** Also affects: linux-nvidia-6.14 (Ubuntu)
Importance: Undecided
Status: New
--
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
Status in linux-nvidia-6.14 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
