Re: [ewg] MLX4 Strangeness

Tom Tucker
2010-02-17T00:18:37Z

> 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?
>>
>>
> Feb 16 15:08:29 vic10 kernel: rpcrdma: connection to
> 192.168.80.129:20049 closed (-103)
> Feb 16 15:51:27 vic10 kernel: rpcrdma: connection to
> 192.168.80.129:20049 on mlx4_0, memreg 5 slots 32 ird 16
> Feb 16 15:52:01 vic10 kernel: rpcrdma_event_process:160 wr_id
> ffff81002879a000 status 5 opcode 0 vendor_err 244 byte_len 0 qp
> ffff81003c9e3200 ex 00000000 src_qp 00000000 wc_flags, 0 pkey_index
> Feb 16 15:52:06 vic10 kernel: rpcrdma: connection to
> 192.168.80.129:20049 closed (-103)
> Feb 16 15:52:06 vic10 kernel: rpcrdma: connection to
> 192.168.80.129:20049 on mlx4_0, memreg 5 slots 32 ird 16
> Feb 16 15:52:40 vic10 kernel: rpcrdma_event_process:160 wr_id
> ffff81002879a000 status 5 opcode 0 vendor_err 244 byte_len 0 qp
> ffff81002f2d8400 ex 00000000 src_qp 00000000 wc_flags, 0 pkey_index
>
> Repeat forever....
>
> So the vendor err is 244.
>

Please ignore this. This log skips the failing WR (:-\). I need to do
another trace.

>> Does the issue occurs only on the ConnectX cards (mlx4) or also on
>> the InfiniHost cards (mthca)
>>
>> Tziporet
>>
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