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7730b4c7e3
This commit enhances the iwarp driver to optionally keep a log of rdma work request timining data for kernel mode QPs. If iw_cxgb4 module option c4iw_wr_log is set to non-zero, each work request is tracked and timing data maintained in a rolling log that is 4096 entries deep by default. Module option c4iw_wr_log_size_order allows specifing a log2 size to use instead of the default order of 12 (4096 entries). Both module options are read-only and must be passed in at module load time to set them. IE: modprobe iw_cxgb4 c4iw_wr_log=1 c4iw_wr_log_size_order=10 The timing data is viewable via the iw_cxgb4 debugfs file "wr_log". Writing anything to this file will clear all the timing data. Data tracked includes: - The host time when the work request was posted, just before ringing the doorbell. The host time when the completion was polled by the application. This is also the time the log entry is created. The delta of these two times is the amount of time took processing the work request. - The qid of the EQ used to post the work request. - The work request opcode. - The cqe wr_id field. For sq completions requests this is the swsqe index. For recv completions this is the MSN of the ingress SEND. This value can be used to match log entries from this log with firmware flowc event entries. - The sge timestamp value just before ringing the doorbell when posting, the sge timestamp value just after polling the completion, and CQE.timestamp field from the completion itself. With these three timestamps we can track the latency from post to poll, and the amount of time the completion resided in the CQ before being reaped by the application. With debug firmware, the sge timestamp is also logged by firmware in its flowc history so that we can compute the latency from posting the work request until the firmware sees it. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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