benchmarks: Add a set-domain benchmark
Benchmark the overhead of changing from GTT to CPU domains and vice
versa. Effectively this measures the cost of a clflush, and how well the
driver can avoid them.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/benchmarks/.gitignore b/benchmarks/.gitignore
index 67afa18..4440de3 100644
--- a/benchmarks/.gitignore
+++ b/benchmarks/.gitignore
@@ -6,6 +6,7 @@
gem_exec_trace
gem_mmap
gem_prw
+gem_set_domain
gem_userptr_benchmark
gem_wait
intel_upload_blit_large
diff --git a/benchmarks/Makefile.sources b/benchmarks/Makefile.sources
index 453f223..fd81195 100644
--- a/benchmarks/Makefile.sources
+++ b/benchmarks/Makefile.sources
@@ -13,6 +13,7 @@
gem_exec_trace \
gem_mmap \
gem_prw \
+ gem_set_domain \
gem_userptr_benchmark \
gem_wait \
kms_vblank \
diff --git a/benchmarks/gem_set_domain.c b/benchmarks/gem_set_domain.c
new file mode 100644
index 0000000..afb410d
--- /dev/null
+++ b/benchmarks/gem_set_domain.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright © 2011-2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Chris Wilson <chris@chris-wilson.co.uk>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include "drm.h"
+#include "ioctl_wrappers.h"
+#include "drmtest.h"
+#include "igt_aux.h"
+
+static double elapsed(const struct timespec *start,
+ const struct timespec *end)
+{
+ return (end->tv_sec - start->tv_sec) + 1e-9*(end->tv_nsec - start->tv_nsec);
+}
+
+int main(int argc, char **argv)
+{
+ int fd = drm_open_driver(DRIVER_INTEL);
+ uint32_t cpu_write = 0;
+ uint32_t gtt_write = 0;
+ int reps = 13;
+ int size = 1024*1024;
+ uint32_t handle;
+ int c, n;
+
+ while ((c = getopt (argc, argv, "c:g:r:s:")) != -1) {
+ switch (c) {
+ case 'c':
+ cpu_write = *optarg == 'w' ? I915_GEM_DOMAIN_CPU : 0;
+ break;
+ case 'g':
+ gtt_write = *optarg == 'w' ? I915_GEM_DOMAIN_GTT : 0;
+ break;
+
+ case 'r':
+ reps = atoi(optarg);
+ if (reps < 1)
+ reps = 1;
+ break;
+
+ case 's':
+ size = atoi(optarg);
+ if (size < 4096)
+ size = 4096;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ fprintf(stderr, "size=%d, cpu=%d, gtt=%d\n", size, cpu_write, gtt_write);
+
+ handle = gem_create(fd, size);
+ gem_set_caching(fd, handle, I915_CACHING_NONE);
+
+ for (n = 0; n < reps; n++) {
+ struct timespec start, end;
+ uint64_t count = 0;
+
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_CPU,
+ cpu_write);
+
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ do {
+ for (c = 0; c < 1000; c++) {
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_GTT,
+ gtt_write);
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_CPU,
+ cpu_write);
+ }
+ count += c;
+ clock_gettime(CLOCK_MONOTONIC, &end);
+ } while (end.tv_sec - start.tv_sec < 2);
+
+ printf("%f\n", count / elapsed(&start, &end));
+ }
+
+ return 0;
+}