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TCP Packet Count
10-18-2011, 12:44 AM
Post: #1
TCP Packet Count
Another random request/thought

When looking at a client site (using a locally hosted version of webpagetest) we noticed some strange artefacts in the results.

For certain items we were getting large content download times. These download times were inconsistent with the size of the object being downloaded (e.g. a 2K file taking approximately 2 seconds to download over 1.5 Mbps ADSL)

One of the things that we were playing with on the network equipment was disabling of the Nagle algorithm. This set me wondering whether I was seeing an effect caused by this network parameter change.

My hypothesis is that the object is being sent in a large number of rather empty packets rather than being buffered (by the Nagle algorithm) and sent on efficiently packed packets. Since we are using the packet shaping feature I was curious as to whether the packets were received serially and the artificial delay added was exaggerating the time to download.

It would be useful to be able to know the packet count received for each object so that the impact of enabling/disabling the Nagle algorithm (a valid WPO technique) could be examined without resorting to a packet sniffer.

I did check the raw data first this time and couldn't find a relevant column. :-)

Cal
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Messages In This Thread
TCP Packet Count - calumfodder - 10-18-2011 12:44 AM
RE: TCP Packet Count - pmeenan - 10-18-2011, 02:11 AM
RE: TCP Packet Count - calumfodder - 10-18-2011, 03:39 AM
RE: TCP Packet Count - pmeenan - 10-18-2011, 03:45 AM
RE: TCP Packet Count - calumfodder - 10-18-2011, 03:49 AM
RE: TCP Packet Count - pmeenan - 10-18-2011, 04:20 AM
RE: TCP Packet Count - allissa - 01-21-2012, 01:25 AM

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