This is our old Q&A Site. Please post any new questions and answers at ask.wireshark.org.

Hi, I have observed an interesting throughput pattern when testing two different WiFi access points & Windows7. In both cases the radio link is perfect. FTP download throughput is always around 50% lower on one of the APs (40 vs 20Mbps).

Both APs show no dup-acks or retransmissions. Link is just perfect. The difference is that when the faster AP is used TCP window keeps increasing all the the to 1.5Mbytes, while on the slower AP the TCP window increases to 200kbytes and stays at this level.

Other differences are: Fast AP - TCP SYNC time around 40ms - Maximum segment size - 1442

Slow AP - TCP SYNC time around 30ms - Maximum segment size - 1414

Any suggestions?

Cheers, Amebcia

asked 19 Sep '13, 18:31

amebcia's gravatar image

amebcia
1111
accept rate: 0%

can you please post the two capture files somewhere (google docs, dropbox, cloudshark)?

(20 Sep '13, 00:49) Kurt Knochner ♦
Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×752
×55
×41

question asked: 19 Sep '13, 18:31

question was seen: 1,464 times

last updated: 20 Sep '13, 00:49

p​o​w​e​r​e​d by O​S​Q​A