On Thu, Dec 06, 2007 at 10:18:47PM -0500, Hansang Bae wrote:
> Reynolds, Tom wrote:[snip: moving datacenter. using ftp to test the
> throughput]
> >
> > Downloads and uploads (from a DSL line) to Philadelphia. Everything is
> > great. We get a solid 3 Mb/s download and a solid 750k upload.
> >
> > Downloads from Valley Forge to the DSL line are very poor, with almost
> > double the time to download the same 10 MB file. There are frequent
> > drops from the 3Mb/s range to about 500k. I have actually seen worse
> > than this.
> >
> > After looking at the sniffer logs, here is what I see: (middle 10
> > packets 8950-8959, right about the time of the bandwidth drops).
> > Note that I am getting a ton of:
> > TCP Previous segment lost
> > TCP Dup ACK
> > TCP Retransmission
Have you checked the physical port settings for the servers and switches
in Valley Forge? It could just be the server on fixed (100Mb/Full duplex?)
and the switch on auto (or vice versa).
Do you have multiple servers at Valley Forge? Do they have good network
performance between them?
Cheers,
Sake
