[PD] thoughts on Pd's networking framework

errordeveloper at gmail.com errordeveloper at gmail.com
Tue May 25 10:00:52 CEST 2010


well ..
antennas are important btw ..

but check how many networks are there in the area,
then if you could find what channels they use try to use a channel with
least number of networks ;)

but if you still don't get it ..then something is crap.
also try to setup a network between two machines ..but why do you need
wireless anyway? it's not good for this application ..

if you really wanna use it - try to disable all posible clients (make 300% sure
that there is nothing going on the network appart form you pd thing).
and as i've said - check for noise ..
and may be try with bigger antennas ;)

On Mon, May 24, 2010 at 10:51:09PM -0400, Ivica Ico Bukvic wrote:
> So, we've tried to do a series of tests using tcpserver/client as well as netserver/client and found the following:
> 
> Using either off-the-shelf wifi hardware or an industrial strength wifi router (in our case Cisco), we get unexpected lag spikes on local WLAN with 16 clients at times even exceeding 2 seconds for some of the clients.
> 
> Network connection in these tests was unencrypted.
> 
> Packets tested were small to medium using both UDP and TCP (from a single number, up to a sentence, plus a couple numbers).
> 
> When using off-the-shelf router we even had clients drop connections to the router in a high-traffic context. By using an industry strength router these took much longer to occur (but have still nonetheless occurred).
> 
> So, with the router being less likely of a culprit I am wondering what is causing these spikes?
> 
> Without looking closely at Pd's network code one suggested culprit by a CS colleague might be how Pd reuses ports and a possibility of it starving the router. Is this possible?
> 
> The problem is apparent when sending sporadic TCP packets to all 16 machines as well as when using both UDP and TCP connections.
> 
> One last thought is whether there might be something on the router settings that would make this an issue in both cases.
> 
> Any thoughts on this would be most appreciated.
> 
> Ivica Ico Bukvic, D.M.A.
> Composition, Music Technology
> Director, DISIS Interactive Sound & Intermedia Studio
> Director, L2Ork Linux Laptop Orchestra
> Assistant Co-Director, CCTAD
> CHCI, CS, and Art (by courtesy)
> Virginia Tech
> Dept. of Music - 0240
> Blacksburg, VA 24061
> (540) 231-6139
> (540) 231-5034 (fax)
> ico at vt.edu
> http://www.music.vt.edu/faculty/bukvic/
> 
> 
> 
> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list




More information about the Pd-list mailing list