** Description changed: SRU Request: [Impact] When a timeout of zero is specified, the caller is only interested in the fence status. In the current implementation, dma_fence_default_wait will always call schedule_timeout() at least once for an unsignaled fence. This adds a significant overhead to a fence status query. Avoid this overhead by returning early if a zero timeout is specified. [Test Case] 1) Install the new kernel - 2) + 2) Download amdgpu-pro-17.30-465504.tar.xz from http://support.amd.com + /en-us/kb-articles/Pages/AMDGPU-PRO-Driver-for-Linux-Release-Notes.aspx, + and follow the install guide to install the driver on Ubuntu 16.04.3 + + 3) Install Unigine Heaven to get performance score + + 4) Rmeove DKMS, remove this patch + http://git.amd.com:8080/gitweb?p=brahma/ec/linux.git;a=commit;h=8586edda6677b90f3971919f3c6babbbec4b5b8c + from DKMS source code, and install DKMS + + 5) re-run the benchmark, and check if there's any obvious performance + drop. [Regression Potential] Low, the patch is very small, and it is already available upstream. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=03c0c5f6641533f5fc14bf4e76d2304197402552
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1711096 Title: dma-buf: performance issue when looking up the fence status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
