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Old 04-23-2015, 11:54 PM   #1
Tim__
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Half bandwidth over wireless


I'm experiencing something kind of weird.

When I test my network speed (Speakeasy and speedtest) I get about 25/25mbps. Internally however although unmeasured it seems to be full 100mbps. Other computers and devices on wireless are getting about 50/50 mbps on the same tests. The problem is definitely specific to this laptop and specifically outside the local network.

Any thoughts?
 
Old 04-24-2015, 08:46 AM   #2
strick1226
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You say the problem is definitely specific to that laptop, and specifically outside the local network. How have you tested internal network speeds using that laptop in comparison to the other devices present? Large file copies to the same local server/machine? If so, does the local internal network speed of that laptop also seem to suffer in comparison to the other wireless devices, or is it very much within the performance range of the others?

If the laptop seems in-line with all the other wireless devices for local network speeds and functionality then I would start investigating potential issues due to differences in software configuration between that laptop and the other devices; are the other devices also running linux, or are they running Windows etc.?

I ask this as I believe the SpeakEasy speedtest utilizes Flash, which Adobe sorta abandoned on the linux platform a while back (I think it remains at 11.2). There very well could be some differences if the laptop in question is running the test using an old version of Flash through Firefox on Ubuntu compared to the other devices running Windows with current versions. (Using Chrome, which integrates current Flash builds into the browser, should solve at least that part, though--that's the easiest way to have current Flash versions on linux computers)

Good luck!


strick
 
Old 04-24-2015, 09:07 AM   #3
JeremyBoden
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Is the slow device using wireless?

Is it using the same hardware as the faster devices?

For wireless, is the signal strength identical?

Has it got a reasonable CPU?

etc...
 
Old 04-24-2015, 05:07 PM   #4
jefro
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Nic could be set to half duplex I guess. Oddly it can actually speed up data sometimes.



Not sure the test to those sites are very accurate. Try a real file transfer test back and forth to a local resource.
 
Old 04-25-2015, 09:27 AM   #5
Tim__
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Quote:
Originally Posted by JeremyBoden View Post
Is the slow device using wireless?

Is it using the same hardware as the faster devices?

For wireless, is the signal strength identical?

Has it got a reasonable CPU?

etc...
Just moved into an older house. I haven't yet retrofitted it or ran cable yet so It's still all wireless. I'll throw it onto a wired connection and let you know the difference.

This laptop had windows on it, it was getting full speed.

CPU: Intel Core i7-3630QM CPU @ 3.4GHz
 
Old 04-25-2015, 10:20 AM   #6
Tim__
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Quote:
Originally Posted by jefro View Post
Nic could be set to half duplex I guess. Oddly it can actually speed up data sometimes.



Not sure the test to those sites are very accurate. Try a real file transfer test back and forth to a local resource.
Internally I'll download a large file from my nas and let you know how it clocks.

944.2 MB file, over wireless. The nas is wired directly to the router. If it makes a difference this is an SMB share rather than NFS (which I'd heard can be slower).

Starting transfer at 10:30 on the nose.
Finished transfer at 10:35:35

So, looks like its still slow internally.


tried this (with wlan0)
http://ubuntuforums.org/showthread.php?t=2170219

Here is the result afterwards
http://www.speedtest.net/my-result/4316211140
 
Old 04-25-2015, 11:51 AM   #7
JeremyBoden
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That works out at 2.82 MB/sec
Not sure what the wireless overhead is - especially if you've got retransmissions.
I'd guess that's equivalent to about 30Mbit/sec??

How close were you to your router or wireless access point?
 
Old 04-25-2015, 12:13 PM   #8
Tim__
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Originally Posted by JeremyBoden View Post
That works out at 2.82 MB/sec
Not sure what the wireless overhead is - especially if you've got retransmissions.
I'd guess that's equivalent to about 30Mbit/sec??

How close were you to your router or wireless access point?

Roughly 10 feet or so.
 
Old 04-25-2015, 02:19 PM   #9
JeremyBoden
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It would be worth carrying out the same experiment with one of the "fast" connections.
This would rule out any PC / NAS / router speed restrictions.

I've got a very cheap NAS (just a disk in a box really) and it never gets above 5MB/sec.
 
Old 04-25-2015, 04:57 PM   #10
jefro
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Guess you could look at top when you test. Maybe try checksum offload if not already enabled and possible to do.


Try different live media to double check.
 
  


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