netdev - Re: [PATCH 1/3, net-next] net: netsec: Use page

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Date:   Fri, 28 Jun 2019 15:04:34 +0200
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     netdev@...r.kernel.org, jaswinder.singh@...aro.org,
        ard.biesheuvel@...aro.org, bjorn.topel@...el.com,
        magnus.karlsson@...el.com, daniel@...earbox.net, ast@...nel.org,
        makita.toshiaki@....ntt.co.jp, jakub.kicinski@...ronome.com,
        john.fastabend@...il.com, davem@...emloft.net,
        maciejromanfijalkowski@...il.com, brouer@...hat.com
Subject: Re: [PATCH 1/3, net-next] net: netsec: Use page_pool API

On Fri, 28 Jun 2019 13:39:13 +0300
Ilias Apalodimas <ilias.apalodimas@...aro.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.apalodimas@...aro.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 <brouer@...hat.com>

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer