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<DIV><FONT face=Arial size=2>I have already set the packet size as large as the
windows driver allow - MTU = 7 Kb</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>But coping from a very high speed disk, or RAM
drive is certainly a good question.</FONT></DIV>
<DIV><FONT face=Arial size=2>Is the limitation the ethernet, PCI bus, hard
driver controller, or the hard drive itself????</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Hmmm, me thinks an experiment or two is in the
wind!</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tim@timschoenfelder.com href="mailto:tim@timschoenfelder.com">Tim
Schoenfelder</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=rhn-users@redhat.com
href="mailto:rhn-users@redhat.com">Red Hat Network Users List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 21, 2006 1:37
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [rhn-users] Gigabit transfer
speeds</DIV>
<DIV><BR></DIV>Increase your packet size...<BR><BR>One of our networking class
projects a couple years ago was to benchmark gigibit ethernet transfer
speeds. <BR><BR>I benchmarked 700mb/s+ between two Linux PCs which was
reasonable to our instructor. <BR><BR>He emphasized that the brand/chipset of
cards made a big difference ( it wasn't the most expensive that performed best
... ) as well as the drivers.<BR><BR>Some of his published tests as described
below show that you can achieve at least 700mb/s even with 32bit Netgear
GA622T cards as illustrated in a ps link from his website: <BR><BR><A
href="http://www.cs.uni.edu/~gray/">http://www.cs.uni.edu/~gray/</A><BR><BR>Benchmark
project links:<BR><A
href="http://www.cs.uni.edu/~gray/gig-over-copper/">http://www.cs.uni.edu/~gray/gig-over-copper/</A><BR><A
href="http://www.cs.uni.edu/~gray/gig-over-copper/gig-over-copper.html">http://www.cs.uni.edu/~gray/gig-over-copper/gig-over-copper.html</A><BR><BR>PS
file showing performance benchmarks ( note 700mb/s+ requires packet size of
100k+ bytes ): <BR><BR><A
href="http://www.cs.uni.edu/~gray/gig-over-copper/hsln-lcn.ps">http://www.cs.uni.edu/~gray/gig-over-copper/hsln-lcn.ps</A><BR><BR>Tim<BR><BR>
<DIV><SPAN class=gmail_quote>On 8/21/06, <B class=gmail_sendername>Corne
Beerse</B> <<A href="mailto:cbeerse@gmail.com">cbeerse@gmail.com</A>>
wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">Dan
Hunter wrote:<BR><BR>> I regularly move large files from a windows XP
machine to a Fedora<BR>> Core 5 machine.<BR>> To avoid bothering other
network users, I purchased two Linksys EG1032<BR>> gigabit ether net
cards. <BR>> The cards have been installed. a direct PC to PC
gigabit cross over<BR>> cable connects them.<BR>> A separate set of IP
address have been set up.<BR>> I can verify that data is being transfered
over the gigabit cable with <BR>> windows task manager.<BR>><BR>>
Transfers over the 10/100 link show up at 82 or 83 percent - about
80<BR>> Mbps.<BR>> Transfers over the gigabit link show up at 20 to 26
percent - about<BR>> 230 Mbps. <BR>><BR>> What do I have set up
wrong?<BR>><BR>><BR>Your expectations are to high. If you have about
20% utilisation with a<BR>Gbit nic, I'd say you are doing verry
nice.<BR><BR>With the move to gigabit networking, the nic is no longer the
<BR>bottleneck. If you move data from disk on one machine or to disk on
an<BR>other, the disk-controllers, disk interfaces or even the actual
disks<BR>are most likely the bottlenecks. Then, the disk does not need to be
the <BR>bottleneck. Think about the speed of internal busses and for which
they<BR>are used while you are dumping
data...<BR><BR><BR>CBee<BR><BR>_______________________________________________<BR>rhn-users
mailing list<BR><A
href="mailto:rhn-users@redhat.com">rhn-users@redhat.com</A><BR><A
href="https://www.redhat.com/mailman/listinfo/rhn-users">https://www.redhat.com/mailman/listinfo/rhn-users</A><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>Tim Schoenfelder<BR><A
href="http://timschoenfelder.com">http://timschoenfelder.com</A>
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