On 2017-11-10 07:02 AM, Christian König wrote: > Am 10.11.2017 um 12:33 schrieb Roger He: >> since sometimes VRAM size is bigger than system memory >> >> Change-Id: I5b14d18ed7a9f79810cc50c023ac9e240bddf101 >> Signed-off-by: Roger He <hongbo...@amd.com> >> --- >> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 11 ++++++++--- >> 1 file changed, 8 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c >> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c >> index cdbdf67..f103ccc 100644 >> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c >> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c >> @@ -1330,9 +1330,14 @@ int amdgpu_ttm_init(struct amdgpu_device *adev) >> DRM_INFO("amdgpu: %uM of VRAM memory ready\n", >> (unsigned) (adev->mc.real_vram_size / (1024 * 1024))); >> - if (amdgpu_gtt_size == -1) >> - gtt_size = max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20), >> - adev->mc.mc_vram_size); >> + if (amdgpu_gtt_size == -1) { >> + struct sysinfo si; >> + >> + si_meminfo(&si); >> + gtt_size = min(max((AMDGPU_DEFAULT_GTT_SIZE_MB << 20), >> + adev->mc.mc_vram_size), >> + ((uint64_t)si.totalram * si.mem_unit)); > > TTM starts to try to swap things out when more than 50% of system > memory are used, 75% is the default hard limit where it starts to > block new allocations. > > So I would go with 75% here as well and code this as:
I believe those limits can be tweaked in /sys/devices/virtual/drm/ttm/memory_accounting. Therefore I'd be against hard-coding strict limits in the driver. Regards, Felix > > gtt_size = AMDGPU_DEFAULT_GTT_SIZE_MB << 20; > gtt_size = max(gtt_size, adev->mc.mc_vram_size); > gtt_size = min(gtt_size, ((uint64_t)si.totalram * si.mem_unit) * 75 / > 100); > > > Regards, > Christian. > >> + > > >> + } >> else >> gtt_size = (uint64_t)amdgpu_gtt_size << 20; >> r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT, gtt_size >> >> PAGE_SHIFT); > > > _______________________________________________ > amd-gfx mailing list > amd-gfx@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/amd-gfx _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx