netdev - Re: [PATCH 12/15] spidernet: increase the NAPI weight

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Date:	Wed, 13 Jun 2007 16:14:36 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Linas Vepstas <linas@...tin.ibm.com>
CC:	Michael Ellerman <michael@...erman.id.au>, netdev@...r.kernel.org,
	cbe-oss-dev@...abs.org
Subject: Re: [PATCH 12/15] spidernet: increase the NAPI weight

Linas Vepstas wrote:
> Another way of minimizing the likelyhood of RX ram from overflowing
> is to empty out the entire rx ring every chance we get. Change
> the crazy watchdog timeout from 50 seconds to 3 seconds, while
> we're here.
> 
> Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
> 
> ----
>  drivers/net/spider_net.h |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6.22-rc1/drivers/net/spider_net.h
> ===================================================================
> --- linux-2.6.22-rc1.orig/drivers/net/spider_net.h	2007-06-11 11:50:03.000000000 -0500
> +++ linux-2.6.22-rc1/drivers/net/spider_net.h	2007-06-11 11:53:26.000000000 -0500
> @@ -56,8 +56,13 @@ extern char spider_net_driver_name[];
>  
>  #define SPIDER_NET_RX_CSUM_DEFAULT		1
>  
> -#define SPIDER_NET_WATCHDOG_TIMEOUT		50*HZ
> -#define SPIDER_NET_NAPI_WEIGHT			64
> +#define SPIDER_NET_WATCHDOG_TIMEOUT		3*HZ
> +
> +/* We really really want to empty the ring buffer every time,
> + * so as to avoid the RX ram full bug. So set te napi wieght
> + * to the ring size.
> + */
> +#define SPIDER_NET_NAPI_WEIGHT	SPIDER_NET_RX_DESCRIPTORS_DEFAULT

I don't see why spider_net should have a different NAPI weight from 
other drivers


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