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- cosmic' to 'verification-done-cosmic'. If the problem still exists, change the tag 'verification-needed-cosmic' to 'verification-failed- cosmic'.
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-cosmic -- 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/1829942 Title: Address performance issue w/ GICv4-based guests Status in linux package in Ubuntu: In Progress Status in linux source package in Cosmic: Fix Committed Status in linux source package in Disco: Fix Committed Status in linux source package in Eoan: In Progress Bug description: [Impact] Performance is degraded when a guest is booted w/ vgic v4 support enabled. [Test Case] I used a HiSilicon D06 system w/ an Intel 82599 10Gbps NIC. I passed through a VF to a guest, and ran "netperf -H <host>" against a 10Gbps-capable target. With vgic v4 support, I'm only seeing 5-6Gbps. With vgic v3 support, this was in the 9Gbps spectrum. And, after applying the upstream fix, I'm also seeing >9Gbps w/ vgic v4 enabled. Note: to enable vgic v4 support, pass "kvm-arm.vgic_v4_enable=1" on the host kernel cmdline. [Fix] ca71228b42a96 arm64: KVM: Always set ICH_HCR_EL2.EN if GICv4 is enabled [Regression Risk] The fix is restricted to the ARM/KVM subsystem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829942/+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
