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Gigabit network bottleneck
Dec 1, 2009, 9:39 AM
hihi. just wondering about a gigabit networking issue.
some1 asked me a while back and i don't have an answer.
a gigabit network between 2 dual-core systems with linksys gigabit nics, direct CAT-6 cross cable.
the transfer rate is maxed at around 200-300mbps, even with jumbo frame enabled. can't remember exact figure.
benchmark with iperf.
where are bottlenecks?
thx in advance
Jan 9, 2010
gigabit network bottleneck
Dec 1, 2009, 1:25 PM
Check disk fragmentation and Anti-virus settings. Let me know if that helps, also see if you have IPv6 running on both machines.
Dec 1, 2009, 11:45 PM
IPv6 not used. just IP4.
On clean install XP SP3.
Not sure about AV. I think it was NOD32.
Non-server or workstation class motherboard with only 32bit PCI. Standard desktop boards on both PCs.
thx for reply.
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Dec 4, 2009, 7:37 PM
Disk read/write access could be an issue. If in RAID-0 it may help a little.
Within Windows you can use the built-in Perf monitor to check things like CPU Utilization, Network Utilization, Disk Read/Write (IO) times.
Dec 5, 2009, 1:51 PM
My suspicion is somewhere along the bus, board or hdd IO throughput.
32bit PCI technically should be sufficient to handle that speed.
This question has been bugging me for a while. so i guess i'll just have to setup actual test platforms.
thx for the suggestions.
Dec 20, 2009, 3:45 AM
It's the BUS IO.
Jan 8, 2010, 7:43 PM
It is a mystery bugging me for months...I have two new Win7 laptops hardwired via cat6 and the max transfer speed I am getting is 20Mbps. Where is the bottleneck ..could it be the HD I/O speed?
Jan 9, 2010, 4:44 PM
I can't say my suggestions is valid for everyone, but my suspicions center around the 32bit PCI bus and data pathways.
I used RAM-to-RAM benchmarking without any hard disk, it's around 30Mbps. Occasionally maybe 40 but cannot sustain at that level. Tried Jumbo frames as well.
I only got a single 64bit PCI Bus system waiting for another 1 coming in a month or so, and didn't have time to do more tests.
What i want to do is test with PCI-Express Gigabit NICs.
The limitation problem is on the Board.
Jan 9, 2010, 4:46 PM
It's not the Cable. I got Cat6 STP running around my house
It's not solely some Registry or MTU issues.
Hard Disk can be a problem, but not significant enuf.
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