Messages in this thread | | | Subject | Re: packet re-ordering on SMP machines. | From | Alan Cox <> | Date | 25 Aug 2002 15:41:13 +0100 |
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On Sun, 2002-08-25 at 08:18, Ben Greear wrote: > By re-ordered, I mean that a method called from process_backlog in dev.c > is being handed packets in a different order than they are being poked into > the driver with hard_start_xmit on the other interface. If each CPU can be running the > process_backlog, then I can see how this could be happening. > > > 1) Is this expected behaviour? Yes
> 2) Is there any standard (ie configurable) way to enforce strict ordering on an > SMP system? No
> 3) If answer to 2 is no, would you all be interested in a patch that > did allow strict ordering (if indeed I can figure out how to write one)?
You should never need it. Ethernet, hubs, switches, routers, internet backbones etc will all cause packet re-ordering. You should also expect the percentage of re-ordered frames on the net to rise and rise.
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