[LARTC] Determing the pfifo backlog

[LARTC] Determing the pfifo backlog

[Ioannis C Avramopoulos (iavramop@Princeton.EDU)]

Greetings --

in the "Linux Advanced Routing & Traffic Control HOWTO"
chapter 14.1 on bfifo/pfifo it says that:
"you can use this qdisc to determine the backlog on your interface".
But it does not say exactly how.

Command [#tc -s qdisc ls] outputs the number of packets sent so far
but it does not output any info about the backlog.

My first question is whether a command exists that provides info
about the backlog.

My second question is whether a system call exists that provides this
info. I would like to be able to query on the backlog at real time
and invoking the shell on each such query sounds like a lot of overhead.

Kind regards,
Yannis

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Re: [LARTC] Determing the pfifo backlog

[vincent perrier]

> My first question is whether a command exists that provides info
> about the backlog.
> 
> My second question is whether a system call exists that provides this
> info. I would like to be able to query on the backlog at real time
> and invoking the shell on each such query sounds like a lot of overhead.

If you can compile a modified kernel, you can have real time access
to the red qdisc backlog by using the soft at http://www.rawsoft.org
I also think that real time info on the queues are very important
and should be accessible in an easier way.

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