netdev - Re: [PATCH v2 net-next] bridge: Add ability to enable TSO

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Date:	Fri, 9 Jan 2015 00:44:46 -0500 (EST)
From:	Pankaj Gupta <pagupta@...hat.com>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:	"David S . Miller" <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH v2 net-next] bridge: Add ability to enable TSO


> 
> Currently a bridge device turns off TSO feature if no bridge ports
> support it. We can always enable it, since packets can be segmented on
> ports by software as well as on the bridge device.
> This will reduce the number of packets processed in the bridge.
> 
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> ---
> v2: Use an existing helper function.
> 
>  net/bridge/br_if.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
> index ed307db..81e49fb 100644
> --- a/net/bridge/br_if.c
> +++ b/net/bridge/br_if.c
> @@ -424,6 +424,7 @@ netdev_features_t br_features_recompute(struct net_bridge
> *br,
>  		features = netdev_increment_features(features,
>  						     p->dev->features, mask);
>  	}
> +	features = netdev_add_tso_features(features, mask);

Just a doubt. Are we inducing latency if source has traffic at very low rate.
I mean by default do we need it?

>  
>  	return features;
>  }
> --
> 1.8.1.2
> 
> 
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