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

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Message-Id: <200905191404.50464.denys@visp.net.lb>
Date:	Tue, 19 May 2009 14:04:50 +0300
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	Antonio Almeida <vexwek@...il.com>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	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

On Tuesday 19 May 2009 13:55:43 Antonio Almeida wrote:
> Doesn't seem to make any diference seting HTB_HYSTERESIS to 0. Here're
> the values using #define HTB_HYSTERESIS 0
>
> 800 bytes:
> 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 9773257752 bytes 12277962 pkt (dropped 6292541, overlimits 0 requeues
> 0) rate 621796Kbit 97644pps backlog 0b 127p requeues 0
>  lended: 12277835 borrowed: 0 giants: 0
>  tokens: -7 ctokens: -7
6292541 dropped from 12277962 pkt, means 51% dropped. Maybe something fishy 
here?

Can you try instead of SFQ - BFIFO? For 100ms buffer, 550Mbit/s it will be 
~6875000 bytes bfifo.

It is by the way too short, IMHO, for this bandwidth, 127 packets is not 
enough. 127 packets with 800 bytes can buffer 1 second for 812Kbit/s only, 
and for 550Mbit/s it will buffer data for ~2ms only.


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