Re: [LARTC] Re: [PATCH 2.6] update to network emulation QOS scheduler

From: Ed Wildgoose <lists@wildgooses.com>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: netdev@oss.sgi.com, lartc@mailman.ds9a.nl
Subject: Re: [LARTC] Re: [PATCH 2.6] update to network emulation QOS scheduler
Date: Sat, 03 Jul 2004 13:32:17 +0000	[thread overview]
Message-ID: <40E6B561.4050200@wildgooses.com> (raw)
In-Reply-To: <20040702134437.5891e998@dell_ss3.pdx.osdl.net>

>Here is an enhancement to netem to do allow emulating lower speed 
>networks.  The resolution is close, but obviously limited by the
>granularity of timers and size of packets.
>  
>

Hi Stephen,

This looks extremely useful.

I have a need for a simulator for the Iridium Satellite phone network, 
this is at most 2,400 baud with perhaps 1 sec or more latency.  Do you 
expect this scheduler to be able to do this slow?

On a related note, for better accuracy I currently need a bit of 
stochastic variability on the latency, ie assume a 1 sec min delay, but 
also to vary that a little through time.  Have you considered adding 
that as a feature?

Thanks

Ed W

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