  This is on a 
local gigabit LAN.

Once I set SendBufferSize to 131072  my transfers increased to about 30MB/s.

Tuning the AJP packet size resulted in an even larger increase (going 
64k got me to 60MB/s - which is pretty close to what I would expect 
given other forms of network file transfers.

Tomcat and apache are both local, so I really don't get why the packet 
size made such a big difference but what I especially don't understand 
is why the SendBufferSize actually matters.  I was under the impression 
that with older versions of windows, pre XP-SP2, the SendBufferSize 
defaulted to 8k (which actually explains the <20MB/s performance) but 
modern windows I thought they'd fixed that?  Is this not the case?  Is 
the default sendbuffer still only 8192bytes?

Thanks,
Andy

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