lkml.org 
[lkml]   [2006]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: want to randomly drop packets based on percent


Stephen Hemminger wrote:

>O
>
>
>>>>>>I wanted to insert artificial packet loss based on a percent so i found:
>>>>>>network emulab qdisc could do it, so i compiled support into the kernel
>>>>>>and tried:
>>>>>>tc qdisc change dev eth0 root netem loss .1%
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>> ^^^^^^
>>>
>>>You need to do add not change. Add will set the queue discipline
>>>to netem (default is pfifo_fast). Change is for changing netem parameters
>>>after it is loaded.
>>>
>>>
>>>
>>>
>>>
>>bahhh I see... the wiki has "change" instead of add. Now i'm running
>>into another problem, I have an XCP qdisc that I have already added via:
>>tc qdisc add dev ath0 root xcp capacity 54Mbit size 500
>>
>>
>>
>
>Wiki reads as a set of examples. First uses, "add" after that "change".
>
>
>
>
>>therefore when I also try to incorperate loss:
>>tcq disc add dev ath0 root netem loss .1%
>>
>>I get:
>>RTNETLINK answers: File exists
>>
>>Is it possible to use two qdiscs on the same interface?
>>
>>
>>
>
>No, but netem is "classful" so you can put xcp inside netem.
>Look at the token bucket example on the wiki.
>
>
>
Sorry, I was looking at the LARTC guide, completely skipped over the
blatently obvious block of commands you were pointing me too :P

Thanks!
George
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-04-18 01:10    [W:1.937 / U:0.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site