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The Graveyard - Products No Longer Supported => Routers / COVR => DIR-825 => Topic started by: gerhard on February 08, 2010, 12:46:48 PM

Title: horrible LAN speed - SOLVED
Post by: gerhard on February 08, 2010, 12:46:48 PM
this is really disgusting, I bought this thing exactly for it's incuded GBit Switch - but the product cannot perform what it claims it can. And now I don't want to hear - "If you want to be real fast, buy an expensive GBit switch", I also have a 5 and 8 Port DLink DGS-1008/5D for ~ 20/40€, so regarding the price the DIR-825 (~100€) should be able to perform as well.
Dont buy this product, it's ****.
I'll send mine back.
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: abm100 on February 08, 2010, 12:51:05 PM
I get good speeds from the switch on the DIR-825.  I also have a couple of D-Link gigabit switches too.  I have a NAS device that tops out at about 45-48 MB/s going through both switches and the router switch.  The NAS is the limiting factor.
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: lizzi555 on February 08, 2010, 01:31:08 PM
Quote from: abm100 on February 08, 2010, 12:51:05 PM
I get good speeds from the switch on the DIR-825.  I also have a couple of D-Link gigabit switches too.  I have a NAS device that tops out at about 45-48 MB/s going through both switches and the router switch.  The NAS is the limiting factor.
Same here: more than 60 MB/S between 2 gigabit connected Windows machines. Nearly the same as with a 24 port managed switch.
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: user11 on February 08, 2010, 05:40:20 PM
Sometimes speeds can be misconstrued, it happens quite often in all markets of the digital age. If consumers are fed a line saying "up to 1Gbps speed" some do believe they should see that 1000 number when testing it, even if they were to get 125MB/s which is the theoretical cap on 1Gbps, they don't know that it is in fact performing at 1000mbps because many software tools for testing those speeds usually measure in the lower form.

Quote from: lizzi555 on February 08, 2010, 01:31:08 PM
Same here: more than 60 MB/S between 2 gigabit connected Windows machines. Nearly the same as with a 24 port managed switch.

The bold number represents a speed higher than 100Mbit and lower than 1000Mbit, but it is in the lower form 60MByte(most likely measured with software as such as well). If measured in bit it would be 480Mbit, which wouldn't be possible to obtain without the use of gigabit.
I rest my case...

There are 8 bits per byte, that is the general rule. If you have been given any speed reference in bits like 1gigabit, then you must divide that number 8 times to find the lower form in byte. eg. 1000bit/8 = 125MByte, or Cable broadband - 8Mbit/2Mbit(advertised speed) would equal 1MByte/250KByte (measurement seen in your browser)

Gigabit networking also uses all four twisted pairs within an ethernet cable as opposed to 10/100megabit, only uses two pairs. Cat 5, cat 5e. or cat 6 is required. The cable must conform to many tight specs. for proper gigabit speeds. If experiencing lower speeds than expected, test the cables, try shielded cables, or opt for cat 6.
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: gerhard on February 08, 2010, 11:33:22 PM
@user2: 13 either lower or uppercase is definitely not what I'd expect from a Gigabit-Switch. Thanks for your lesson, but I'm quite familiar with networking  ;)
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: user11 on February 09, 2010, 12:03:08 AM
Review benchmarks, thread replies, and IEEE spec. prove there is no fraud. Try return/replacement?
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: gerhard on February 09, 2010, 02:18:39 AM
I quickly checked the manual, but there is no packet forwarding rate specified :-( . I'll have to recheck that. But of course, return/replacement is an option. Unfortunately the design fits perfecty my furniture  :-) and I don't want to put an ugly device into my living room.
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: defiant on February 09, 2010, 09:57:47 AM
I tested the LAN side of my DIR-825 B1 and DGS-1005D with iperf (http://en.wikipedia.org/wiki/Iperf)

Test done with two Windows computers and the device in the middle

iperf optionsD-Link DIR-825 B1  D-Link DGS-1005D  
-t 30 -P 3 576 Mbits/sec  577 Mbits/sec  
-t 300 -P 3 572 Mbits/sec  574 Mbits/sec  
-t 30 -P 3 -d  218 + 326 Mbits/sec  224 Mbits/sec + 322 Mbits/sec  
-t 300 -P 3 -d  218 + 332 Mbits/sec  217 Mbits/sec + 329 Mbits/sec  

-t, --time      #        time in seconds to transmit
-P, --parallel  #        number of parallel client threads to run
-d, --dualtest          Do a bidirectional test simultaneously

TCP window size: 8.00 KByte (default)
Title: Re: horrible LAN speed - claiming GBit switching functionality is fraud
Post by: gerhard on February 09, 2010, 12:08:47 PM
strange. the more I investgate, the faster the speed get's :-) I changed some options for WAN speed (even though WAN is not used here), maybe that was the clue, I don't know. Checked all cables, disconnected/reconnected and now
 With Iperf I do get:
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-30.0 sec  2.97 GBytes    850 Mbits/sec  ;D ;D

which is how it should be. I really don't know what made the router perform that bad, could also be, that a cable was'nt inserted correctly. My apologies for accusing dlink.

If there would'nt be the "NTP on LAN not working" issue (which I posted to the international forum) , I'd be really happy with the product.

Thanks for all your replies