Li Chanjuan wrote:
> hi,jan:
>
> I want to do a experiment on rtnet using netem and want to know that
> how rtnet works when transmission error occurs. but after I setup rtnet,
> I use:
> #tc qdisc add dev rteth0 root netem delay 1ms
> there is error message: can't find "rteth0" device.
> I use strace to find what happened, I got:
>
> ioctl(4,SIOCGIFINDEX,{ifr_name="rteth0",..}) =-1(No such device)
>
> I think this because rtnet is invisible to Linux, so tc can not work.Exactly. > > Is it possible to use netem on rtnet? if it is, what should I do? Nope, there is no (publicly known) implementation of a netem-like service on top of RTnet. However, it shouldn't be too tricky to write such support on top of RTnet's socket API. On the other hand, I wonder why you need hard real-time guarantees for a "noise generator" like netem? Why is Linux itself unsuited? Jan
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