RV042G Giving Poor Performance

[work_permit]

SMB and its companion forums are great sites. I've been lurking in these forums and they've helped me alot. Now I'm stuck, and hope some of you can help.

My RV042G is giving me roughly 130 Mbps maximum throughput WAN->LAN (download) on a WAN link rated for 300 Mbps. I've used both speedtest and verizons downlink test site, and get similar results. Using Verizons Actiontec router, I am able to achieve the rated link speed from either site.

I've tried disabling SPI, and of course testing with only one computer connected directly to the router. There's a thread over at cisco's support community where another user is achieving similarly bad real world results. SMB was able to achieve >600 Mbps in their lab test.

Are these results that should be expected? Am I doing something stupid? Do I have a bad unit? Or is there that much discrepency between SMB lab tests and real world results?

 

[thiggins]

Our tests use IxChariot on a private LAN, so are ideal best cases with very few variables to deal with.

Perhaps WAN MTU is different for the two routers?

 

[david7eagle]

Speed Tests

Hello there,

I setup a RV042G and two computers running jperf. Other than forwarding port 5001 to the internal computer and setting a static IP address on the WAN port, the setup was default.

Jperf reported a around 130 Mbps total throughput. However, when I increased the Windows size in Jperf to 64 KBps, total throughput increased to an average of 400-425 Mbps.

I am investigating this further and will be contacting you shortly.

-davidagu (at) cisco (dot) com

 

[work_permit]

Thank you both for your replies.

Tim, I've tried manually setting MTU to 1500, 1492 and 1440 as well as having the router automatically assign set the MTU. Results were similar in all cases.

Dave, your results sound interesting. I found this website which may offer more clues:

http://www.speedguide.net/articles/windows-7-vista-2008-tweaks-2574

Perhaps the rv042g doesn't play well with MS Windows TCP auto-tuning?

 

[tipstir]

I've sent you what I have mine configured under Windows 7 H-64BT the last line is what you need. 7 32-bit nor 64-bit will needs a patch for that to be enabled. Otherwise it won't be. But it's available by default under Windows 8 set to 3000 which default. Some set it to 600 for BT connects but I don't recommend doing that.

 

[work_permit]

Thanks Tipster. Where would I get a patch for windows 7-64bit?

 

[thiggins]

I made no TCP adjustments to the Win 7 computers used for the test.

Changing iperf/jperf Window size usually provides higher throughput.
http://www.smallnetbuilder.com/lanwan/lanwan-howto/30408-measuring-network-performance-jperf