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@xxxxxxxxxxx>
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@xxxxxxxxxxx>
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.
Cheers,
Sagi.
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