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ioat, kperf: fix the testing output.

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The previous performance caculation is wrong,
which is smaller than the per channel performance,
so fix it with the average performance data.

Change-Id: I40580e5f70fb4273fa080bbdfb17ce85436446aa
Signed-off-by: Ziye Yang <ziye.yang@intel.com>
This commit is contained in:
Ziye Yang 2017-01-17 10:59:34 +08:00 committed by Ben Walker
parent 23dd35a729
commit bd2697e6b0
1 changed files with 14 additions and 7 deletions
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21
examples/ioat/kperf/ioat_kperf.c
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@ -39,6 +39,8 @@
#include <inttypes.h> #include <inttypes.h>
#include <assert.h> #include <assert.h>
#define ioat_max(a,b) (((a)>(b))?(a):(b))
static int static int
check_modules(char *driver_name) check_modules(char *driver_name)
{ {
@ -331,26 +333,31 @@ int main(int argc, char *argv[])
sprintf(channel, "/sys/kernel/debug/dmaperf/dmaperf/thread_%u/copied", i); sprintf(channel, "/sys/kernel/debug/dmaperf/dmaperf/thread_%u/copied", i);
rc = get_u64_from_file(channel, &copied); rc = get_u64_from_file(channel, &copied);
if (rc < 0) { if (rc < 0) {
fprintf(stderr, "Cannot get channel copied bytes\n"); fprintf(stderr, "Cannot get channel copied data\n");
return -1; return -1;
} }
/* time in microseconds for total data transfer length */ /* time in microseconds for total data transfer length */
sprintf(channel, "/sys/kernel/debug/dmaperf/dmaperf/thread_%u/elapsed_time", i); sprintf(channel, "/sys/kernel/debug/dmaperf/dmaperf/thread_%u/elapsed_time", i);
/* elapsed_time is in microsecond */
rc = get_u64_from_file(channel, &elapsed_time); rc = get_u64_from_file(channel, &elapsed_time);
if (rc < 0) { if (rc < 0) {
fprintf(stderr, "Cannot get channel elapsed time\n"); fprintf(stderr, "Cannot get channel elapsed time\n");
return -1; return -1;
} }
assert(elapsed_time != 0); assert(elapsed_time != 0);
perf = copied / elapsed_time; perf = (copied * 1000 * 1000) / (elapsed_time * 1024 * 1024);
total_copied += copied; total_copied += copied;
total_time += elapsed_time; total_time = ioat_max(elapsed_time, total_time);
fprintf(stdout, "Channel %d Performance Data %"PRIu64" MB/s\n", fprintf(stdout, "Channel %d Bandwidth %"PRIu64" MiB/s\n",
i, perf); i, perf);
} }
if (total_time && threads) if (total_time && threads) {
fprintf(stdout, "Total Channel Performance Data %"PRIu64" MB/s\n", fprintf(stdout, "Total Channel Bandwidth: %"PRIu64" MiB/s\n",
total_copied / total_time / threads); total_copied / total_time);
fprintf(stdout, "Average Bandwidth Per Channel: %"PRIu64" MiB/s\n",
(total_copied * 1000 * 1000) / (total_time * threads * 1024 * 1024));
}
return 0; return 0;
} }