RE: Setting SDU and tcp.nodelay
- From: "Roger Xu" <Roger.Xu@xxxxxxxxxxx>
- To: <cemail_219@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 27 Sep 2006 14:34:29 -0500
http://www.dba-oracle.com/art_builder_tns.htm
SDU specifies the size of the packets to send over the network.
Ideally, SDU should not surpass the size of the maximum transmission unit
(MTU).
MTU is a fixed value that depends on the actual network implementation used.
Oracle recommends that SDU be set equal to MTU.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of J. Dex
Sent: Wednesday, September 27, 2006 2:07 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Setting SDU and tcp.nodelay
I want to try setting SDU for a 9207 database to see if it helps performance
issues that we are having since moving a database to another location over a
longer WAN (we have already eliminated other possible solutions). I have
read a couple of documents on Metalink but I am still not sure how to know
what to set SDU too? One doc said to set the SDU size as a multiple of the
MSS but I am not sure how to tell what the Maximum Segment Size is. Another
doc indicated that if the default is 2K, to double that and set it to 4096
bytes. Has anyone else had to do this? Any suggestions?
Also, are there any negative ramifications of having both tcp.nodelay and
SDU set?
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