[igt-dev] [PATCH] tests/msm: Add submitoverhead benchmark

[Rob Clark]

On Mon, Aug 7, 2023 at 7:35 AM Kamil Konieczny
<kamil.konieczny at linux.intel.com> wrote:
>
> Hi Rob,
>
> one more nit I just spot:
>
> tests/msm: Add submitoverhead benchmark
> ---------------------^
> this needs to be splitted into two words:
>
> tests/msm: Add submit overhead benchmark
>

The name is "submitoverhead".. like "drawoverhead" in piglit

BR,
-R

> Regards,
> Kamil
>
> On 2023-08-02 at 14:19:54 -0700, Rob Clark wrote:
> > From: Rob Clark <robdclark at chromium.org>
> >
> > Something for profiling CPU overhead of submit ioctl.  Not really a
> > functional test, but it is convenient to re-use the i-g-t infrastructure
> > for this.
> >
> > Signed-off-by: Rob Clark <robdclark at chromium.org>
> > ---
> >  tests/meson.build              |   3 +-
> >  tests/msm/msm_submitoverhead.c | 104 +++++++++++++++++++++++++++++++++
> >  2 files changed, 106 insertions(+), 1 deletion(-)
> >  create mode 100644 tests/msm/msm_submitoverhead.c
> >
> > diff --git a/tests/meson.build b/tests/meson.build
> > index 944a0941f9fd..ca918337ebf6 100644
> > --- a/tests/meson.build
> > +++ b/tests/meson.build
> > @@ -302,7 +302,8 @@ msm_progs = [
> >       'msm_mapping',
> >       'msm_recovery',
> >       'msm_shrink',
> > -     'msm_submit'
> > +     'msm_submit',
> > +        'msm_submitoverhead',
> >  ]
> >
> >  chamelium_progs = [
> > diff --git a/tests/msm/msm_submitoverhead.c b/tests/msm/msm_submitoverhead.c
> > new file mode 100644
> > index 000000000000..d88d6d999ab9
> > --- /dev/null
> > +++ b/tests/msm/msm_submitoverhead.c
> > @@ -0,0 +1,104 @@
> > +/*
> > + * Copyright © 2023 Google, Inc.
> > + *
> > + * 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.
> > + */
> > +
> > +#include "igt.h"
> > +#include "igt_msm.h"
> > +
> > +/*
> > + * Not as much a test, as a kernel submit overhead benchmark.  Generates lots
> > + * of submit ioctls with various size #s of buffers attached for measuring
> > + * and profiling kernel submit CPU overhead.
> > + */
> > +
> > +#define MAX_BOS 1000
> > +
> > +igt_main
> > +{
> > +     struct msm_device *dev = NULL;
> > +     struct msm_pipe *pipe = NULL;
> > +     struct msm_bo *bos[MAX_BOS];
> > +     struct drm_msm_gem_submit_bo bos_table[MAX_BOS];
> > +     static const int sizes[] = {
> > +             10, 100, 250, 500, 1000,
> > +     };
> > +
> > +     igt_fixture {
> > +             struct drm_msm_gem_submit req;
> > +
> > +             dev = igt_msm_dev_open();
> > +             pipe = igt_msm_pipe_open(dev, 0);
> > +             for (int i = 0; i < MAX_BOS; i++) {
> > +                     bos[i] = igt_msm_bo_new(dev, 0x1000, MSM_BO_WC);
> > +                     bos_table[i] = (struct drm_msm_gem_submit_bo) {
> > +                             .handle = bos[i]->handle,
> > +                             /*
> > +                              * We don't bother testing BO_READ since
> > +                              * mesa doesn't use that anymore
> > +                              */
> > +                             .flags  = MSM_SUBMIT_BO_WRITE,
> > +                     };
> > +             }
> > +
> > +             /*
> > +              * Prime the pump, so first submit doesn't take the overhead
> > +              * of allocating backing pages:
> > +              */
> > +             req = (struct drm_msm_gem_submit) {
> > +                     .flags   = pipe->pipe | MSM_SUBMIT_FENCE_FD_OUT,
> > +                     .queueid = pipe->submitqueue_id,
> > +                     .nr_bos  = ARRAY_SIZE(bos_table),
> > +                     .bos     = VOID2U64(bos_table),
> > +             };
> > +             do_ioctl(dev->fd, DRM_IOCTL_MSM_GEM_SUBMIT, &req);
> > +             igt_wait_and_close(req.fence_fd);
> > +     }
> > +
> > +     for (int i = 0; i < ARRAY_SIZE(sizes); i++) {
> > +             for (int mode = 0; mode < 2; mode++) {
> > +                     const char *modestr = mode ? "-no-implicit-sync" : "";
> > +                     const uint32_t modeflags = mode ? MSM_SUBMIT_NO_IMPLICIT : 0;
> > +                     igt_subtest_f("submitbench-%u-bos%s", sizes[i], modestr) {
> > +                             struct drm_msm_gem_submit req = {
> > +                                     .flags   = pipe->pipe | modeflags,
> > +                                     .queueid = pipe->submitqueue_id,
> > +                                     .nr_bos  = sizes[i],
> > +                                     .bos     = VOID2U64(bos_table),
> > +                             };
> > +                             unsigned iterations = 0;
> > +                             igt_for_milliseconds(2000) {
> > +                                     do_ioctl(dev->fd, DRM_IOCTL_MSM_GEM_SUBMIT, &req);
> > +                                     iterations++;
> > +                             }
> > +                             igt_info("%u-bos: %u iterations\n", sizes[i], iterations);
> > +                     }
> > +             }
> > +     }
> > +
> > +     igt_fixture {
> > +             for (int i = 0; i < MAX_BOS; i++) {
> > +                     igt_msm_bo_free(bos[i]);
> > +             }
> > +             igt_msm_pipe_close(pipe);
> > +             igt_msm_dev_close(dev);
> > +     }
> > +}
> > --
> > 2.41.0
> >