https://bugs.openfabrics.org/show_bug.cgi?id=450
------- Comment #7 from [EMAIL PROTECTED] 2007-03-25 02:44 ------- Subject: Re: [ofa-general] New: IPoIB BW drop (measured with iperf) with mtu=1500 on x86 RH4UP3 On 3/14/07, Michael S. Tsirkin <[EMAIL PROTECTED]> wrote: > > Quoting Moni Levy <[EMAIL PROTECTED]>: > > Subject: Re: [ofa-general] [Bug 450] New: IPoIB BW drop (measured with > > iperf) with mtu=1500 on x86 RH4UP3 > > > > On 3/13/07, Michael S. Tsirkin <[EMAIL PROTECTED]> wrote: > > >> >Why are you playing with ifc mtu? > > >> > > >> We needed to do some IP forwarding tests between IB and Ethernet and > > >> wanted to have the same MTU for the eth0 and ib0 interfaces, after > > >> that we reproduced that in a peer to peer configuration. > > > > > >OK but PMTU discovery would do this better, won't it? > > > > I'm not sure (it will probably drop some packets at the beginning). > > Can you check pls? > > > Anyway lower MTU should work. > > Manually tweaking MTU seems to be broken in lots of systems - > I sometimes see the same behaviour with gigabit ethernet. > > > >As a side note, with 1.5K MTU it's probably better to use datagram mode > > >anyway. > > > > Now I see that I missed that in the report. We used datagram mode. > > Did you try checking ethernet BW on the same machine? Ethernet seem to work fine. I can't reproduce the bug in the last week. The only thing that I see now is that at that same MTU and connected mode enabled I get the same low BW. What version of tcpdump are You using ? -- Moni > > -- > MST > -- Configure bugmail: https://bugs.openfabrics.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug, or are watching the assignee. _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
