[32582] in North American Network Operators' Group
Re: Traceroute versus other performance measurement
daemon@ATHENA.MIT.EDU (Joel Jaeggli)
Wed Nov 29 13:50:39 2000
Date: Wed, 29 Nov 2000 10:47:31 -0800 (PST)
From: Joel Jaeggli <joelja@darkwing.uoregon.edu>
To: Daniel Senie <dts@senie.com>
Cc: <smd@clock.org>, <paul@adelphia.net>, <pingpan@cs.columbia.edu>,
<nanog@merit.edu>
In-Reply-To: <0e7301c05a33$4c2503a0$0901a8c0@local.senie.com>
Message-ID: <Pine.LNX.4.30.0011291041570.10357-100000@twin.uoregon.edu>
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Errors-To: owner-nanog-outgoing@merit.edu
On Wed, 29 Nov 2000, Daniel Senie wrote:
<SNIP>
>
> All the theory sounds great. Now, you've got a customer using the utility to
> test a circuit between two boxes, and calls to complain that he's only
> seeing 1/2 of the expected bandwidth, because Pathchar tells him he's
> getting X, and we said we provisioned 2X. Perhaps it's just a customer
> education issue.
At the expense of using all their bandwidth ttcp should provide some
reasonable measure of performance under those circumstances.
> I think you're making assumptions about how load is shared on parallel
> links. Often this is done by hashing the IP address or mac address of the
> packets as a way to ensure there will be no packet reordering issues on the
> parallel links. You can send traffic until you clog one of the two pipes,
> but will never cause spill to the other link.
>
--
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Joel Jaeggli joelja@darkwing.uoregon.edu
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It is clear that the arm of criticism cannot replace the criticism of
arms. Karl Marx -- Introduction to the critique of Hegel's Philosophy of
the right, 1843.
