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10/100MB Network speed question

V

vdg

Member
I have 3 computers connected through a SWITCH using cables CAT5. The network cards are different brands(Linksys,Compaq,Intel) but all of them are 10/100MB.
I' am running win2k on 2 of them and Solaris on the other one.
The NIC setup in all the OS-s is 100MB full duplex and I can see on the switch that is OK: it has some lights saying what type of connection it is(100,10,half or full duplex)

..with all this setup I cannot get more than 700-800KBs transfer rate between them..and I have no ideea why!!!

I tried to setup the NIC-s on AUTO detection and I got the same results as when are setup with 100 full duplex...700-800Kbs

any ideea what can be wrong???

vdg
 
What do you mean Full-duplex is slower!? full-duplex mode allows the system to send and receive at the same time, so bandwidth goes up to 200mb/s. But one way transfers are still at 100mb/s. Also remember that 1 byte is eight bits so a 100mbit/s transfer is 12.5 mbytes/s. Real world transfers are always bellow the rated speeds but it seems like your network is running at 10mb/s speeds. Is your switch a 10/100 auto negotiating switch? Brand? ou should post this at the Networking board, lots of network savvy people over there.
 
ok here is the rule:

if the card supports it, do this:

<example: Type of connection / cable speed-type>
Full Duplex / 100 MB Full Duplex
Half Duplex / 100 MB Half Duplex
Auto / Auto

Try it in Auto / auto and see what happens.
 
Guys..I tried all the settings possible and still is slow...AUTO/AUTO is giving me the same speed.
The switch is D-link 8 port with 10/100 auto negotiating .

I give up on this one...really🙁
 
Turning on full duplex on a Fast Ethernet link may actually cause slower response times than half duplex. Due to some incompatibilities between Fast Ethernet cards and switches, enabling full duplex can result in the retransmission of packets. The most common symptom of this problem is an abundance of alignment errors on the switch port.

Many of these errors occur when full duplex is implemented using a switch from one vendor and a network interface card from another. Each time an alignment error occurs, the sending station must wait the retransmission timeout and resend the packet. This can result in drastic decreases in throughput.

When setting the mode on the switch and the NIC, force both to half duplex, auto-detection is not always a sure guarantee the negotiation will result in half duplex.

 
Try to disconnect one pc from the hub and see if it speeds it up. One of your network cards could be running at 10 MBS, causing the HUB to switch to that speed
 
yea, streaming a dvd over a 100mb/s shouldn't be that tough ...

Assuming an hour and a half movie ..
12.5MB/s * 60 seconds * 90 minutes = 67500MB

Now, unless I'm mistaken, DVDs don't hold 67.5 GB of data ;-)

randal
 
Whats the Processor speed and the HD type of the PCs? If there's a lot of Disk activity, it will definitely slow down the transfer, especially in older HDs. Lots of apps running might slow the cpu which in turn might slow off the transfer rate as well.
 
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