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

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Message-ID: <CAJ3xEMiDnv9=nvvJ1m7_taoSncdmgv4GJVR8DiD5t5GCsFig1A@mail.gmail.com>
Date:	Fri, 31 Oct 2014 16:00:07 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Eric Dumazet <eric.dumazet@...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, Oct 31, 2014 at 5:19 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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)

I see. Is this a strong vote to convert the code to use napi_gro_frags
on it's usual track?

Or.
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