Public bug reported: A partner report below error which seems a fixed issue from upstream and it affect NVME performance, hope to backport it.
Oct 27 06:05:17 quanta kernel: [ 1238.707245] AMD-Vi: Failed to allocate IRTE The related patch and discussion is below: https://lkml.org/lkml/2020/10/14/1153 Certain device drivers allocate IO queues on a per-cpu basis. On AMD EPYC platform, which can support up-to 256 cpu threads, this can exceed the current MAX_IRQ_PER_TABLE limit of 256, and result in the error message: AMD-Vi: Failed to allocate IRTE This has been observed with certain NVME devices. AMD IOMMU hardware can actually support upto 512 interrupt remapping table entries. Therefore, update the driver to match the hardware limit. Please note that this also increases the size of interrupt remapping table to 8KB per device when using the 128-bit IRTE format. ** Affects: linux-hwe-5.15 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.15 in Ubuntu. https://bugs.launchpad.net/bugs/2054860 Title: AMD-Vi Failed to allocate IRTE Status in linux-hwe-5.15 package in Ubuntu: New Bug description: A partner report below error which seems a fixed issue from upstream and it affect NVME performance, hope to backport it. Oct 27 06:05:17 quanta kernel: [ 1238.707245] AMD-Vi: Failed to allocate IRTE The related patch and discussion is below: https://lkml.org/lkml/2020/10/14/1153 Certain device drivers allocate IO queues on a per-cpu basis. On AMD EPYC platform, which can support up-to 256 cpu threads, this can exceed the current MAX_IRQ_PER_TABLE limit of 256, and result in the error message: AMD-Vi: Failed to allocate IRTE This has been observed with certain NVME devices. AMD IOMMU hardware can actually support upto 512 interrupt remapping table entries. Therefore, update the driver to match the hardware limit. Please note that this also increases the size of interrupt remapping table to 8KB per device when using the 128-bit IRTE format. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.15/+bug/2054860/+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
