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Use os_tick_ns() monotonic timer and add compiler memory barriers
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This commit is contained in:
Andrea Mazzoleni 2026-10-02 10:45:30 +02:00
parent dcb3c7db37
commit 0ad0913ef2
2 changed files with 24 additions and 29 deletions
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35
cmdline/speed.c
View file

@ -11,18 +11,11 @@
#include "raid/memory.h"
#include "state.h"
/**
* Differential us of two timeval.
*/
static int64_t diffgettimeofday(struct timeval* start, struct timeval* stop)
{
int64_t d;
d = 1000000LL * (stop->tv_sec - start->tv_sec);
d += stop->tv_usec - start->tv_usec;
return d;
}
#if HAVE_ASSEMBLY
#define SPEED_BARRIER() __asm__ __volatile__ ("" : : : "memory")
#else
#define SPEED_BARRIER() do { } while (0)
#endif
#define SPEED_START \
{ \
@ -30,15 +23,17 @@ static int64_t diffgettimeofday(struct timeval* start, struct timeval* stop)
int64_t elapsed_ = 0; \
int64_t best_dt_ = INT64_MAX; \
do { \
struct timeval start; \
struct timeval stop; \
gettimeofday(&start, 0); \
SPEED_BARRIER(); \
uint64_t start_ = os_tick_ns(); \
SPEED_BARRIER(); \
for (int i_ = 0; i_ < speed_delta_; ++i_)
#define SPEED_STOP \
gettimeofday(&stop, 0); \
dt = diffgettimeofday(&start, &stop); \
if (dt < 1000 && speed_delta_ <= INT_MAX / 2) { \
SPEED_BARRIER(); \
uint64_t stop_ = os_tick_ns(); \
SPEED_BARRIER(); \
dt = stop_ > start_ ? stop_ - start_ : 0; \
if (dt < 1000000 && speed_delta_ <= INT_MAX / 2) { \
speed_delta_ *= 2; \
elapsed_ = 0; \
best_dt_ = INT64_MAX; \
@ -47,8 +42,8 @@ static int64_t diffgettimeofday(struct timeval* start, struct timeval* stop)
elapsed_ += dt; \
if (dt < best_dt_) \
best_dt_ = dt; \
} while (elapsed_ < period * 1000LL); \
ds = size * (int64_t)speed_delta_ * nd; \
} while (elapsed_ < period * 1000000LL); \
ds = size * (int64_t)speed_delta_ * nd * 1000LL; \
dt = best_dt_; \
}

18
raid/test/speedtest.c
View file

@ -36,19 +36,19 @@ static int64_t diffgettimeofday(struct timeval *start, struct timeval *stop)
d = 1000000LL * (stop->tv_sec - start->tv_sec);
d += stop->tv_usec - start->tv_usec;
return d;
return d > 0 ? d : 0;
}
#define SPEED_START \
{ \
int speed_delta_ = delta; \
int64_t elapsed_ = 0; \
int64_t best_dt_ = INT64_MAX; \
do { \
struct timeval start; \
struct timeval stop; \
gettimeofday(&start, 0); \
for (int i_ = 0; i_ < speed_delta_; ++i_)
int speed_delta_ = delta; \
int64_t elapsed_ = 0; \
int64_t best_dt_ = INT64_MAX; \
do { \
struct timeval start; \
struct timeval stop; \
gettimeofday(&start, 0); \
for (int i_ = 0; i_ < speed_delta_; ++i_)
#define SPEED_STOP \
gettimeofday(&stop, 0); \