netdev - Re: [net-next-2.6 PATCH v5 1/2] net: implement mechanism for HW based QOS

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Date:	Thu, 06 Jan 2011 19:56:31 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"jarkao2@...il.com" <jarkao2@...il.com>,
	"hadi@...erus.ca" <hadi@...erus.ca>,
	"shemminger@...tta.com" <shemminger@...tta.com>,
	"tgraf@...radead.org" <tgraf@...radead.org>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [net-next-2.6 PATCH v5 1/2] net: implement mechanism for HW
 based QOS

Le jeudi 06 janvier 2011 à 10:45 -0800, John Fastabend a écrit :

> It should still be 64 bytes.
> 
> struct netdev_tc_txq {
>         u16 count;
>         u16 offset;
> };
> 
> struct netdev_tc_txq (4 octets) and TC_MAX_QUEUE = 16, so 4*16 = 64
> 
> +	struct netdev_tc_txq tc_to_txq[TC_MAX_QUEUE];   => 64 octets
> +	u8 prio_tc_map[TC_BITMASK+1];			=> 16 octets
> 
> All together 80 bytes this is certainly in the 512 unused bytes.

Good ;)

Considering a single TCP socket is larger than a net_device, I think its
OK to not worry too much ;)



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