Re: "memory management error" with NFS/RDMA on RoCE

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Hi Sagi-

On Jun 27, 2017, at 5:28 AM, Sagi Grimberg <sagi@xxxxxxxxxxx> wrote:


While running xfstests on an NFS/RDMA mount, I see this in
the client's /var/log/messages multiple times:
Jun 22 14:13:45 manet kernel: mlx5_0:dump_cqe:275:(pid 0): dump error cqe
Jun 22 14:13:45 manet kernel: 00000000 00000000 00000000 00000000
Jun 22 14:13:45 manet kernel: 00000000 00000000 00000000 00000000
Jun 22 14:13:45 manet kernel: 00000000 00000000 00000000 00000000
Jun 22 14:13:45 manet kernel: 00000000 08007806 250000cd 024027d3
Jun 22 14:13:45 manet kernel: rpcrdma: fastreg: memory management operation error (6/0x78)
As far as I can tell the client is able to recover and continue
the test. However, this error is not supposed to happen in normal
operation.
This is with a Mellanox CX4 in RoCEv1 mode, v4.12-rc2.

Is this a regression?

I can't answer that question with authority, because I just
started trying out NFS/RDMA on RoCE with mlx5. But Robert has
reported very similar symptoms with iSER on v4.9. It appears
to have been around for a while, if these are the same.

Is Robert running 4.9 on the initiator side?
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