netdev - Re: [PATCH] sched: QFQ - quick fair queue scheduler (v2)

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Date:	Thu, 03 Mar 2011 16:25:40 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Fabio Checconi <fchecconi@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Luigi Rizzo <rizzo@....unipi.it>, netdev@...r.kernel.org,
	Paolo Valente <paolo.valente@...more.it>
Subject: Re: [PATCH] sched: QFQ - quick fair queue scheduler (v2)

Le jeudi 03 mars 2011 à 16:07 +0100, Fabio Checconi a écrit :

> A question on the data below:
> 
> > After a stress (and no more trafic) I still have some packets in
> > backlog:
> > 
> > (8 packets here)
> > 
> ...
> > class qfq 11:10 root weight 1600 maxpkt 2048 
> >  Sent 200 bytes 1 pkt (dropped 18181, overlimits 0 requeues 0) 
> >  rate 0bit 0pps backlog 200b 0p requeues 0 
> 
> Any other reason, apart from a bug in QFQ, why there could be 200b and
> 0p of backlog?  A packet count out of sync could explain also why you
> were experiencing problems with pfifo in presence of drops...

My packets are all 200 bytes (from my packet generator)

qfq_dump_class_stats() probably miss one line :

scl->bstats.qlen = cl->qdisc->q.qlen;



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