mailing list archives
Re: Which is more efficient?
From: "Josh Potter" <joshpotter () gmail com>
Date: Wed, 14 Jan 2009 17:11:51 -0600
What type of traffic are you looking at sending?
As Scott said smaller payloads that need to be sent quickly work out well in
fixed cells but larger payloads would be better off in variable sized
Also are you looking at simple data transmission rates or are you wanting to
factor in hardware load, backplane load, cpu efficiency etc?
On Wed, Jan 14, 2009 at 4:59 PM, Scott Berkman <scott.berkman () reignmaker net
Packets can have a max size as well based on the path MTU, such as 1500
bytes in an Ethernet (10/100) link. I think there are a lot of other
variables here such as are you billed per data unit, bandwidth and control
factors on the links, and what type of data is being sent.
If your data can always fit in a smaller N-byte cell, that can be quite
efficient since you have minimal overhead or wasted space and all the
benefits of the fixed length data unit from a processing standpoint.
If you are constantly fragmenting and then having to reassemble data due
to the small cell size, you would be better off with a variable length
packet, especially when bandwidth is less in demand than processing power.
From: Murphy, Jay, DOH [mailto:Jay.Murphy () state nm us]
Sent: Wednesday, January 14, 2009 3:56 PM
To: nanog () nanog org
Subject: Which is more efficient?
In your humble opinion, which transmission method is more efficient,
packet or cell? Granted a cell is a fixed length packet and an IP packet
is variable length....would this necessarily only relate to a specific
protocol, namely, cell in ATM, and IP in Ethernet or other types of
domains....feedback highly welcomed. Trying to make a decision on the
transport mode for cost, delay, jitter, ROI, etcetera.
IP Network Specialist
NM Department of Health
ITSD - IP Network Operations
Santa Fé, New México 87502
Bus. Ph.: 505.827.2851
"We move the information that moves your world."
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