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Re: tg3 support broken on PPC, a workaround

from [Rick Jones] [Permanent Link][Original]
To: netdev@xxxxxxxxxxx
Subject: Re: tg3 support broken on PPC, a workaround
From: Rick Jones <rick.jones2@xxxxxx>
Date: Tue, 10 May 2005 15:13:25 -0700
Cc: Grant Grundler <iod00d@xxxxxx>
In-reply-to: <20050510.121214.39158393.davem@davemloft.net>
References: <20050510113308.kbjo3ob1ck0404k8@158.49.151.11> <1115743966.8570.26.camel@rh4> <20050510.121214.39158393.davem@davemloft.net>
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; HP-UX 9000/785; en-US; rv:1.6) Gecko/20040304
David S. Miller wrote: 
We really should be disconnecting at single cacheline boundaries
on RISC systems.  The PCI controllers on RISC machines are
going to disconnect the tg3 when it crosses a cache line
boundary, so all these setting do is waste PCI bandwidth.

It is my understanding that PA-RISC and IA64 controllers behave differently. For confirmation one way or the other, I've cc'd someone who could talk about it much more cogently than I.

rick jones

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