ADSM-L

Re: TCP window size not supported

1999-08-26 12:08:28
Subject: Re: TCP window size not supported
From: Dustin Cavanaugh <dcavanaugh AT UCSD DOT EDU>
Date: Thu, 26 Aug 1999 09:08:28 -0700
Not an operating system limitation... its a client software bug... a
problem report has been opened with IBM. Here is the text of the report and
IBM's response to date:

When TCPWindowsize is not specified in dsm.sys a warning is issued when
the client connects to the host:
"08/25/99   10:08:17 TcpOpen(): Warning. The TCP window size defined to
ADSM is not supported by your system. It will be to set default size -
1072"

Setting TCPWindowsize to any value (1-1024) results in a similar message
but the default size is reported strangely (eg: size=1024, default size is
reported as 1048952)
 -IBM                   -564802005  -                 99/08/26-07:49-
 -IBM                   -564802005  -                 99/08/26-08:14-
CUSTOMER REP:  No live contact
PROBLEM:       3.1.2.20 ADSM Server on MVS
               3.1.0.7 ADSM Client on Solaris 2.7
               TCPWindowsize setting seems to be causing a new problem.
ACTION TAKEN:  Found APAR IC15269 and others that describe what this
               customer is seeing - yet this problem is unique in that
               the level of Solaris is 2.7 and previously the problem
               only impacted 2.5.  Searched LN and Retain and this may
               be a new defect remanicent of APAR IC15269.
ACTION PLAN:   Queue to ADSM,113 for extended defect support
 -IBM                   -564802005  -                 99/08/26-09:01-


At 05:13 8/26/99 , you wrote:
>Richard Sims wrote:
>
>> >Docs call for 1-2048.
>>
>> Hmmm.  The latest online manual for Unix B/A Clients says
>> "For Solaris the maximum value is 1024.", otherwise the
>> maximum is 2048.  Well, that's one way to move people to
>> RS/6000 boxes.
>
>I beleive that it's purley an operating system limitation. Solaris can't
>do a TCP window size as large as AIX can.  I find it surprising,
>actually, that Sun hasn't been more aggresive in handling  fast
>networks. (Full Duplex 100 MB Ethernet is lame, TCP Receive space is
>small).
>
>
>--
>Ray Schafer                   | schafer AT tkg DOT com
>The Kernel Group              | Distributed Systems Management
>http://www.tkg.com
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