netdev - Re: net/mlx4_en: Pad ethernet packets smaller than 17 bytes

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Date:	Thu, 27 Feb 2014 06:44:15 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Amir Vadai <amirv@...lanox.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>
Subject: Re: net/mlx4_en: Pad ethernet packets smaller than 17 bytes

On Thu, 2014-02-27 at 16:02 +0200, Amir Vadai wrote:
>  
> Yes, skb will not be classified as inline-able if nr_frags != 1.
> See is_inline()

How often this inline stuff ever happens ?

It looks like the length of the frame needs to be shorter than 44 bytes,
right ?

Minimal length for TCP is 54 bytes.

I wonder why you tried to inline stuff that is probably never
seen in real workload.



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