netdev - Re: [PATCH 4/5] r8169: more alignment for the 0x8168

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Message-ID: <Pine.LNX.4.64.0702131730570.14346@cnc.isely.net>
Date:	Tue, 13 Feb 2007 17:32:44 -0600 (CST)
From:	Mike Isely <isely@...ly.net>
To:	Francois Romieu <romieu@...zoreil.com>
cc:	Philip Craig <philipc@...pgear.com>, Jeff Garzik <jeff@...zik.org>,
	netdev@...r.kernel.org, Mike Isely at pobox <isely@...ox.com>
Subject: Re: [PATCH 4/5] r8169: more alignment for the 0x8168

On Tue, 13 Feb 2007, Francois Romieu wrote:

> Philip Craig <philipc@...pgear.com> :
> [...]
> > This patch caused a drop in throughput from 178 Mbits/sec to 135 Mbits/sec
> > on an Intel XScale IXP465.
> 
> Which distribution of packet sizes ?
> 
> > It seems like there is some confusion about what the align parameter
> > here means. It was originally an offset from an aligned address so that
> > the IP header aligned, and this patch changes it to the alignment of the
> > ethernet header. But align is still set to NET_IP_ALIGN for some chips.
> 
> Yes, I should have distinguished both in the first place.
> 
> Can you describe which chipset from realtek the board is using (lspci -vxx) ?
> 

Francois:

Obviously I have an interest in any change here not breaking the NIC on 
my system.  So please let me know if/when you'd like me to test drive a 
candidate fix that keeps everyone happy...

  -Mike


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