Messages in this thread | | | Date | Thu, 15 May 2008 20:09:14 +0200 | From | Jarek Poplawski <> | Subject | Re: NET_SCHED cbq dropping too many packets on a bonding interface |
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On Thu, May 15, 2008 at 06:09:36PM +0200, Patrick McHardy wrote: > Kingsley Foreman wrote: >> i just rolled back the kernel to 2.6.24 and im seeing the same thing, >> >> I was using 2.6.22 before and didn't see the problem, txqueuelen on the >> bond0 interface is 0 (the default) > > That might explain things, although it shouldn't have worked before > either. > > CBQ creates default pfifo qdiscs for its leaves, these use a limit > of txqueuelen or 1 if it is zero. So even small bursts will cause > drops. Do things improve if you set txqueuelen to a larger value > *before* configuring the qdiscs?
Kingsley wrote to me that even after changing txqueuelen to 1000 the "dropped" number didn't change much. A debugging patch with printks around all "sch->qstats.dropps++" showed only the end of cbq_enqueue(). I've asked to check tomorrow "pfifo limit 1000" for these drops too.
> Another thing is that CBQ on bond will probably not work properly > at all, it needs a real device since it measures the timing between > dequeue events for idle time estimation. On software devices this > doesn't work.
Right, but these drops without any sign of overactions or overlimits seem to show it's not about shaping (or it's not counted/documented enough).
Regards, Jarek P.
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