From: Dustin Cavanaugh <dcavanaugh AT UCSD DOT EDU>
Reply-To: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: TCP window size not supported
Date: Thu, 26 Aug 1999 09:10:00 -0700

No size is recommended. Please see my other response this day.

At 08:38 8/26/99 , you wrote:
>Question....what is the recommended TCP window size?
>
>=======================================
>
>-----Original Message-----
>From: Ray Schafer [mailto:schafer AT TKG DOT COM]
>Sent: Thursday, August 26, 1999 7:14 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: Re: TCP window size not supported
>
>
>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

Its really a system limitation. Try to allocate such a big communications
buffer from the OS, and you will get an error message. But only on Solaris
not on the other client platforms.
Thats why we limited the solaris client.


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