I agree with Sasha. Administrator needs to configure the SM to assign the lowest allowed rate. All the rest is beyond the spec. Might be a good idea but not very practical until spec'd.
Eitan Zahavi > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:general- > [EMAIL PROTECTED] On Behalf Of Sasha Khapyorsky > Sent: Friday, April 13, 2007 6:41 PM > To: Hal Rosenstock > Cc: [EMAIL PROTECTED] > Subject: Re: [ofa-general] Default multicast group rate > > On 07:44 Fri 13 Apr , Hal Rosenstock wrote: > > Hi, > > > > There has been a lot of discussion over the last week on failed > > multicast joins. > > > > The current default rate for multicast groups is 10 Gbps. This means > > that slower nodes (whether due to 1x SDR equipment or a degraded link) > > will fail the join. > > > > The current default was chosen in the belief that most installations > > would be 4x SDR equipment or better (the most common use case) rather > > than the lowest common denominator use case. Also, choosing a lower > > default affects preformance of all multicast groups (which includes the > > IPv4 broadcast group as well as any other derived groups (not just IPoIB > > multicast groups)). So when certain performance tests are run, this will > > be a factor which needs to be investigated. The thinking was that those > > subtle things are harder (but perhaps less frequent) to find than the > > "harder" join error which forces the admin to decide one way or the > > other so there is no masking this. > > > > So the question is whether the best default is 2.5 Gbps which would > > allow any nodes to join or whether the current default is appropriate ? > > I know certain people's opinions who have been vocal on this list up to > > now. I'm looking for other opinions. Thanks. > > This value is configurable, and 10Gs/s as default looks reasonable > for me. > > Sasha > _______________________________________________ > 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 _______________________________________________ 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
