netdev - Re: [PATCH iproute2] Re: HTB accuracy for high speed

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Date:	Tue, 19 May 2009 15:31:30 +0100
From:	Antonio Almeida <vexwek@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>,
	Denys Fedoryschenko <denys@...p.net.lb>
Cc:	Stephen Hemminger <shemminger@...tta.com>, netdev@...r.kernel.org,
	kaber@...sh.net, davem@...emloft.net, devik@....cz,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [PATCH iproute2] Re: HTB accuracy for high speed

I tested it with BFIFO using limit 6875000. (Analyser keeps sending
950Mbits/s of 800 bytes tcp packets - lots of drops for sure)
Backlog is now huge but the throughout stays much higher than the
configured ceil.

# tc -s -d class ls dev eth1
class htb 1:10 parent 1:2 rate 900000Kbit ceil 900000Kbit burst
113962b/8 mpu 0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level
5
 Sent 9542831672 bytes 11988482 pkt (dropped 0, overlimits 0 requeues 0)
 rate 621765Kbit 97639pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: -186 ctokens: -186

class htb 1:1 root rate 900000Kbit ceil 900000Kbit burst 113962b/8 mpu
0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level 7
 Sent 9542831672 bytes 11988482 pkt (dropped 0, overlimits 0 requeues 0)
 rate 621765Kbit 97639pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: -186 ctokens: -186

class htb 1:2 parent 1:1 rate 900000Kbit ceil 900000Kbit burst
113962b/8 mpu 0b overhead 0b cburst 113962b/8 mpu 0b overhead 0b level
6
 Sent 9542831672 bytes 11988482 pkt (dropped 0, overlimits 0 requeues 0)
 rate 621765Kbit 97639pps backlog 0b 0p requeues 0
 lended: 0 borrowed: 0 giants: 0
 tokens: -186 ctokens: -186

class htb 1:108 parent 1:10 leaf 108: prio 7 quantum 1514 rate
555000Kbit ceil 555000Kbit burst 70901b/8 mpu 0b overhead 0b cburst
70901b/8 mpu 0b overhead 0b level 0
 Sent 9549705928 bytes 11997118 pkt (dropped 6092846, overlimits 0 requeues 0)
 rate 621764Kbit 97639pps backlog 0b 8636p requeues 0
 lended: 11988482 borrowed: 0 giants: 0
 tokens: -1008 ctokens: -1008



# tc -s -d qdisc ls dev eth1
qdisc htb 1: root r2q 10 default 0 direct_packets_stat 11955 ver 3.17
 Sent 9608660872 bytes 12071182 pkt (dropped 6124502, overlimits
18190041 requeues 0)
 rate 0bit 0pps backlog 0b 8636p requeues 0
qdisc bfifo 108: parent 1:108 limit 6875000b
 Sent 9599144692 bytes 12059227 pkt (dropped 6124502, overlimits 0 requeues 0)
 rate 0bit 0pps backlog 6874256b 8636p requeues 0


  Antonio Almeida



On Tue, May 19, 2009 at 12:28 PM, Jarek Poplawski <jarkao2@...il.com> wrote:
> On Tue, May 19, 2009 at 02:21:28PM +0300, Denys Fedoryschenko wrote:
>> On Tuesday 19 May 2009 14:18:57 Jarek Poplawski wrote:
>> >
>> > Sure, if the queue is too short we could have a problem with reaching
>> > the expected rate; but here it's all backwards - it could actually
>> > "help" with the stats. ;-)
>> >
>> > Jarek P.
>> Well, i had real experience on HTB, when i set too short buffers on  my QoS
>> qdiscs, the incoming rate jumped too high than overall. When i set larger
>> buffers (and by the way dropped sfq and use bfifo) - it is dropped.  No idea
>> why, bug or specific things in  protocols congestion control. Maybe worth to
>> try...
>>
>
> Very strange. Anyway, "overlimits 0" suggests HTB always got packets
> when it needed...
>
> Jarek P.
>
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