Btw. I just checked the jammy kernel config options and jammy/22.04 had and still has strict=yes: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 22.04.4 LTS Release: 22.04 Codename: jammy $ uname -a Linux maasrrc1 5.15.0-112-generic #122-Ubuntu SMP Thu May 23 08:10:47 UTC 2024 s390x s390x s390x GNU/Linux ubuntu@maasrrc1:~$ grep CONFIG_IOMMU_DEFAULT_DMA_STRICT /boot/config-5.15.0-112-generic CONFIG_IOMMU_DEFAULT_DMA_STRICT=y $ grep CONFIG_IOMMU_DEFAULT_DMA_STRICT /boot/config-5.15.0-112-generic I also checked older jammy kernels and strict was always yes.
So this has obviously never changed from jammy to noble! Have you modified/tweaked the setting manually on your side before testing on jammy?! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2071471 Title: [UBUNTU 24.04] IOMMU DMA mode changed in kernel config causes massive throughput degradation for PCI-related network workloads To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/2071471/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
