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[naughticl]

I might be shooting myself in the foot here, as my network is running well. But there is no gigabit speed going on.

Two desktop machines with gigabit capability are hardwired to the 655, and I'd like to get fast transfers between them.

The other 2 ports on the 655 go to non-gigabit devices:  a Vonage D-Link VOIP box, and a 100Mb switch, which then connects to a DVR, and a couple more non-gigabit machines.

Does having 100Mb devices plugged in stop all gigabit transfers from hitting speed?

With the 655 set to "N" wireless, I've been unable to connect with "G" machines. To get them all to connect I've had to limit the router to "G" only. Is there a workaround for that?

Are these things related??

thnx!

[Sammydad1]

Hi,

As for thwe wireless, you should be able to set the router to NG mode to get access to both N and G wireless at their own speeds.  At least it works here that way.

And I believe Yes is the answer your non Gigabit speed issue on your wired ports.  but I have non-Gb wired on my router and I still show 1 Gb connection on my only Gb enabled wired pc....but it slows down to the lowest common denominator (speed-wise) when in use as far as viewable performance (during actual file copy actions or such) is concerned.

If you aren't even seeing Gb speed on the wired ports you are expecting to see it on, then try using a different cable perhaps , and make sure the PC's driver and its settings are set for Gb use.


SD1

[naughticl]

OK, thanks for that. But...

If 2 wired machines are gigabit-enabled, should I not be able to transfer files between them at speeds approaching gigabit, even if other devices on the network are 100Mb only?

[rydude]

Make sure you are not running Cat5 cabling on your gigabit machines as they are not gigabit capable cables.  Cat5 maxes out at 100mbps.  You must have either Cat5e or Cat6 cabling to achieve gigabit speeds.

OK, thanks for that. But...

If 2 wired machines are gigabit-enabled, should I not be able to transfer files between them at speeds approaching gigabit, even if other devices on the network are 100Mb only?

[coppertrail]

To add to the cabling specs, the line speed/duplex on the Gb NIC cards should be set to Auto Detect.

[blainem]

IMHO it is probably not the network hardware that is limiting your measured performance.  I am curious how you are measuring the performance though and what you are actually getting.

You will never see 1 Gb/s measured performance on an Ethernet network since there is overhead with Ethernet (physical layer), TCP/IP and other layers of the network protocol stack.  These will influence measured performance (sort of like the space that is lost on a hard disk when formatting for use with Windows.)

You are also limited by the speed of your system, particularly the disk sub system.  I have no idea what sort of disk you are running but I just checked the very fast WD raptor (10,00 RPM) and the sustained transfer speed is 84 megabytes/s, or approximately 840 megabits/s (.84 Gb/s) accounting for the overhead of error checking and such.   If the rest of the machine is fast enough to keep up, this is the fastest transfer rate you could theoretically achieve.  This is limited further by disk fragmentation, seek time, other network traffic, etc.

Cheers

[Lycan]

Couldn't have said it better myself.
 

[naughticl]

Thanks all. Cabling is all CAT-5e, all new, all point-to-point, and installed personally to ensure no screw-ups. It's all done with wide-ratio bends, isolated from other signals, and terminated in wall plates. It's been tested and verified. I wasn't expecting gigabit transfer rates, just noticeably faster moves than on 100Mb. I'll keep poking at it.

As to the wireless, will have to upgrade one last PPC to 'g', it seems. Have had to keep 'b' functional to keep that little anchor online.