netdev - Re: [PATCH net-next 5/8] net/mlx4_en: Remove redundant code from RX/GRO path

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Message-ID: <1414725541.499.3.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 30 Oct 2014 20:19:01 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Or Gerlitz <ogerlitz@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Matan Barak <matanb@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Shani Michaeli <shanim@...lanox.com>,
	Ido Shamay <idos@...lanox.com>
Subject: Re: [PATCH net-next 5/8] net/mlx4_en: Remove redundant code from
 RX/GRO path

On Fri, 2014-10-31 at 01:25 +0200, Or Gerlitz wrote:
> On Thu, Oct 30, 2014 at 9:00 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > On Thu, 2014-10-30 at 18:06 +0200, Or Gerlitz wrote:
> >> Remove the code which goes through napi_gro_frags() on the RX path,
> >> use only napi_gro_receive().
> 
> > Hmpff... napi_gro_frags() should be faster.
> > Have you benchmarked this ?
> 
> 
> yep we did, napi_gro_frags() was somehow better for single stream. Do
> you think we need to do it the other way around, e.g converge to use
> napi_gro_frags()?

napi_gro_frags() is faster because the napi->skb is reused fast (not
going through kfree_skb()/alloc_skb() for every fragment)


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