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Subject: Re: [OMPI users] RETRY EXCEEDED ERROR
From: Jan Lindheim (lindheim_at_[hidden])
Date: 2009-03-05 16:26:05


On Thu, Mar 05, 2009 at 10:27:27AM +0200, Pavel Shamis (Pasha) wrote:
>
> >Time to dig up diagnostics tools and look at port statistics.
> >
> You may use ibdiagnet tool for the network debug -
> *http://linux.die.net/man/1/ibdiagnet. *This tool is part of OFED.
>
> Pasha.
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>

Thanks Pasha!
ibdiagnet reports the following:

-I---------------------------------------------------
-I- IPoIB Subnets Check
-I---------------------------------------------------
-I- Subnet: IPv4 PKey:0x7fff QKey:0x00000b1b MTU:2048Byte rate:10Gbps SL:0x00
-W- Port localhost/P1 lid=0x00e2 guid=0x001e0bffff4ced75 dev=25218 can not join
    due to rate:2.5Gbps < group:10Gbps

I guess this may indicate a bad adapter. Now, I just need to find what
system this maps to.

I also ran ibcheckerrors and it reports a lot of problems with buffer
overruns. Here's the tail end of the output, with only some of the last
ports reported:

#warn: counter SymbolErrors = 36905 (threshold 10) lid 193 port 14
#warn: counter LinkDowned = 23 (threshold 10) lid 193 port 14
#warn: counter RcvErrors = 15641 (threshold 10) lid 193 port 14
#warn: counter RcvSwRelayErrors = 225 (threshold 100) lid 193 port 14
#warn: counter ExcBufOverrunErrors = 10 (threshold 10) lid 193 port 14
Error check on lid 193 (ISR9288/ISR9096 Voltaire sLB-24) port 14: FAILED
#warn: counter LinkRecovers = 181 (threshold 10) lid 193 port 1
#warn: counter RcvSwRelayErrors = 2417 (threshold 100) lid 193 port 1
Error check on lid 193 (ISR9288/ISR9096 Voltaire sLB-24) port 1: FAILED
#warn: counter LinkRecovers = 103 (threshold 10) lid 193 port 3
#warn: counter RcvErrors = 9035 (threshold 10) lid 193 port 3
#warn: counter RcvSwRelayErrors = 64670 (threshold 100) lid 193 port 3
Error check on lid 193 (ISR9288/ISR9096 Voltaire sLB-24) port 3: FAILED
#warn: counter SymbolErrors = 13151 (threshold 10) lid 193 port 4
#warn: counter RcvErrors = 109 (threshold 10) lid 193 port 4
#warn: counter RcvSwRelayErrors = 507 (threshold 100) lid 193 port 4
Error check on lid 193 (ISR9288/ISR9096 Voltaire sLB-24) port 4: FAILED

## Summary: 209 nodes checked, 0 bad nodes found
## 716 ports checked, 103 ports have errors beyond threshold

I wonder if this is something that needs to be tuned in the Infiniband
switch or if there is something in OpenMPI/OpenIB that can be tuned.

Thanks,
Jan Lindheim