On Wed, Jun 16, 2021 at 04:24:05PM -0400, Brandon Lo wrote: > Hi everyone, > > I have been trying to expand the UNH IOL unit testing coverage over to > FreeBSD 13. > Following this documentation: > https://doc.dpdk.org/guides/freebsd_gsg/build_dpdk.html#loading-the-dpdk-contigmem-module > > I compiled the contigmem kernel module from the latest DPDK v21.05 and > set the variables in /boot/loader.conf. > This results in a kernel trap 12 on boot with a machine that has 4GB > of RAM available and 1 GB assigned for contigmem. > > If I only set the loader.conf to load the contigmem kernel module > without setting any variables, then it boots fine. > However, using these default settings, DPDK unit tests (fast-suite) > fail in some of the test cases. > > Is this a memory-related issue where the virtual machine does not have > enough memory allocated (if so, how much RAM is needed?), > or is it related to compatibility issues between the different FreeBSD > versions? > Given that the defaults if you don't specify a loader.conf value is to use is 512MB, I suspect that it is indeed the case, and that the kernel is struggling to find a single block of 1GB for use.
In terms of how much memory is needed, I'm not sure, it may take a bit of trial and error to determine. What tests are needing more than 512MB of RAM? I would have thought that that should have been plenty for most cases. Another option to try rather than allocating a single 1GB block is to attempt to create e.g. 2x 512MB or 3x 256MB blocks and see if that works, or helps with the unit tests. Regards, /Bruce
