Michael S. Tsirkin wrote: > Quoting r. Or Gerlitz <[EMAIL PROTECTED]>:
>> Eitan Zahavi wrote: >>> The following patch solves an issue with OpenSM preferring largest MTU >>> for PathRecord/MultiPathRecord for paths going to or from MT23108 (Tavor) >>> devices instead of using a 1K MTU which is best for this device. >> Isn't the 2K MTU issue with Tavor comes into play only under RC QP? > I don't think so, no. Tavor supports 2K MTU, but it has better performance > with > 1K MTU than 2K MTU. QP type should not matter. Can you double check that please, as far as i know there is something like BW 40-50% drop with Tavor/RC/2048 vs Tavor/RC/1024 but the BW with Tavor/UD/2048 is **no less** then Tavor/UD/1024. So its very common for IPoIB net devices impl. to expose 2044 or 1500 bytes MTU to the OS eg to cope with Ethernet and reduce IP fragmentation/reassembly of UDP/TCP traffic. Or. _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
