bwm-tools-tech

[bwm-tools-tech] Experience with libnetfilter-queue

[Simon P. <dn...@gm...>]

Hi,

I'd like to ask what your experience with the libnetfilter-queue
library are. I'm planning to implement some traffic shaping app on my
own using libnetfilter-queue and I wonder how efficient it is.
bwm-tools is the first program I came across that uses
libnetfilter-queue, that's why I ask here.

Can I pipe big numbers of packets through libnetfilter-queue without
noticeable latency or should I rather do it within the kernel directly?

Thanks,
Simon

Re: [bwm-tools-tech] Experience with libnetfilter-queue

[Nigel K. <nk...@lb...>]

Hi Simon,

> I'd like to ask what your experience with the libnetfilter-queue
> library are. I'm planning to implement some traffic shaping app on my
> own using libnetfilter-queue and I wonder how efficient it is.
> bwm-tools is the first program I came across that uses
> libnetfilter-queue, that's why I ask here.
>
> Can I pipe big numbers of packets through libnetfilter-queue without
> noticeable latency or should I rather do it within the kernel directly?=

>  =20
Best thing about QUEUE is it can send only the packet headers to
userspace, in which case you ack or nack it.

I've tested it out processing about 5k pkt/s @ just under 100Mbit/s  (if
I remember correctly) on a Pentium D 2.4 with about 10-20% cpu utilizatio=
n.

-N

Re: [bwm-tools-tech] Experience with libnetfilter-queue

[Simon P. <dn...@gm...>]

> > I'd like to ask what your experience with the libnetfilter-queue
> > library are. I'm planning to implement some traffic shaping app on
> > my own using libnetfilter-queue and I wonder how efficient it is.
> Best thing about QUEUE is it can send only the packet headers to
> userspace, in which case you ack or nack it.

Is it also able to queue whole packets to userspace, which can be
mangled there and queued back to the kernel?

> I've tested it out processing about 5k pkt/s @ just under 100Mbit/s
> (if I remember correctly) on a Pentium D 2.4 with about 10-20% cpu
> utilization.

Sounds good enough for me.

Thanks!
Simon