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ntb_perf: extend with doorbell latency measurement
Doorbell latency is a delay between start to ring an NTB doorbell and receiving the confirmation. The remote system needs to be run in server mode beforehand. Then the server waits for a doorbell event and immediately rings self doorbell to confirm. Thanks-to: Guo Zhengkui <guozhengkui@vivo.com> Signed-off-by: Alexander Fomichev <a.fomichev@yadro.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
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