mlx4_core 0000:07:00.0: swiotlb buffer is full and OOM observed during stress test on reset_controller

[Yi Zhang]

On 06/04/2017 11:49 PM, Sagi Grimberg wrote:
> Hi Yi,
>
>> Finally found below patch [1] that fixed this issue.
>> With [1], I can see the speed of reset_controller operation[2] is 
>> obviously slow than before.
>>
>>
>> [1]
>> commit b7363e67b23e04c23c2a99437feefac7292a88bc
>> Author: Sagi Grimberg <sagi at grimberg.me>
>> Date:   Wed Mar 8 22:03:17 2017 +0200
>>
>>      IB/device: Convert ib-comp-wq to be CPU-bound
>
> This is very unlikely.
>
> I think that what made this go away is:
>
> commit 777dc82395de6e04b3a5fedcf153eb99bf5f1241
> Author: Sagi Grimberg <sagi at grimberg.me>
> Date:   Tue Mar 21 16:29:49 2017 +0200
>
>     nvmet-rdma: occasionally flush ongoing controller teardown
>
>     If we are attacked with establishments/teradowns we need to
>     make sure we do not consume too much system memory. Thus
>     let ongoing controller teardowns complete before accepting
>     new controller establishments.
>
Hi Sagi
This patch fixed the issue, thanks again.

Yi
>
> Cheers,
> Sagi.
>
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