netdev - Re: [PATCH] net: gro: selective flush of packets

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Message-ID: <20121007003208.GA31839@gondor.apana.org.au>
Date:	Sun, 7 Oct 2012 08:32:09 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Jesse Gross <jesse@...ira.com>,
	Tom Herbert <therbert@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH] net: gro: selective flush of packets

On Sat, Oct 06, 2012 at 08:08:49PM +0200, Eric Dumazet wrote:
>
> @@ -3981,8 +3996,17 @@ static void net_rx_action(struct softirq_action *h)
>  				local_irq_enable();
>  				napi_complete(n);
>  				local_irq_disable();
> -			} else
> +			} else {
> +				if (n->gro_list) {
> +					/* flush too old packets
> +					 * If HZ < 1000, flush all packets.
> +					 */
> +					local_irq_enable();
> +					napi_gro_flush(n, HZ >= 1000);
> +					local_irq_disable();
> +				}
>  				list_move_tail(&n->poll_list, &sd->poll_list);
> +			}

Why don't we just always flush everything?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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