Messages in this thread | | | Date | Fri, 19 Sep 2003 06:43:15 +0200 | From | Andi Kleen <> | Subject | Re: NS83820 2.6.0-test5 driver seems unstable on IA64 |
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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.
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