netdev - Re: [PATCH net-next 0/2] net: core: use listified Rx for GRO_NORMAL in napi_gro

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Date:   Fri, 11 Oct 2019 15:23:29 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Alexander Lobakin <alobakin@...nk.ru>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Edward Cree <ecree@...arflare.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Petr Machata <petrm@...lanox.com>,
        Sabrina Dubroca <sd@...asysnail.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] net: core: use listified Rx for GRO_NORMAL
 in napi_gro_receive()

Hi Alexander,

On Thu, Oct 10, 2019 at 05:42:24PM +0300, Alexander Lobakin wrote:
> Hi Dave,
> 
> This series was written as a continuation to commit 323ebb61e32b
> ("net: use listified RX for handling GRO_NORMAL skbs"), and also takes
> an advantage of listified Rx for GRO. This time, however, we're
> targeting at a way more common and used function, napi_gro_receive().
> 
> There are about ~100 call sites of this function, including gro_cells
> and mac80211, so even wireless systems will benefit from it.
> The only driver that cares about the return value is
> ethernet/socionext/netsec, and only for updating statistics. I don't
> believe that this change can break its functionality, but anyway,
> we have plenty of time till next merge window to pay this change
> a proper attention.

I don't think this will break anything on the netsec driver. Dropped packets
will still be properly accounted for

> 
> Besides having this functionality implemented for napi_gro_frags()
> users, the main reason is the solid performance boost that has been
> shown during tests on 1-core MIPS board (with not yet mainlined
> driver):
> 
> * no batching (5.4-rc2): ~450/450 Mbit/s
> * with gro_normal_batch == 8: ~480/480 Mbit/s
> * with gro_normal_batch == 16: ~500/500 Mbit/s
> 
> Applies on top of net-next.
> Thanks.
> 
> Alexander Lobakin (2):
>   net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()
>   net: core: increase the default size of GRO_NORMAL skb lists to flush
> 
>  net/core/dev.c | 51 +++++++++++++++++++++++++-------------------------
>  1 file changed, 26 insertions(+), 25 deletions(-)
> 
> -- 
> 2.23.0
> 

Thanks
/Ilias