[ofa-general] [PATCH] IPoIB UD 4K MTU support

Shirley Ma mashirle at us.ibm.com
Thu Jan 31 01:04:01 PST 2008


Hello Roland,

> I don't think CM is quite the same issue as for 4K-4 MTU, as one could
> easily imagine an implementation that allows an MTU of 128KB or 1MB or
> whatever.  Also the CM protocol negotiates the receive size available,
> so we shouldn't have the problems of getting a local length error.

There is no issue on getting local length error, but there is an issue
when the other side set to 64k - 4 mtu, linux side set to 64k - 12 mtu,
the none TCP based application will be broken without amdin's notice.
TCP should be OK since it does MSS negotiation.

Thanks
Shirley




More information about the general mailing list