On Fri, Jun 05, 2026 at 08:35:25AM -0700, Stanislav Fomichev wrote: > On 06/03, Bobby Eshleman wrote: > > From: Bobby Eshleman <[email protected]> > > > > Add -b <bytes> to request a non-default niov size via > > NETDEV_A_DMABUF_RX_BUF_SIZE. When the value exceeds PAGE_SIZE, > > udmabuf_alloc() switches to an MFD_HUGETLB-backed memfd so each 2 MB > > hugepage produces one naturally-aligned sg entry. > > > > Reject values > 2 MB up front: MFD_HUGETLB + udmabuf can only guarantee > > 2 MB per sg entry (one hugepage), so a larger rx_buf_size would fail the > > per-sg length/alignment check. > > > > Add CONFIG_HUGETLBFS=y to drivers/net/hw/config so the new path is > > reachable in the CI kernels built for these tests. > > I vaguely remember there was also some kernel cmdline argument to > reserve these? Do we need to also do something to NIPA to reserve 2MB > pages for this test? Or was it for 1GB pages?
Good call, my little runner script when prototyping this adds these pages at runtime and I forgot to move it into the patch, we can have the py runner do this setup. Best, Bobby
