Sorry for the delays. The nvme fio test didn't stress the system enough with this build, so I setup two systems with a direct wired, back to back, high performance network link and ran iperf. With the client in pass through, and the server in passthough/nonpassthrough, the data rate was slightly less than half in the nonpassthrough case.
This is verified ** Tags removed: verification-needed-zesty ** Tags added: verification-done-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/1688158 Title: [SRU][Zesty] Support SMMU passthrough using the default domain Status in linux package in Ubuntu: Fix Committed Status in linux source package in Zesty: Fix Committed Bug description: [Impact] Have the SMMU come up in a passthrough configuration, and then allow subsequent translation for things such as VFIO. Rather than do this in each SMMU driver, it's much cleaner to allow the default domain to be configured to be something other than DMA. This patch series implements a command-line option to configure the default domain type. Currently, it supports "dma" and "identity" which is sufficient for the passthrough use-case. [Fix] The following patch series in linux-next adds this support to the kernel. 4a8d8a14c0d0 arm64: dma-mapping: Only swizzle DMA ops for IOMMU_DOMAIN_DMA fccb4e3b8ab0 iommu: Allow default domain type to be set on the kernel command line beb3c6a066bf iommu/arm-smmu-v3: Install bypass STEs for IOMMU_DOMAIN_IDENTITY domains 67560edcd8e5 iommu/arm-smmu-v3: Make arm_smmu_install_ste_for_dev return void 61bc671179f1 iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY domains 0834cc28fa56 iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1688158/+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
