netdev - Re: [PATCH 3/3] net: mvneta: Introduce a software TSO implementation

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Date:	Thu, 10 Apr 2014 16:16:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Simon Guinot <simon.guinot@...uanux.org>,
	Willy Tarreau <w@....eu>, Tawfik Bayouk <tawfik@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Simon Guinot <sguinot@...ie.com>
Subject: Re: [PATCH 3/3] net: mvneta: Introduce a software TSO implementation

On Thu, 2014-04-10 at 19:58 -0300, Ezequiel Garcia wrote:
> +	/* Calculate expected number of TX descriptors */
> +	desc_count = skb_shinfo(skb)->gso_segs * 2 + skb_shinfo(skb)->nr_frags;
> +	if ((txq->count + desc_count) >= txq->size)
> +		return 0;
> +

Hmm.. have you tried to play with small MSS ?

I think you should set dev->gso_max_segs to a sensible value...

see commit 7e6d06f0de3f7 for details.




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