Hey Robert,
I narrowed the performance degradation to this series
7861728..5e47f19, but while trying to bisect it, the changes were
erratic between each commit that I could not figure out exactly which
introduced the issue. If someone could give me some pointers on what
to do, I can keep trying to dig through this.
This bisection brings suspects:
e3416ab2d156 iser-target: Kill the ->isert_cmd back pointer in struct
iser_tx_desc
d1ca2ed7dcf8 iser-target: Kill struct isert_rdma_wr
9679cc51eb13 iser-target: Convert to new CQ API
5adabdd122e4 iser-target: Split and properly type the login buffer
ed1083b251f0 iser-target: Remove ISER_RECV_DATA_SEG_LEN
26c7b673db57 iser-target: Remove impossible condition from isert_wait_conn
69c48846f1c7 iser-target: Remove redundant wait in release_conn
6d1fba0c2cc7 iser-target: Rework connection termination
f81bf458208e iser-target: Separate flows for np listeners and
connections cma events
aea92980601f iser-target: Add new state ISER_CONN_BOUND to isert_conn
b89a7c25462b iser-target: Fix identification of login rx descriptor type
However I don't really see performance implications in these patches,
not to mention something that would affect on ConnectIB...
Given that your bisection brings up target side patches, I have
a couple questions:
1. Are the CPU usage in the target side at 100%, or the initiator side
is the bottleneck?
2. Would it be possible to use another target implementation? TGT maybe?
3. Can you try testing right before 9679cc51eb13? This is a patch that
involves data-plane.
4. Can you try the latest upstream kernel? The iser target code uses
a generic data-transfer library and I'm interested in knowing what is
the status there.
Cheers,
Sagi.
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