On Mon, May 06, 2024 at 05:15:55PM +0200, Brian Baboch wrote: > Hello, > > > We discovered that the CONFIG_INFINIBAND_IRDMA configuration option in the > linux kernel is causing excessive memory usage on idle mode on specific > servers like the DELL VEP4600 > (https://www.dell.com/en-us/shop/ipovw/virtual-edge-platform-4600. > > By default we were using Debian's linux-image-6.1.0-13-amd64 which is the > stable 6.1.55-1 amd64, we then compiled the kernel again with the same > config file from the stable 6.1.55 tag and had the same problem. We were > able to resolve the memory problem by removing the `CONFIG_INFINIBAND_IRDMA` > option from the kernel config. > > The tag used to reproduce the problem is v6.1.55. > adding the following config `CONFIG_INFINIBAND_IRDMA=m` causes the excessive > memory usage to go from 1.4Gb to 7Gb. Hi Brian, Why do you think that this is a bug? DELL VEP4600 supports RDMA, so by enabling CONFIG_INFINIBAND_IRDMA, you compiled RDMA support for Intel NIC. https://dl.dell.com/topicspdf/vep4600_tech_guide_en-us.pdf You can unload irdma.ko module and restore memory footprint. Thanks
