netdev - Re: tbf/htb qdisc limitations

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Date:	Sat, 16 Oct 2010 00:05:35 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Bill Fink <billfink@...dspring.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Rick Jones <rick.jones2@...com>,
	Steven Brudenell <steven.brudenell@...il.com>,
	netdev@...r.kernel.org
Subject: Re: tbf/htb qdisc limitations

On Fri, Oct 15, 2010 at 05:37:46PM -0400, Bill Fink wrote:
...
> i7test7% tc -s -d qdisc show dev eth2
> qdisc prio 1: root refcnt 33 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>  Sent 11028687119 bytes 1223828 pkt (dropped 293, overlimits 0 requeues 0) 
>  backlog 0b 0p requeues 0 
> qdisc tbf 10: parent 1:1 rate 8900Mbit burst 1112500b/64 mpu 0b lat 4295.0s 
>  Sent 11028687077 bytes 1223827 pkt (dropped 293, overlimits 593 requeues 0) 
>  backlog 0b 0p requeues 0 
> 
> I'm not sure how you can have so many dropped but not have
> any TCP retransmissions (or not show up as requeues).  But
> there's probably something basic I just don't understand
> about how all this stuff works.

Me either, but it seems higher "limit" might help with these drops.

Jarek P.
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