Network Speed issues on Fedora 12

Bill Davidsen davidsen at
Sat Jun 5 23:28:35 UTC 2010

alan wrote:
> I have a couple of systems with gigabit ethernet cards. If I copy a large 
> quantity of data to the machine I notice the data throughput start to fall 
> off after about 4-5 gigs. It keeps getting slower and slower the more data 
> that flows through the interface.
And drops to the sustained write speed of your drive(s) you're writing.

> This happens on x86_64 and i386. A similar Ubuntu system does not show the 
> problem.
Are you using LVM on one system or the other?

> If I run the Fedora 12 system under VMWare, I still see the problem. 
> Windows Server 2008 runs fine on the same VMWare server.
> Any ideas here? This has been driving me mad and I have seen nothing 
> useful on this issue in my various Google searches.
> Thanks!

Bill Davidsen <davidsen at>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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