Posted: Tue Dec 03, 2013 15:49 Post subject: TL-WDR3600 intermittent slowdown WIRED
I went from stock to BrainSlayers July 2013 (22118) build of firmware.
All of this is on a wired connection to the router. The router goes to a uverse modem provisioned for 12Mbps/1.5Mbps.
On speed tests or large file downloads I would see downloads initially reach near 12Mbps, then quickly drop to near 0 for a few seconds. Then it would slowly speed back up to 8-12Mbps for anywhere from 5-20 seconds before dropping off to near 0 again.
The only thing I can think is there is some kind of buffering/congestion going on.
This is not a problem on the stock firmware, which I've gone back to.
Most likely if you will test with OpenWRT firmware you will see the same behavior.
The chaps on the openWRT forum recon that this new hardware versions are having a new switch driver and possibly it should be possible to port this driver over to dd-wrt – but I have no idea how to do that….
Reverse engineering or extracting a driver from stock hardware and then build it into the dd-wrt images is beyond my current knowledge and quite possibly requires more time investment than I can spare right now.
However, I figure we can perform a little test: if we try to load one of the earliest stock firmwares we may find the same issue, since those versions probably do not include the new driver yet?
Can re confirm your findings with the WDR3600V1.5 - downgraded stock firmware to the lowest i could find on TP Link website (firmware for Jan 2013) and can not re create the downstream intermittent issue.
guess we are back to square one...
quite a shame as i have specifically purchased this router after seeing it gets good results with dd wrt and i need the VPN server functionality.
Indeed a shame. I need a router with better CPU speed than my current linksys wrt320, but with the dd-wrt functionality like ssh, iptables, VPN.
I now have the option of using the wrt320, which maxes out at 80 mbps (not bad at all, but doesn't quite feel right if you know you can get 150) or using the netgear with stock firmware or buying yet another router. If the latter .. which one is suitable and a safe bet? Lots of supported models are old/too slow and those in beta have the risk of finding that the hardware is slightly different, or there is a different hardware version in the meantime etc. Even a fast CPU model like the link sys EA6500 now has a v2 version that is not supported (yet?).
Posted: Fri Mar 07, 2014 8:09 Post subject: WDR3600
So its seems that the chaps at OpenWRT have cracked this bug being related to the router switch (also affecting other TP Link routers) and they have applied a patch that fixes the problem - disables the energy efficient of the switch (or something similar anyway...) more details here: