On Fri, Feb 27, 2026 at 02:15:12AM -0800, Dipayaan Roy wrote: > On certain systems configured with 4K PAGE_SIZE, utilizing page_pool > fragments for RX buffers results in a significant throughput regression. > Profiling reveals that this regression correlates with high overhead in the > fragment allocation and reference counting paths on these specific > platforms, rendering the multi-buffer-per-page strategy counterproductive. > > To mitigate this, bypass the page_pool fragment path and force a single RX > packet per page allocation when all the following conditions are met: > 1. The system is configured with a 4K PAGE_SIZE. > 2. A processor-specific quirk is detected via SMBIOS Type 4 data. > > This approach restores expected line-rate performance by ensuring > predictable RX refill behavior on affected hardware. > > There is no behavioral change for systems using larger page sizes > (16K/64K), or platforms where this processor-specific quirk do not > apply. > > Signed-off-by: Dipayaan Roy <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
