On Wed, May 06, 2026 at 09:58:56AM -0700, Dipayaan Roy wrote: > On some ARM64 platforms with 4K PAGE_SIZE, utilizing page_pool > fragments for allocation in the RX refill path (~2kB buffer per fragment) > causes 15-20% throughput regression under high connection counts > (>16 TCP streams at 180+ Gbps). Using full-page buffers on these > platforms shows no regression and restores line-rate performance. > > This behavior is observed on a single platform; other platforms > perform better with page_pool fragments, indicating this is not a > page_pool issue but platform-specific. > > This series adds an ethtool private flag "full-page-rx" to let the > user opt in to one RX buffer per page: > > ethtool --set-priv-flags eth0 full-page-rx on > > There is no behavioral change by default. The flag can be persisted > via udev rule for affected platforms. > > Changes in v7: > - Rebased onto net-next. > - Retained private flag approach after David Wei's testing on > Grace (ARM64) confirmed that fragment mode outperforms > full-page mode on other platforms, validating this is a > single-platform workaround rather than a generic issue. > Changes in v6: > - Added missed maintainers. > Changes in v5: > - Split prep refactor into separate patch (patch 1/2) > Changes in v4: > - Dropping the smbios string parsing and add ethtool priv flag > to reconfigure the queues with full page rx buffers. > Changes in v3: > - changed u8* to char* > Changes in v2: > - separate reading string index and the string, remove inline. > > Dipayaan Roy (2): > net: mana: refactor mana_get_strings() and mana_get_sset_count() to > use switch > net: mana: force full-page RX buffers via ethtool private flag > > drivers/net/ethernet/microsoft/mana/mana_en.c | 22 ++- > .../ethernet/microsoft/mana/mana_ethtool.c | 164 ++++++++++++++---- > include/net/mana/mana.h | 8 + > 3 files changed, 163 insertions(+), 31 deletions(-) > > -- > 2.43.0 >
Sashiko pointed out a valid point,I will reshare a v8 adressing that. https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260506170034.327907-1-dipayanroy%40linux.microsoft.com Thank you
