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- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
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-bionic -- 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/1774472 Title: hisi_sas: improve performance by optimizing DQ locking Status in linux package in Ubuntu: In Progress Status in linux source package in Bionic: Fix Committed Bug description: [Impact] The way the driver deals with locking the DQ causes performance to suffer. [Test Case] Run iozone3 and validate performance is >= previous. [Fix] Once a DQ slot is allocated, it must be used. So, currently the driver locks the DQ while it builds and sends each task to the hardware, just in case there is a failure, so that it can reuse that slot. However - there is a point at which we the build/send is guaranteed to succeed, so we can release the lock at that point allowing new slots to be allocated. [Regression Risk] All fixes are localized to the hisi_sas drivers, which are drivers for the controllers in the hip06/hip07 SoCs, where we have directly tested these updates. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774472/+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
