Messages in this thread |  | | Date | Sun, 25 Aug 2002 00:18:20 -0700 | From | Ben Greear <> | Subject | packet re-ordering on SMP machines. |
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It appears from my initial tests on 2.4.20-pre4, that packets sent on one port, and received on another port on the same machine (via a cross-over cable), can be re-ordered. I see about 2000 reordered packets per 5,000,000 packets sent (sending about 70,000 packets-per-second on a dual-port e1000 NIC.)
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?
2) Is there any standard (ie configurable) way to enforce strict ordering on an SMP system?
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)?
Thanks, Ben
-- Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
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