netdev - Re: [WIP][PATCHES] Network xmit batching

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Date:	Mon, 02 Jul 2007 14:20:44 -0700
From:	"Matt Carlson" <mcarlson@...adcom.com>
To:	hadi@...erus.ca
cc:	"Robert Olsson" <Robert.Olsson@...a.slu.se>,
	"Evgeniy Polyakov" <johnpol@....mipt.ru>,
	"Krishna Kumar2" <krkumar2@...ibm.com>,
	"Gagan Arneja" <gaagaan@...il.com>, netdev@...r.kernel.org,
	"Rick Jones" <rick.jones2@...com>,
	"Sridhar Samudrala" <sri@...ibm.com>,
	"David Miller" <davem@...emloft.net>,
	"Jeff Garzik" <jeff@...zik.org>,
	"Michael Chan" <mchan@...adcom.com>
Subject: Re: [WIP][PATCHES] Network xmit batching - tg3 support

On Wed, 2007-06-27 at 20:05 -0400, jamal wrote:
> peoplez,
> 
> I have added support for tg3 on batching. I see equivalent performance
> improvement for pktgen as i did with e1000 when using gige. 
> I have only tested on two machines (one being a laptop which does
> 10/100Mbps). Unfortunately in both cases these are considered to be in
> the class of  "buggy" tg3s (which take a longer code path).
> 
> To the tg3 folks - can you double check if am off on something?
> I have split a few things that you may like as well.
> I havent upgraded the tree - it is still circa 2.6.22-rc4 based; at some
> point i will sync with Daves net-26
> 
> Anyone who has tg3 based hardware: I would appreciate any testing and
> results ...
> 
> The git tree is at:
> git://git.kernel.org/pub/scm/linux/kernel/git/hadi/batch-lin26.git
> but i have attached the patch in case you just wanna stare.
> 
> cheers,
> jamal

Hi Jamal.  I'll be testing your patch soon, but I wanted to point out a
bug in the patch.  The patch defines TG3_SKB_CB() as follows :

#define TG3_SKB_CB(__skb) ((struct tg3_tx_cbdata *)&((__skb)->cb[0]))

This definition will collide with the VLAN macros if TG3_VLAN_TAG_USED
is set.  vlan_tx_tag_get() is defined as :

#define vlan_tx_tag_get(__skb)  (VLAN_TX_SKB_CB(__skb)->vlan_tag)

VLAN_TX_SKB_CB is defined as :

#define VLAN_TX_SKB_CB(__skb) \
        ((struct vlan_skb_tx_cookie *)&((__skb)->cb[0]))

Also, I think the count, max_per_txd, and nr_frags fields of the
tg3_tx_cbdata struct are not needed.

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