Messages in this thread | | | Date | Sun, 25 Aug 2002 10:00:00 -0700 | From | Ben Greear <> | Subject | Re: packet re-ordering on SMP machines. |
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Alan Cox wrote: > 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.
I would like to detect the number of pkts that such backbone hardware does re-order, so if my end machine is also re-ordering, I cannot get valid numbers.
Thanks, Ben
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-- 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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