Our official recommendation is for 63. IBM's position on a value >63 is "
Since Windows 2000 supports TCP window scaling, it may be beneficial to use
a larger TCP window size for Windows 2000 systems that are communicating
exclusively with other Windows 2000 or UNIX systems".

Cordiali saluti
Gianluca Mariani
Tivoli TSM Global Response Team, Roma
Via Sciangai 53, Roma
 phones : +39(0)659664598
                   +393351270554 (mobile)
gianluca_mariani AT it.ibm DOT com



                      Dirk Kastens
                      <Dirk.Kastens@UNI-OSN        To:       ADSM-L AT 
VM.MARIST DOT EDU
                      ABRUECK.DE>                  cc:
                      Sent by: "ADSM: Dist         Subject:  Re: optimising 
tcpwindowsize and tcpbuffsizes
                      Stor Manager"
                      <ADSM-L AT VM.MARIST DOT EDU
                      >


                      10/07/2002 12:41
                      Please respond to
                      "ADSM: Dist Stor
                      Manager"





Hi,

> TCPWINDOWSIZE should be set to 63 on Win2k.

No, that's the recommendation for WinNT4. The maximum
value for Win2k is 64 (see the MS knowledge base article
Q224829).
After we set the values for TCPWINDOWSIZE to 64 and the
TCPBUFFSIZE to 512 the throughput of our Win2k clients
has been increased dramatically from 200 kB/s to 4-5 MB/s.

Regards,
Dirk