** Description changed: CONFIG_IOMMU_DEFAULT_DMA_LAZY is disabled for ARM as not all ARM IOMMU support passthrough and LAZY mode. Nvidia CPU SMMU supports passthrough and lazy IOMMU mode so set lazy mode as default for better performance. We need this 24.04 HWE and LTS versions. perf numbers: 2 Grace sockets, 4 SSDs per socket. All 4 SSDs in a socket connected to the same PCIe root port. SSD model: SAMSUNG MZTL63T8HFLT-00AW7 4KiB random read performance per disk: 1.7-2M IOPs (the spec says 1.7, but we are able to hit 2M) - IOMMU config IOPs (M) - passthrough 16.5 - lazy invalidations 16.4 - strict invalidations 2.8 + IOMMU config | IOPs (M) + passthrough | 16.5 + lazy invalidations | 16.4 + strict invalidations | 2.8
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-nvidia-6.11 in Ubuntu. https://bugs.launchpad.net/bugs/2119661 Title: Set CONFIG_IOMMU_DEFAULT_DMA_LAZY as default for Nvidia CPUs Status in linux-nvidia-6.11 package in Ubuntu: New Bug description: CONFIG_IOMMU_DEFAULT_DMA_LAZY is disabled for ARM as not all ARM IOMMU support passthrough and LAZY mode. Nvidia CPU SMMU supports passthrough and lazy IOMMU mode so set lazy mode as default for better performance. We need this 24.04 HWE and LTS versions. perf numbers: 2 Grace sockets, 4 SSDs per socket. All 4 SSDs in a socket connected to the same PCIe root port. SSD model: SAMSUNG MZTL63T8HFLT-00AW7 4KiB random read performance per disk: 1.7-2M IOPs (the spec says 1.7, but we are able to hit 2M) IOMMU config | IOPs (M) passthrough | 16.5 lazy invalidations | 16.4 strict invalidations | 2.8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-nvidia-6.11/+bug/2119661/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
