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Date: Tue, 15 Jan 2008 22:15:26 +0100 From: Jarek Poplawski <jarkao2@...il.com> To: Patrick McHardy <kaber@...sh.net> CC: Badalian Vyacheslav <slavon@...telecom.ru>, netdev@...r.kernel.org Subject: Re: Packetlost when "tc qdisc del dev eth0 root" Patrick McHardy wrote, On 01/15/2008 05:05 PM: > Badalian Vyacheslav wrote: ... > Yes, packets in the old qdisc are lost. > >> Maybe if tc do changes - need create second queue (hash of rules or how >> you named it?) and do changes at it. Then replace old queue rules by >> created new. >> Logic - >> 1. Do snapshot >> 2. Do changes in shapshot >> 3. All new packets go to snapshot >> 4. If old queue not have packets - delete it. >> 5. Snapshot its default. > > > That doesn't really work since qdiscs keep internal state that > in large parts depends on the packets queued. Take the qlen as > a simple example, the new qdisc doesn't know about the packets > in the old one and will exceed the limit. But, some similar alternative to killing packets 'to death' could be imagined, I suppose (in the future, of course!). So, e.g. doing the switch automatically after last packet has been dequeued (maybe even with some 'special' function/mode for this). After all even with accuracy lost, it could be less visible for clients than current way? Regards, Jarek P. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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