[FreeNX-kNX] nx bandwidth monitoring

[Chris Fanning]

On Tue, Jun 30, 2009 at 10:23 AM, Mario Becroft<mb at gem.win.co.nz> wrote:
> Chris Fanning <christopher.fanning at gmail.com> writes:
>
>> I didn't know of iftop.
>> It has helped me understand what's happening.
>> What I have seen is that part of the problem are flash and grafically
>> active web sites. They use a lot of the available bandwidth on the
>> reserved nx adls link.
>> So I can do something about that. Maybe a cron job that gets the
>> number of running sessions from the freenx server and does some
>> traffic shaping on the fly.
>
> If you are using mozilla, it is essential that you install
> flashblock. This prevents flash from loading until the user clicks on
> it--we find that since in about 95% of cases the user does not wish to
> see the flash anyway (as it is mostly advertising), this solves the
> bandwidth-hogging problem and makes life better for users.
>
We are using flashblock. Unfortunately that doesn't stop some poeple
from activating the flash element and leaving the browser open all day
while they do other work :(
We are not many users and I am trying to educate them about this,
although that isn't really a correct solution.

> I still think you should not be running the nx server for all of your
> branch offices on an ADSL link. I expect if you moved it into a data
> centre you would notice a dramatic performance increase.
>
Yes, you are right. However, we only have an average of about 15
concurrent users. (the cluster has two desktop host nodes (I said it
was small ;) ).
Using iftop, I can see that each user uses about 4KB/s, peaking
occasionally at 40KB/s. Under these 'normal' conditions the adsl link
seems to be enough.
flash and other such sites can cause this to grow beyond 100KB/s per
user, it's that traffic I woud like to shape out.


Cheers,
Chris.

> --
> Mario Becroft <mb at gem.win.co.nz>
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