Re: What LAN speeds can I expect?
- From: Randy Howard <randyhoward@xxxxxxxxxxxxxxxxx>
- Date: Thu, 06 Mar 2008 16:05:19 GMT
On Tue, 4 Mar 2008 23:15:40 -0600, Stephanie wrote
(in article <0001HW.C3F36C7C007B5E50B01AD9AF@xxxxxxxxxxxxxxxxxxxxx>):
We just upgraded the office network, pulling new cat-5e cable over the
suspended ceiling and into the walls. All connections use quality hardware.
The gigabit switch is a LinkSys SR2024:
<http://tinyurl.com/39s8xr>
The computers are 1-year-old Dell desktops running a mix of Win XP and 2K.
These have Intel brand gigabit NICs installed.
There is nothing between computers on the LAN except the SR2024.
When copying a test file between computers, we're seeing 10-12
megabytes/second. This isn't anywhere near what I was expecting.
It also depends upon the hard drive(s) involved on each end, there are
not a lot of desktop hard disk setups capable of saturating a gig-E
connection one way, much less in both directions.
If the local hard drive can't be read from or written to at 125MB/s,
then you can't expect it to pump data over the network that quickly
either. Most desktop drives fall far short of that. Next stack on
variables like file system cluster size, overhead of virus scanning
software, firewalls, etc.
File copying might have been useful for testing network throughput back
when networks were slower than local storage I/O, but it's not with
GigE in general. You would typically need a pretty good RAID setup
with a fair number of spindles to get there.
I realize
that 1 gigabit speeds are only theoretical and reserved for only those
optimized systems with the fastest busses and hard drives, but I think my
numbers are a tad low.
Your numbers didn't measure the network, but rather the slowest link in
the chain, which was likely the write capability of the drive receiving
the copy of the file.
What speeds can we expect? What is slowing down this new network?
There may be nothing slowing down the network. Do a network throughput
test using a piece of software designed for doing that, that
sends/receives data (usually memory<->memory with no disk involved
directly) instead. Ideally, you should be able to get 125MB/s in
either direction, and quite close to double that when testing
bidirectionally.
--
Randy Howard (2reply remove FOOBAR)
"The power of accurate observation is called cynicism by those
who have not got it." - George Bernard Shaw
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