MTU was: Re: [icecast] my icecast problem
Kelly Lee Myers
k_myers at kyxpyx.com
Wed Feb 28 11:56:48 PST 2001
No, I wanted to actually make sure that every packet going out is Ethernet
frame sized or less at all times. Not bigger. Bigger at the router level
will in most cases get you dropped and not actually frag. Of course that
depends entirely the router configuration. The question again was, does
icecast actually pre-frag data chunks into these sizes before handing it to
the stack? and can you control it? The KasterBlaster server does this before
hand and I wanted to know if this was possible with icecast or if it just
tosses the data to the tcp/ip stack wanting it to do the work.
Thanks for the reply.
----- Original Message -----
From: "Sean /The RIMBoy/" <sean at rimboy.com>
To: <icecast at xiph.org>
Sent: Wednesday, February 28, 2001 11:17 AM
Subject: MTU was: Re: [icecast] my icecast problem
> It is going to depend on a number of factors. Linux sets (along with a
> few other OS's I'm sure) its MTU to 1500. The problem is, if you set it
> longer then it will most likely be frag'd by your router. If that router
> does not, then another will.
> I think MTU for ppp interfaces are smaller.
> Likewise, if your backbone is FDDI, it has a large frame (somewhere in the
> 8000 range I believe is the default).
> I'd give you some accurate numbers but the book is at home and I'm at
> work. :(
> To better answer your questions, it just depends.
> On Wed, 28 Feb 2001, Kelly Lee Myers wrote:
> > And just what exactly is an optimized sized packet? I need numbers in
> > bytes.
> > I want control over it for a very specific reason.
> > ----- Original Message -----
> > From: "Sean /The RIMBoy/" <sean at rimboy.com>
> > Sent: Wednesday, February 28, 2001 8:31 AM
> > Subject: Re: [icecast] my icecast problem
> > > On Wed, 28 Feb 2001, Kelly Lee Myers wrote:
> > >
> > > > In addition is there a way to set the size of the outgoing packets
> > > > that completely handled by the stack and not icecast itself. Forgive
> > if
> > > > that sounds stupid, but I didn't really get that deep into icecast
> > > > configuration.
> > >
> > > You can... but...
> > >
> > > Someone correct me if I'm wrong, but you want to look at the MTU for
> > > interface.
> > >
> > > However, you'll probably see little if any difference and you may
> > > performance for not only you, but your router(s) and that in turn
> > > effect your listeners. Unless you have control over the routers and
> > > what type of topology the upstream connect runs (FDDI, ATM, etc) then
> > > there is really no point in playing with the packet size. Most OS's
> > > default are already using optimized packet sizes.
> A flute with no holes is not a flute. A donut with no hole is a danish.
> --Chevy Chase, Caddyshack
> www.rimboy.com <-- Your source for the crap you know you need.
> www.rimboy.com/rimdistro/rimiradio <-- Icecast server on a floppy!
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