100Mbps Ethernet Speed/Efficiency

[Jeff Vian]

Neall wrote:

>>On Tue, 2004-04-06 at 22:18, Neall wrote:
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>>>I took the hard drives out of the picture.  I set up RAM disks on two
>>>different systems, and connected them via ethernet using NFS to cross
>>>mount them.
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>At a later time, Laurence Orchard <laurence at orchards.org.uk> wrote:
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>>have you considered putting the data file in a ram disk to overcome the
>>disk transfer overhead? assuming you have enough physical memory so you
>>don't hit swapping!
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>This is exactly what I did.  Didn't I say that? :)  The systems have 1
>GByte RAM each, and the RAM disks were set to 100 Mbytes each.  The data
>file was copied from the hard drive to the local RAM disk, then the timing
>began.  RAM disk to RAM disk, via ethernet.  Neall
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IIRC you said you did that, then said you had cross mounted the ram 
disks via NFS.  

If in fact I understood correctly, your test would have involved 
transfering the data on the network 3 tines.

Hosts involved --  Host1 & Host2

test:  Host 1 requests file from Host2

flow: NFS Host1 to Host2
          transfer Host2 to Host1
          stored (NFS Host1 to Host2)

If I misunderstood and you simply mounted the ram disks locally then it 
would be a different test and a simple one way transfer.

Jeff