RE: Looking for the cause of poor I/O performance

Now I have network envy!  I am feeling inadequate.  :)

I guess I have some more XMAS ideas!  :)

I have about 7+ computers in my house and 2 network printers.
I currently have a 24 port 10/100BaseT switch.  A 5 port 100/1000BaseT
switch would be enough to make me happy.  I would connect up to 4 computers
to Gigabit, and connect the Gigabit switch to the 100BaseT switch.  Sweet!
I guess I better get a full time job!

Guy

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of David Greaves
Sent: Friday, December 03, 2004 11:33 AM
To: Erik Mouw
Cc: TJ; linux-raid@vger.kernel.org
Subject: Re: Looking for the cause of poor I/O performance

I paid about £50 for a 5port gig switch
I have 3 e1000 cards (about £30 each) - they're relegated to doorstops 
I'm afraid :(
Despite months of trying they just won't work with my consumer VIA/AMD 
systems (and Ganesh and gang have tried)
I'm now using even cheaper Marvell based SMC EZ1000s (£20ish) - I doubt 
I'll get close to the throughput the e1000s could achieve - but I get 3 
times more then fast ethernet (and about 10 times more than e1000s) 
which is worthwhile.

David

Erik Mouw wrote:

On Fri, Dec 03, 2004 at 06:30:51AM -0500, TJ wrote:
 

quoted

I'm cheap. I use a crossover so I didn't have to spring for the switch.

The 

quoted

NICs are Intel 82540EM's. I got them for around $55 per. I didn't think

that 

quoted

was too bad for gigabit. Of course, these controllers may be complete

trash, 

quoted

I dunno. 
   

You won't do any better than fast ethernet when you're using a
crossover cable. Gigabit ethernet doesn't need crossover cables for
direct connections, it uses all four wire pairs in cat5 cable and will
automatically figure out if there's a direct connection and do the
right thing (all mandatory by the gigE standard, so every NIC will
support it). If you use a fast ethernet cross cable, the NICs will
autonegotiate to 100 MB/s full-duplex.

The Intel gigE NICs are very good: good hardware, good driver, good
support. Gigabit ethernet switches are becoming rather cheap: 200 EUR
buys you an 8 port switch.


Erik

 

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