Re: [LARTC] Why SFQ does not drops packets

Linux Advanced Routing and Traffic Control

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On Fri, Jun 01, 2001 at 11:23:46PM +0300, Serguei I. Ivantsov wrote:

> Hello Ramin,
> 
> Well, let's perfom a little calculation :)
> 
> "tc -s class ls dev eth0" :
> 
> > class cbq 10:200 parent 10:1 leaf 8026: rate 16Kbit (bounded,isolated) prio 5
> >  Sent 4049872 bytes 3846 pkts (dropped 0, overlimits 10286)
> >   borrowed 0 overactions 1364 avgidle 309677 undertime 0
> 
> after 4 second :
> 
> > class cbq 10:200 parent 10:1 leaf 8026: rate 16Kbit (bounded,isolated) prio 5
> >  Sent 4049926 bytes 3847 pkts (dropped 0, overlimits 10286)
> >  rate 13bps
> >   borrowed 0 overactions 1364 avgidle 309677 undertime 0
> 
> 4049926(bytes)-4049872(bytes)=54(bytes)
> 
> 54(bytes)/4(second)=13.5 BYTES PER SECOND!

I agree. This is how the *throughput* is measured. What I meant was
when you talk about Ethernet, Fast-Ethernet, Gig-Ethernet, TokenRing,
DS3, OC3, OC48, OC192... all is expressed in bits/sec and that's
the bandwidth. The throughput can be packets/sec or bytes/sec or
bits/sec.

Ramin

> 
> It is easy to come to this conclusion when looking at MRTG graps.
> 
> -- 
> Best regards,
>  Serguei                            mailto:admin@xxxxxxxxxxxxxxxx



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