From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Date: Fri, 19 Sep 2003 04:43:15 +0000 Subject: Re: NS83820 2.6.0-test5 driver seems unstable on IA64 Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org On Thu, Sep 18, 2003 at 09:38:47PM -0700, Grant Grundler wrote: > On Fri, Sep 19, 2003 at 02:16:29PM +1000, Peter Chubb wrote: > > The obvious approach of realigning the SKB by 2 bytes seems not to > > work. > > Could you be more detailed about the "obvious approach"? > ie show the diff of what you changed. > > Several other NIC driver "alias" (as davidm describes it) the buffer > by reserving two bytes at the beginning of the recieve buffer > where header and payload data are DMAd on inbound traffic. It is a mixed blessing, because the result is a non cache line aligned buffer. Some NIC chipsets don't like this because they have to do a read-modify-write cycle for the first cache line and cannot burst the full packet. -Andi