GB Switch and Homeplug/Router Connected = Slowdown

m4cc45

m4cc45

m4cc45

Soldato
Joined
10 Mar 2003
Posts
6,858
Hi,

This is slightly a weird one.

I have a small TP-Link GB Switch. Connected to the GB switch are my PC / NAS and a connection to a homeplug.

The other end of the homeplug is connected to my media player and my Virgin Superhub.

All of the devices are a GB and the homeplugs are Devolo 500MB AV Plus.

Now copying from my PC to the NAS (on the same switch) gets me around 50MB/s+. With the connection to the homeplug (and ultimately the router) it drops to around 25MB/s.

Any ideas why? I'd assume the router is getting un-necessarily involved?



M.
 
As described there's no obvious reason why you're seeing the reduction in speed.

Is there any chance that the router, or more likely the media player, is generating traffic that's taking disk time away from the NAS or your PC?
 
I left the media center on standby so don't believe it's that - I definitely think it's the router though.

I'll raise a call with Virgin to see if they're snooping traffic or doing something else.



M.
 
Homeplugs are Mbit, not MB, so you will only see a theoretical maximum of 62.5MB/s transfer rate. I believe that homeplugs are half duplex, dropping this rate by half. Then add overheads and any losses and the 25MB figure looks pretty realistic.

It has nothing to do with your router, calling Virgin would be a waste of time.
 
As you can see in my OP I'm not going via my homeplugs. The transfer is local. It's only when connecting my homeplugs the speed goes down (well if I leave them connected but remove the router I still get the faster speed and thus ruling out the homeplugs).

It's only when I connect the router I get the slowdown so that, to me, points to the router doing something.



M.
 
Exactly my thoughts. I had one thought which was to remove the gateway on the NAS incase that is doing something also got Windows 7 laptop to test as well so I'll rule it out one way or the other!



M.
 
The gateway should have nothing to do with it. The NAS will issue an ARP broadcast for the mac address of the machine it's streaming too, after that the network traffic happens at layer 2 through your switch. At no point will your NAS need to get off your subnet.

The only thing I can think of is if some crazy DNLA or UPNP stuff is happening.
 
Aye - will look into it - the NAS does support both - it may be that the NAS, once the internet connection is visible, is doing something crazy with updates or such like which is killing the speed and I'm not allowing it time - but this will easily be solved by removing the gateway - I'll also disable DLNA and test then remove UPNP.

I'll report back later!



M.
 
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