Looks like it's not sufficient to have IOMMU_DEFAULT_DMA_LAZY=y only in addition IOMMU_DEFAULT_DMA_STRICT=n seems to be needed on top (otherwise the build failed for me). (Which I think is not super great upstream, one option should be fine -- with the two kernel options, there are now two unspecific cases: both n and both y - anyway ...)
I did a test build in PPA here: https://launchpad.net/~fheimes/+archive/ubuntu/lp2071471 would be great if this can be tried. -- 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
