[Bioclusters] gigabit ethernet performance

[Chen Peng]

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Hi,

We are runing a Xserve G4 cluster with SMC gigabit switch. I found the 
network performance is not satisfactory that file transmission speed is 
always limited to 12MB/s to 13 MB/s.

To copy a 800MB file from one host (192.168.101.161) to another one 
(192.168.101.162) using FTP, it takes almost 70 seconds when the entire 
network is almost idle. I have verified all NIC and ports on the 
switch, all of them appear to be "1000base TX". And the disk IO speed 
is guaranteed to be over 40MB/s.

We expect the average speed in gigabit ethernet should be around 
30MB/s. Does any one know what might be the problem?

Thank you.

--
Chen Peng
<chenpeng@alumni.nus.edu.sg>


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Hi,


We are runing a Xserve G4 cluster with SMC gigabit switch. I found the
network performance is not satisfactory that file transmission speed
is always limited to 12MB/s to 13 MB/s.


To copy a 800MB file from one host (192.168.101.161) to another one
(192.168.101.162) using FTP, it takes almost 70 seconds when the
entire network is almost idle. I have verified all NIC and ports on
the switch, all of them appear to be "1000base TX". And the disk IO
speed is guaranteed to be over 40MB/s.


We expect the average speed in gigabit ethernet should be around
30MB/s. Does any one know what might be the problem?


Thank you.


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Chen Peng 

<<chenpeng@alumni.nus.edu.sg>


</fixed>
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