This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- zesty' to 'verification-done-zesty'. If the problem still exists, change the tag 'verification-needed-zesty' to 'verification-failed-zesty'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-zesty -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1711096 Title: dma-buf: performance issue when looking up the fence status Status in linux package in Ubuntu: Triaged Status in linux source package in Zesty: Fix Committed Bug description: 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) 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711096/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
