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Re: Zebra/linux device production networking? (summary)

  • From: Stephen Stuart
  • Date: Wed Jun 07 15:36:42 2006

> I've seen confliction on if *bsd or linux is better, this (hopefully) 
> isn't that surprising to anyone.

You should do a PPS throughput analysis of your own to see which OS
works better on the hardware that you plan to use. Drivers, and the
susceptibility of the kernel to livelock, are where there may be
differences in performance.

> Finally, it appears as if, contrary to what the articles are saying, not 
> many people are actively considering such a move. However, it is more 
> common in smaller businesses starting new locations or building out.

DEC's gateway to the Internet ran on host-based routers - DEC Alphas
running Digital UNIX with turbochannel FDDI cards - from 1994 to
sometime in 1999-ish (I stopped being responsible for it in 1998). I
started with a pair and had suffered one all-night upgrade to eight
when the PPS load of some AltaVista announcement pushed the pair over
the edge into livelock.

> What about better case situations?* IE:
> 
> toe cards

TOE won't help you, you aren't terminating TCP sessions on the box. At
least you shouldn't be. Don't let anyone talk you into also running a
web server. 

> custom kernel

This could be useful, if the kernel is able to handle all packet
forwarding in the interrupt or polling input service routine.

> no moving parts (ie: hard drive, maybe fans if possible)

That'll certainly help with reliability, as well as dual power
supplies.

> up-to-date software packages with internal coders to fix ugly bugs, etc
> actual research into what packages & hardware would be best

Both of those things, or a support agreement from one of the vendors
that's trying to make the host-based open-source router business model
work.

Stephen




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