Re[2]: [LARTC] Why SFQ does not drops packets

Linux Advanced Routing and Traffic Control

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Hello Ramin,

Friday, June 01, 2001, 8:41:52 PM, you wrote:

RA> On Fri, Jun 01, 2001 at 02:41:47PM -0300, Ethy H. Brito wrote:

>> On Fri, 1 Jun 2001, Wingtung.Leung wrote:
>> 
>> > On Fri, 1 Jun 2001, Serguei I. Ivantsov wrote:
>> >
>> > > Please explain me why my class 10:300 does not drops packets?
>> > > My class is bounded and isolated - but 8kbit!=1783bps!!!
>> > >
>> > >
>> > > class cbq 10:300 parent 10:1 leaf 801b: rate 8Kbit (bounded,isolated) prio 5
>> > >  Sent 470737 bytes 388 pkts (dropped 0, overlimits 7465)
>> > >  rate 1783bps 1pps backlog 40p
>> > >   borrowed 0 overactions 290 avgidle -786633 undertime 612289
>> >
>> > I'm not sure what 1783bps means. If it is "bytes/sec" more packets should
>> > be dropped, if it is "bits/sec", everything seems to be ok.
>> 
>> As a general rule "bps" means bits per second and "Bps" means bytes per second.
>> I am not shure if it applies here. I should say it does.

RA> Usually, when one talks about the bandwidth it always refers to "bit"
RA> not "byte".

RA> Ramin


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RA> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://ds9a.nl/2.4Routing/

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!

It is easy to come to this conclusion when looking at MRTG graps.

-- 
Best regards,
 Serguei                            mailto:admin@xxxxxxxxxxxxxxxx





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