Created attachment 98402 [details] dmesg *System Environment: -------------------------- Platform: IVB HSW ULT kernel: -nightly: 08ce6614d07dd1e426109672a5e323317c8d6ec7(fails) -queued: e5c03ca362819ba8ffbe5674340b61b9cd75de8f (fails) -fixes: 9bbfd20abe5025adbb0ac75160bd2e41158a9e83 (fails) *Bug detailed description: ----------------------------- igt/gem_render_tiled_blits costs long time to execute, it costs about 12 minutes to finish. This case always timeout. Output: date;./gem_render_tiled_blits;date Sun May 4 13:07:16 CST 2014 IGT-Version: 1.6-gc864279 (x86_64) (Linux: 3.15.0-rc2_drm-intel-nightly_08ce66_20140504+ x86_64) Using 3072 1MiB buffers Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... Sun May 4 13:18:33 CST 2014 *Reproduce steps: ---------------------------- 1. ./gem_render_tiled_blits
Tip: use "time ./cmd" rather than "date; ./cmd; date"
commit 66d5f092d46120d97a0408dcd8fea0c0e086d7a8 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Thu May 8 11:56:56 2014 +0100 igt/gem_render_tiled_blits: Speed up by using the GPU to detile Avoid accessing via the slow GTT to read back and compare the contents of each bo against expected results. It is much faster, on llc at least, to detile using the GPU and then copy to system memory for the compare. Before: IVB: time sudo ./gem_render_tiled_blits IGT-Version: 1.6-ge46ff3f (x86_64) (Linux: 3.15.0-rc3+ x86_64) Using 3072 1MiB buffers Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... real 6m26.005s user 6m19.234s sys 0m2.414s PNV: time sudo ./gem_render_tiled_blits IGT-Version: 1.6-g8556f8a (i686) (Linux: 3.15.0-rc2+ i686) Using 768 1MiB buffers Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... real 1m45.431s user 1m34.960s sys 0m4.624s Using pread: IVB: time sudo ./gem_render_tiled_blits IGT-Version: 1.6-ge46ff3f (x86_64) (Linux: 3.15.0-rc3+ x86_64) Using 3072 1MiB buffers Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... real 0m14.717s user 0m3.699s sys 0m3.192s Using snoop: IVB: time sudo ./gem_render_tiled_blits IGT-Version: 1.6-ge46ff3f (x86_64) (Linux: 3.15.0-rc3+ x86_64) Using 3072 1MiB buffers Using a snoop linear buffer for comparisons Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... real 0m13.774s user 0m3.900s sys 0m2.089s PNV: time sudo ./gem_render_tiled_blits IGT-Version: 1.6-g8556f8a (i686) (Linux: 3.15.0-rc2+ i686) Using 768 1MiB buffers Using a snoop linear buffer for comparisons Verifying initialisation... Cyclic blits, forward... Cyclic blits, backward... Random blits... real 0m20.831s user 0m4.384s sys 0m5.032s So roughly 10-30x faster depending on platform. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78244 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Fixed on latest -nightly（2be456541ea41728002ccca2de5235f48d14326e), Thanks.
Closing old verified.
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