971f07b9fb
John Kariuki tested this patch on a system with several Intel P5800X Optane SSDs, to determine the performance impact of adding these two spdk_trace_records() in the main NVMe I/O path. The pathological case (512B random reads on a single Xeon core) decreased from 13.10M to 12.88M, or 1.7%. Normal workloads (4KB+) would incur a smaller penalty since the I/O rate would be much lower - maybe even unnoticeable.. This is a really valuable tracepoint to have enabled by default, so I think this small amount of degradation is acceptable. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: Ie2543cadf3541eb74398d31ac0f495522ab49ec0 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/9303 Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com> Community-CI: Mellanox Build Bot Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Changpeng Liu <changpeng.liu@intel.com> Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com> |
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