***SPAM*** Re: [ofa-general] Re: [PATCH] opensm: preserve base lid routes

[Olga Shern (Voltaire)]

On 6/12/08, Olga Shern (Voltaire) <olga.shern at gmail.com> wrote:
>
>
>
> On 6/12/08, Hal Rosenstock <hrosenstock at xsigo.com> wrote:
>>
>> On Tue, 2008-06-10 at 05:59 +0300, Sasha Khapyorsky wrote:
>> > Basically this addresses the problem described by Al Chu in:
>> >
>> > http://lists.openfabrics.org/pipermail/general/2008-April/049132.html
>> >
>> > When base lid paths become completely disbalanced on a fabrics with
>> > lmc > 0.
>> >
>> > One feedback was from Yiftah Shahar:
>> >
>> > "I think that our requirements should be that even when you are working
>> > with LMC>0 then the base LID routing should not be affected.
>>
>> > One way to achieve this goal is to first run the base-LID routing (so
>> > all base LID improvement will be also in LMC>0) and then start with the
>> > other LIDs as round-robbing starting from the base-lid-port + 1
>> > according current routing algorithm rules (keeping min-hop,
>> up/down...)."
>> >
>> > We had some discussion with Al and Yiftah about this and considered that
>> > in addition to "pure" base lid paths preservation (which is good thing
>> by
>> > itself) proposed method solves original lid disbalancing problem as
>> well.
>>
>> Would you elaborate on the motivation behind the requirement to
>> maintain/preserve the base LID routing ?
>>
>> -- Hal
>
>
> LMC > 0 is mainly used by MPI, all other protocols / applications will use
> only one LID (PATH),  therefore we should make sure that performance of
> these protocols / applications will not be effected if fabric is configured
> with LMC > 0
>


I meant "affected" and not "effected" of course

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