netdev - Re: [PATCH] net: skb_tx

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Date:	Fri, 01 May 2009 09:17:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	andrew@...dna.net, jelaas@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: skb_tx_hash() improvements

From: Eric Dumazet <dada1@...mosbay.com>
Date: Fri, 01 May 2009 11:29:54 +0200

> -	} else if (skb->sk && skb->sk->sk_hash) {
> +		/*
> +		 * Try to avoid an expensive divide, for symmetric setups :
> +		 *   number of tx queues of output device ==
> +		 *   number of rx queues of incoming device
> +		 */
> +		if (hash >= dev->real_num_tx_queues)
> +			hash %= dev->real_num_tx_queues;
> +		return hash;
> +	}

Subtraction in a while() loop is almost certainly a lot
faster.
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