Gigabit Network Speed Help

sid

sid

sid

Soldato
Joined
9 Feb 2003
Posts
5,178
Location
London
Hello

I've just installed a netgear GS608 ( 1FK serial number with jumbo frame support)

I've enabled and disabled jumbo frame support and optimsed for thoroughput but i'm still getting only maximum of 25% network usage?

I thought it would be about 40% at least.

I tried a xp < xp file transfer with 3gb large file, hdds at both end at 7200.10s , 2gb ram and dual core cpus. Cpu usage is <20%

any ideas what is limiting the speeds? not the pcs from what I can see.

sid


edit/ cat5e cabling throughout.
 
growse said:
25% of gigabit = 31.25MB/s.

Sounds like it could be the write speed limit on the destination drive.
Click to expand...

impossible! 7200.10s can read/write around twice that, i have sata300 ports and hdds are functioning as normal in their respective pcs

Have other people managed better speeds with this switch?I think that may be the bottleneck here.

sid
 
Did some more tests over the past few hours,

Interestingly enough, no speed difference between vista and xp for this marvel yukon gigabit card.

Max speed is 19% on average (bursts up and down)

Any ideas why 23mb/s would be the limit for this switch?I have enabled 9k jumbo frames on all adapters and is supported as such by the switch.

Do you think there is a problem with this switch?

regards,

sid
 
Use a testing tool such as iperf to eliminate hard drive bottlenecks.

Also, what interface cards are you using (or on motherboard) and what mobos/platforms?

Depending on configuration, the data could be traversing the PCI bus which could be another bottleneck.

That said, with Intel CSA gigabit interfaces at both ends and using iperf, the most I've ever seen out of my network is around 350Mb and no higher - never worked out why.
 
Vertigo1 said:
Use a testing tool such as iperf to eliminate hard drive bottlenecks.

Also, what interface cards are you using (or on motherboard) and what mobos/platforms?

Depending on configuration, the data could be traversing the PCI bus which could be another bottleneck.

That said, with Intel CSA gigabit interfaces at both ends and using iperf, the most I've ever seen out of my network is around 350Mb and no higher - never worked out why.
Click to expand...

All onboard motherboard gigabit interfaces

So A8n32 sli with pci-3 marvel gigabit
P5n-e sli with nvidia gigabit
A8v deluxe with marvel gigabit

let me check up on iperf
 
ok i'll give it a whirl

sid

btw that iperf thing is too geek for me, is there something simpler?
 
Ok tested an FTP Server

Xliteftp server
3gb file

Flashget on the other side with 5 way split downloads and I only got 1500kb/s lol

Pulled the same file off the network share and vista said about 20MB/s which sounds like the sort of speeds I'm getting.

Still not solved where the bottle neck is :(

sid
 
OK. Worth a try.

Have you tried a direct computer to computer connection?

I.E Bypassing the switch.

This should tell you quite a lot, (i.e. whether to start on the pcs, or the switch re troubleshooting)
 
whitecrook said:
OK. Worth a try.

Have you tried a direct computer to computer connection?

I.E Bypassing the switch.

This should tell you quite a lot, (i.e. whether to start on the pcs, or the switch re troubleshooting)
Click to expand...

I can't do that, I dont have a crossover cable which is long enough :(

sid
 
doubt it needs to be cross over tobh. Most adapters these days will autosense. I.e you can use a straight cable. I do it all the time at work.
 
whitecrook said:
doubt it needs to be cross over tobh. Most adapters these days will autosense. I.e you can use a straight cable. I do it all the time at work.
Click to expand...

Still too short unfortunately :( the cables are sort of exact length to the switch.

I guess i'm not too unhappy with 25mb/s, its still a fair whack faster than 100mb lan.

The only reason for upgrading was that I may need more ports, and gigabit was only a tenner more

sid
 
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