RE: [lwip-users] Jumbo frame questions

[Goldschmidt Simon]

Bill

 

Which version of lwIP are you using? I think there has been a change in CVS recently that fits your problem (remote mss not used for sending). Could you try to use the v1.3.0 release candidate?

 

Simon

 

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Von: address@hidden [mailto:address@hidden Im Auftrag von Bill Auerbach
Gesendet: Donnerstag, 31. Januar 2008 16:54
An: 'Mailing list for lwIP users'
Betreff: [lwip-users] Jumbo frame questions

Hello,

 

I made changes to support Jumbo Frames (9k).  Besides the driver changes, I used TCP_MSS of 9000.  All is good with about 100Mb/S speed increase.

 

I dropped back to a connection that doesn’t support jumbo frames and I have connection problems because of TCP_MSS not being e.g. 1512.

 

I cannot use something like: #define TCP_MSS (UseJumbo ? 9000 : 1512).

 

How can I adjust TCP_MSS when I’m on a “normal” network?  Or… what else do I need to look at for supporting Jumbo frames transparently?  Shouldn’t my lwIP side see the other end’s MSS on connection and downsize accordingly?

 

If this is a basic networking or TCP question and off topic, please let me know where to find what I need.

 

Thank you,

 

Bill Auerbach