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[xentpik]

To do a proper performance test to see what you are really getting I would use a program called IPERF which is free 

Also the other thing I would do is try changing the channel width to 20mhz instead of auto.

Also the Wireless G card should not throttle your connection down on your N card to something unbearable.

[zobaitt]

What we don't know as end users is the word N, we should also buy N devices so that you can get the max out of this N Gig router, am i right?

[brownee70]

I am glad to see someone else analyzing this issue as well. I have done testing for more than two months and have yet to get better than 4.5 MB/s transfer rate and I have good programs to test them with. If interested look up TTCP on google. I have tried Linksys WRT350N and the DIR-655 with similar results (somewhat better on DLink). I have done EVERYTHING. The only other thing that I see different from yours that made a difference for me is sticking to wireless N only. I get slight improvement using that. I have been beating my head against the wall because 270mb/s divided by 10 calculates out to 27MB/s if all else is well.

Also, what happened to the promotion of 14x speed? If you got 2.5MB/s on G then 14X2.5=35MB/S, right.  BTW, my test throughput on the router direct is about 26MB/s using Cat 6 cables. Needless to say, I am disappointed at the speed improvement on N but it is still about two times faster but very expensive to make that transition. Is it worth it, NO!

I hope that you find some other way to improve the speeds. I don't have any hair left to pull out. Good luck!!!!

[EricP]

I am glad to see someone else analyzing this issue as well. I have done testing for more than two months and have yet to get better than 4.5 MB/s transfer rate and I have good programs to test them with. If interested look up TTCP on google. I have tried Linksys WRT350N and the DIR-655 with similar results (somewhat better on DLink). I have done EVERYTHING. The only other thing that I see different from yours that made a difference for me is sticking to wireless N only. I get slight improvement using that. I have been beating my head against the wall because 270mb/s divided by 10 calculates out to 27MB/s if all else is well.

Also, what happened to the promotion of 14x speed? If you got 2.5MB/s on G then 14X2.5=35MB/S, right.  BTW, my test throughput on the router direct is about 26MB/s using Cat 6 cables. Needless to say, I am disappointed at the speed improvement on N but it is still about two times faster but very expensive to make that transition. Is it worth it, NO!

I hope that you find some other way to improve the speeds. I don't have any hair left to pull out. Good luck!!!!

270mbit wireless does NOT mean 27MB/sec throughput. Period. It sucks that they market wireless that way. My wireless N router is about 2-3x faster than my old G one when I use wireless N and a bit faster in G mode as well. For less than I paid for my old G router, it is still a good deal. I get 4-7MB/sec thru wireless N.

[Oregonian2]

270mbit wireless does NOT mean 27MB/sec throughput. Period. It [exploitive deleted] that they market wireless that way. My wireless N router is about 2-3x faster than my old G one when I use wireless N and a bit faster in G mode as well. For less than I paid for my old G router, it is still a good deal. I get 4-7MB/sec thru wireless N.

Using a DWA-552 and the DIR-655 it reports 270 or 300 mbps connections.  But pretty much like the B->G upgrades reality is less good.  Some argue that reality-based benchmarks aren't valid -- and of course that's about as far as the truth as one can get.  One gets what one gets in actual use and little else really matters.  Real use is the absolute best benchmark.  What we need the speed for is medium to large file transfer to/from a fileserver (on the LAN) to the wireless machine and I used the windows task manager networking graph to measure throughput (the 552's manager is pretty spartan, most other ones I've had in the past usually have nice little throughput graphs and the like).

We get 2~3x throughput improvement (over previous 'G' system) under the conditions above.  It's about what I expected and am satisfied even if not thrilled.

[Lycan]

In an wireless N environment, using a salvaged N650 radio from a dead DIR-635 I was able to upgrade my Tablet PC to N. With that N card in there I was able to use a Tablet with a 900Mhz cpu and a base Intel graphics adapter to stream HD movies. When benchmarked with Chariot, I saw speeds of up to 32MBps. (300 mbps connection rate).
Now, some would say that I cheated because I used a radio from a router and not an adapter, but that just leads me to believe that the reason for poor wireless performance in N mode is a combination of Drivers, the systems running the cards and the manufacturer of the radios themselves. The technology is sound, it's just an infant. These are the growing pains of Wireless N.

[EricP]

In an wireless N environment, using a salvaged N650 radio from a dead DIR-635 I was able to upgrade my Tablet PC to N. With that N card in there I was able to use a Tablet with a 900Mhz cpu and a base Intel graphics adapter to stream HD movies. When benchmarked with Chariot, I saw speeds of up to 32MBps. (300 mbps connection rate).
Now, some would say that I cheated because I used a radio from a router and not an adapter, but that just leads me to believe that the reason for poor wireless performance in N mode is a combination of Drivers, the systems running the cards and the manufacturer of the radios themselves. The technology is sound, it's just an infant. These are the growing pains of Wireless N.

If you are getting 32MB/sec with your hacked setup, why don't you just sell that to us? That's more than six times what I get.

[bspvette86]

In an wireless N environment, using a salvaged N650 radio from a dead DIR-635 I was able to upgrade my Tablet PC to N. With that N card in there I was able to use a Tablet with a 900Mhz cpu and a base Intel graphics adapter to stream HD movies. When benchmarked with Chariot, I saw speeds of up to 32MBps. (300 mbps connection rate).
Now, some would say that I cheated because I used a radio from a router and not an adapter, but that just leads me to believe that the reason for poor wireless performance in N mode is a combination of Drivers, the systems running the cards and the manufacturer of the radios themselves. The technology is sound, it's just an infant. These are the growing pains of Wireless N.

Lycan,
Uhhhhh, I don't buy it.  32MBps x 8 bits = 280 Mbps.  At 300 mbps connection rate that's 93% efficiency.  That efficiency would on par for a full duplex Wired connection not a half duplex wireless connection.  It's just not going to happen in the real world dude.   Try giving us your application data rate not your signaling rate.  Then take your setup out of the lab and into the real world where you have to contend with RF interference from all the numerous sources.

Bah humbug,
bspvette

[bspvette86]

Lycan
Just rechecked my throughput between a couple laptops with DWA-652 cards and my DIR-655 after updating to firmware 1.20.  I am still consistantly getting 70-80 Mbps Data throughput with a 300Mbps connection rate.   I'll be generous and say 80 Mbps.  Devide that by 8 and that is roughly 10MBps.  80 Mbps / 300Mbps = roughly 27% data throughput efficiency.

Now for fun, we plug the laptop with a 100 Mbps full duplex ethernet connection into our DGS-2208 switch and run the exact same test between the same systems (the other sys has Gb).  Results: 93Mbps continuously.   Thats 11.6 MBps and a data throughput efficiency of 93%.

For even more fun, we run the same test between two systems with GB NICs...   NOW we are getting in the 250-350Mbps range using either the DGS-2208 Gb switch or the DIR-655.  (might retry this with some real Gb cables)

Hence, therefore, thus,  Wireless-N can barely compete with 100BaseT and doesn't have a prayer against 1000BaseT.

It also appears you were using a WIRED Gb connection for your tests.

Cheers!
BSPvette

[EricP]

Hey, 10MB/sec through 802.11n is great. Competing with fast ethernet is the real goal for me.

[bspvette86]

Hey, 10MB/sec through 802.11n is great. Competing with fast ethernet is the real goal for me.

EricP,
If you have only two devices talking and no interference, you can get close to that goal; otherwise, you would be wise to stick to switched, full duplex, and wired.  I think alot of people think going from wireless G to N is going to give them the same 10x or 100x increase they saw going from 10Baset to 100Baset or Gb.  The best that could be achieved for N would be a 5.6X increase over G.  (300/54=5.555555)

Cheers
BV

[EricP]

I am using a $15 encore 802.11n adapter in an 802.11NG environment with multiple devices and multiple wireless networks in the area. I walked the laptop with the 802.11n adapter up the stairs and sat right next to the router and maintained a 270-300mbps connection the entire time but throughput never goes above 7MB/sec

[Lycan]

what are you using to judge the throughput speeds?

[bspvette86]

what are you using to judge the throughput speeds?

Lycan,
I am using ixia qcheck freeware edition: http://www.ixiacom.com/products/performance_applications/pa_display.php?skey=qcheck
Throughput test with 1000KB Data size
Do you have a link to the product you are using so we can use the same tools?

Regards,
BV

[Oregonian2]

Lycan,
I am using ixia qcheck freeware edition: http://www.ixiacom.com/products/performance_applications/pa_display.php?skey=qcheck

Did you find it difficult to get the qcheck freeware?  I tried using their form to get a copy (twice)
and I get zero response from them.  What's funny is that my day-job is at a company
that probably could have used their mainline software (if we don't already somewhere) so their
non-sending of the download link has been particularly un-impressive.  Does qcheck work well?
If not I'll be in less of a huff in their non-response. :-)