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examples/nvme/perf: fix latency calculations

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

Reviewed-on: https://review.gerrithub.io/362269
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Jim Harris 2017-05-23 14:40:53 -07:00
parent 58ed368569
commit 32120b6336
1 changed files with 4 additions and 3 deletions
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7
examples/nvme/perf/perf.c
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@ -111,9 +111,10 @@ struct ns_entry {
* store the bucket data. * store the bucket data.
*/ */
#define BUCKET_SHIFT 7 #define BUCKET_SHIFT 7
#define BUCKET_LSB (64 - BUCKET_SHIFT)
#define NUM_BUCKETS_PER_RANGE (1ULL << BUCKET_SHIFT) #define NUM_BUCKETS_PER_RANGE (1ULL << BUCKET_SHIFT)
#define BUCKET_MASK (NUM_BUCKETS_PER_RANGE - 1) #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_worker_ctx {
struct ns_entry *entry; struct ns_entry *entry;
@ -206,8 +207,8 @@ get_bucket_range(uint64_t tsc)
clz = __builtin_clzll(tsc); clz = __builtin_clzll(tsc);
if (clz <= NUM_BUCKET_RANGES) { if (clz <= BUCKET_LSB) {
range = NUM_BUCKET_RANGES - clz; range = BUCKET_LSB - clz;
} else { } else {
range = 0; range = 0;
} }