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ahci & exynos5: do test repetitions in ahci_bench

This commit is contained in:
Martin Stein 2013-06-27 11:32:09 +02:00 committed by Stefan Kalkowski
parent e3c3f9f44f
commit 118ca20a2f
1 changed files with 36 additions and 29 deletions
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65
os/src/drivers/ahci/exynos5/bench/main.cc
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@ -51,15 +51,19 @@ static void run_benchmark(Block::Driver &driver,
}
size_t const block_count = request_size / driver.block_size();
/*
* The goal is to get a test that took 2 s < time < 2.3 s,
* thus we start with count = 32 and then adjust the count
* The goal is to get 5 test repetitions that took 2 s < time < 2.3 s,
* each. Thus we start with count = 32 and then adjust the count
* for a retry if the test time is not in range.
*/
unsigned bytes = 64 * request_size;
unsigned ms = 0;
unsigned tmp_bytes = 64 * request_size;;
unsigned bytes = 0;
unsigned ms = 0;
unsigned reps = 0;
float sec = 0;
float mb_per_sec = 0;
while (1)
{
size_t num_requests = bytes / request_size;
size_t num_requests = tmp_bytes / request_size;
/* do measurement */
unsigned const time_before_ms = timer.elapsed_ms();
@ -73,31 +77,35 @@ static void run_benchmark(Block::Driver &driver,
unsigned const time_after_ms = timer.elapsed_ms();
ms = time_after_ms - time_before_ms;
/*
* leave or adjust transfer amount according to measured time
*
* FIXME implement static inertia
*/
/* check if test time in range */
if (ms < 2000 || ms >= 2300) {
bytes = (((float) 2150 / ms) * bytes);
bytes &= 0xfffffe00; /* align to 512 byte blocks */
printf("retry with %u B\n", bytes);
} else break;
/*
* adjust transfer amount according to measured time
*
* FIXME implement static inertia
*/
tmp_bytes = (((float) 2150 / ms) * tmp_bytes);
tmp_bytes &= 0xfffffe00; /* align to 512 byte blocks */
} else {
/* if new result is better than the last one do update */
float const tmp_mb = ((float)tmp_bytes / 1000) / 1000;
float const tmp_sec = (float)ms / 1000;
float const tmp_mb_per_sec = (float)tmp_mb / tmp_sec;
if (tmp_mb_per_sec > mb_per_sec) {
sec = tmp_sec;
mb_per_sec = tmp_mb_per_sec;
bytes = tmp_bytes;
}
/* check if we need more repetitions */
reps++;
if (reps == 5) break;
}
}
/* convert and print results */
float const mb = ((float)bytes / 1000) / 1000;
unsigned const mb_left = mb;
unsigned const mb_right = 1000 * ((float)mb - mb_left);
float const sec = (float)ms / 1000;
unsigned const sec_left = sec;
unsigned const sec_right = 1000 * ((float)sec - sec_left);
float const mb_per_sec = (float)mb / sec;
unsigned const sec_left = sec;
unsigned const sec_right = 1000 * ((float)sec - sec_left);
unsigned const mb_per_sec_left = mb_per_sec;
unsigned const mb_per_sec_right = 1000 * ((float)mb_per_sec
- mb_per_sec_left);
PLOG(" %10u %10u %10u.%03u %u.%03u %10u.%03u", request_size, bytes,
mb_left, mb_right, sec_left, sec_right, mb_per_sec_left,
mb_per_sec_right);
unsigned const mb_per_sec_right = 1000 * ((float)mb_per_sec - mb_per_sec_left);
PLOG(" %10u %10u %u.%03u %10u.%03u", request_size, bytes, sec_left, sec_right, mb_per_sec_left, mb_per_sec_right);
}
@ -120,8 +128,7 @@ int main(int argc, char **argv)
size_t const buffer_size = 1024*1024;
/* allocate read/write buffer */
static Attached_ram_dataspace buffer(env()->ram_session(), buffer_size,
false);
static Attached_ram_dataspace buffer(env()->ram_session(), buffer_size, false);
char * const buffer_virt = buffer.local_addr<char>();
addr_t const buffer_phys = Dataspace_client(buffer.cap()).phys_addr();