Look at your disks. If you run a gui on your ubuntu box, use gkrellm
with a view per-disk. You can usually tell easily with it when
something is gnawing on a disk and chugging down the system. SSD's for
personal computing made this problem go away largely for me. Using
gkrellim, you can see network i/o, proc, cpu, disks, and sorta memory
for what is hoarding. Htop is nice too for seeing what is chugging you
down.
GigE speed is a bit illusory, as it takes a lot of disk/cpu to stream
data at a sustained rate like that. Iperf tells you realistically what
your system can support across the network, using it on both lin/win to
see. It sends bits from memory, generating them faster than reading any
data and sending it via protocol, usually getting 92%-ish of the pipe if
your network supports it (in your case, nics don't suck).
Protocols vary widely for me. NFS is faster than CIFS by at least 40%,
ftp is fast when the disk being written to isn't io-locked. Use the
sysstat package and iostat to monitor disks. Tweaking with schedulers,
tcp_rmem/wmem, qos, etc helps more. Windoze use perfmon to watch disk
i/o and everything else.
Make sure you're not getting errors on your interface as well, walmart
isn't exactly the your friendly neighborhood performance networking
shop. I get bunk cables from frys occasionally still in a pinch when I
bother there.
-mb
On 02/18/2012 11:16 PM, Eric Cope wrote:
protocol matters too. SMB is very slow. FTP seems to be the best for me.
On Sat, Feb 18, 2012 at 9:43 PM, Mike Bydalek<mike.byda...@gmail.com> wrote:
What's the data you're transferring? Lots of small files (ie
pictures) or large files (ISOs, MP4s, etc)?
What's the OS of each side?
The problem could be your cable as 1000BASE-T was made to work with
Cat5, but Cat5 wasn't designed to work for 1000BASE-T.
Regards,
Mike
On Feb 18, 2012, at 9:36 PM, Derek Trotter<expat.arizo...@gmail.com> wrote:
I have two computers sitting right next to each other connected via a 6 foot
long piece of cat 5 I picked up at Wally World one day. They both have gigabit
ethernet cards in them. Both machines recognize the connection as a gigabit
connection, but I'm lucky to get half that. Most of the time I get around 40%.
Is there anything I can do to get the connection to work a bit faster?
thanks
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