[CDBUG-talk] Abysmal wireless network performance.

Chuck Atkins chuck.atkins at kitware.com
Fri Mar 5 10:00:58 EST 2010

I'm fairly certain it's not an issue with the access point, proximity to,
interference, channel, etc., since I only see the problem in FreeBSD.  Linux
WiFi on the same machine shows no degradation.

Chuck Atkins
R&D Engineer
Kitware, Inc.
(518) 371-3971 x603

-- "Mathematicians are tools for turning coffee grounds into formulas.",
Paul Erdos

On Fri, Mar 5, 2010 at 8:18 AM, Jaime <jaime at snowmoon.com> wrote:

> On Mar 5, 2010, at 4:20 AM, Chuck Atkins <chuck.atkins at kitware.com> wrote:
>  I'm seeing some very poor performance when using WiFi and I don't really
>> know where to start looking.
> Any problem will become more obvious as more traffic is placed on the link.
>  This is typically an exponential growth, too.
> Have you checked the space near your computer and near your base to see
> what other wifi networks are detectable?  Lately, I've been finding a number
> of people with bases on the same channel as a neighbor.  This might
> contribute to your problem.
> If you find this, move to another channel.  Ideally, follow the
> 3-channel-separation rule.  For example, if you see a lot of bases on
> channels 6 and 11 and one on 8, then only 1 and 2 are viable for you.  This
> is because 3, 4, and 5 are your three channels of separation from those
> bases on channel 6.
> If there are no "good" channels, find the one with the fewest and weakest
> competition for a signal near the base and your most common work spaces.
> Also, Apple's bases have a feature called "Interference Robustness."  it
> trades speed for stability (e.g. compensates for microwave ovens.)
> Lastly, look at wifi noise levels.  Any decent wifi analysis tool will tell
> you the noise level, the channel, and the signal strength.  The "real" or
> "useable" signal is the signal minus the noise.  So reducing noise can make
> a big difference.  Noise can be microwave ovens, some cordless phones, and
> other kinds of wireless equiment.
> Good luck,
> Jaime
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