Re: [ewg] MLX4 Strangeness

[Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

Tziporet Koren wrote:
> On 2/15/2010 10:24 PM, Tom Tucker wrote:
>   
>> Hello,
>>
>> I am seeing some very strange behavior on my MLX4 adapters running 2.7
>> firmware and the latest OFED 1.5.1. Two systems are involved and each
>> have dual ported MTHCA DDR adapter and MLX4 adapters.
>>
>> The scenario starts with NFSRDMA stress testing between the two systems
>> running bonnie++ and iozone concurrently. The test completes and there
>> is no issue. Then 6 minutes pass and the server "times out" the
>> connection and shuts down the RC connection to the client.
>>
>>   From this point on, using the RDMA CM, a new RC QP can be brought up
>> and moved to RTS, however, the first RDMA_SEND to the NFS SERVER system
>> fails with IB_WC_RETRY_EXC_ERR. I have confirmed:
>>
>> - that "arp" completed successfully and the neighbor entries are
>> populated on both the client and server
>> - that the QP are in the RTS state on both the client and server
>> - that there are RECV WR posted to the RQ on the server and they did not
>> error out
>> - that no RECV WR completed successfully or in error on the server
>> - that there are SEND WR posted to the QP on the client
>> - the client side SEND_WR fails with error 12 as mentioned above
>>
>> I have also confirmed the following with a different application (i.e.
>> rping):
>>
>> server# rping -s
>> client# rping -c -a 192.168.80.129
>>
>> fails with the exact same error, i.e.
>> client# rping -c -a 192.168.80.129
>> cq completion failed status 12
>> wait for RDMA_WRITE_ADV state 10
>> client DISCONNECT EVENT...
>>
>> However, if I run rping the other way, it works fine, that is,
>>
>> client# rping -s
>> server# rping -c -a 192.168.80.135
>>
>> It runs without error until I stop it.
>>
>> Does anyone have any ideas on how I might debug this?
>>
>>
>>    
>>     
> Tom
> What is the vendor syndrome error when you get a completion with error?
>
>   
Hang on... compiling....
> Does the issue occurs only on the ConnectX cards (mlx4) or also on the 
> InfiniHost cards (mthca)
>
>   

Only the MLX4 cards.

> Tziporet
>
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>   

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