Commit 32120b63 authored by Jim Harris's avatar Jim Harris
Browse files

examples/nvme/perf: fix latency calculations 



Signed-off-by: default avatarJim Harris <james.r.harris@intel.com>
Change-Id: I0c47f2086d4f895cd75f32efc7df30d7182adcb1

Reviewed-on: https://review.gerrithub.io/362269


Tested-by: default avatarSPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
Reviewed-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
parent 58ed3685

examples/nvme/perf/perf.c

+4 −3
Original line number Diff line number Diff line
@@ -111,9 +111,10 @@ struct ns_entry { 
 * store the bucket data.

 */

#define BUCKET_SHIFT 7

#define BUCKET_LSB (64 - BUCKET_SHIFT)

#define NUM_BUCKETS_PER_RANGE (1ULL << BUCKET_SHIFT)

#define BUCKET_MASK (NUM_BUCKETS_PER_RANGE - 1)

#define NUM_BUCKET_RANGES (64 - BUCKET_SHIFT + 1)

#define NUM_BUCKET_RANGES (BUCKET_LSB + 1)



struct ns_worker_ctx {

	struct ns_entry		*entry;
@@ -206,8 +207,8 @@ get_bucket_range(uint64_t tsc) 


	clz = __builtin_clzll(tsc);



	if (clz <= NUM_BUCKET_RANGES) {

		range = NUM_BUCKET_RANGES - clz;

	if (clz <= BUCKET_LSB) {

		range = BUCKET_LSB - clz;

	} else {

		range = 0;

	}