On Fri, 28 Jun 2019 13:39:13 +0300 Ilias Apalodimas <ilias.apalodi...@linaro.org> wrote:
> Use page_pool and it's DMA mapping capabilities for Rx buffers instead > of netdev/napi_alloc_frag() > > Although this will result in a slight performance penalty on small sized > packets (~10%) the use of the API will allow to easily add XDP support. > The penalty won't be visible in network testing i.e ipef/netperf etc, it > only happens during raw packet drops. > Furthermore we intend to add recycling capabilities on the API > in the future. Once the recycling is added the performance penalty will > go away. > The only 'real' penalty is the slightly increased memory usage, since we > now allocate a page per packet instead of the amount of bytes we need + > skb metadata (difference is roughly 2kb per packet). > With a minimum of 4BG of RAM on the only SoC that has this NIC the > extra memory usage is negligible (a bit more on 64K pages) > > Signed-off-by: Ilias Apalodimas <ilias.apalodi...@linaro.org> > --- > drivers/net/ethernet/socionext/Kconfig | 1 + > drivers/net/ethernet/socionext/netsec.c | 121 +++++++++++++++--------- > 2 files changed, 75 insertions(+), 47 deletions(-) Acked-by: Jesper Dangaard Brouer <bro...@redhat.com> -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
