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

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Message-ID: <20191011123253.GA8693@apalos.home>
Date:   Fri, 11 Oct 2019 15:32:53 +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 Fri, Oct 11, 2019 at 03:27:50PM +0300, Alexander Lobakin wrote:
> Hi Ilias,
> 
> Ilias Apalodimas wrote 11.10.2019 15:23:
> > 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
> > 
> 
> Thank you for clarification. Do I need to mention you under separate
> Acked-by in v2?
> 

Well i only checked for the netsec part. I'll try having a look on the whole
patch and send a proper Acked-by if i get some free time!

> > > 
> > > 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
> 
> Regards,
> ᚷ ᛖ ᚢ ᚦ ᚠ ᚱ

Regards
/Ilias