Dell 1600SC + 82540EM poor performance..HELP NEEDED

Stephane.Martin at imag.fr Stephane.Martin at imag.fr
Thu Jul 24 17:52:02 EDT 2003


Jim Phillips a écrit :
> 
> Hi,
> 
> The 82540EM is a low-cost 32-bit "desktop" NIC, so it's hard to get full
> gigabit bandwidth, particularly if you're running at 33 MHz (look at
> /proc/net/PRO_LAN_Adapters/eth0/PCI_Bus_Speed to find out).  There are no
> 82540EM-based PCI-X cards, AFAIK; are you sure it wasn't a 64-bit 82545EM
> card?  Intel distinguishes their 32-bit 33/66 MHz PCI PRO/1000 MT Desktop
> cards that use 82540EM from their 64-bit PCI-X PRO/1000 MT Server cards
> that use the 82545EM (and have full gigabit performance).
> 
> -Jim
> 
> On Thu, 24 Jul 2003 Stephane.Martin at imag.fr wrote:
> 
> > > > Hello,
> > > >
> > > > We have recently received 48 Bi-xeon Dell 1600SC and we are performing
> > > > some benchmarks to tests the cluster.
> > > > Unfortunately we have very bad perfomance with the internal gigabit
> > > > card (82540EM chipset). We have passed linux netperf test and we have
> > > > only 33 Mo
> > > >
> > > > between 2 machines. We have changed the drivers for the last ones,
> > > > installed procfgd and so on... Finally we had Win2000 installed and
> > > > the last driver
> > > >
> > > > from intel installed : the results are identical... To go further we
> > > > have installed a PCI-X 82540EM card and re-run the tests : in that way the
> > > >
> > > > results are much better : 66 Mo full duplex...
> > > > So the question is : is there a well known problem with this DELL
> > > > 1600SC concernig the 82540EM integration on the motherboard ????
> > > >
> > > > As anyone already have (heard about) this problem ?
> > > > Is there any solution ?
> > > >
> > > > thx for your help
> > > >
> > >
> > > --
> > > Dr. Jeff Layton
> > > Chart Monkey - Aerodynamics and CFD
> > > Lockheed-Martin Aeronautical Company - Marietta
> >
> > Hello,
> >
> > For our tests we are connected to a 4108GL (J4865A), we have done all necessary checks (maybe we've have forget something very very big ????) to
> > ensure the validity of our mesures. The ports have been tested with auto neg on, then off and also forced. We have also the same mesures when
> > connected to a J4898A. The negociation between the NIcs ans the two switches is working.
> >
> > When using a tyan motherboard with the 82540EM built-in and using the same benchs and switches ans the same procedures (drivers updates and
> > compilations from Intel, various benchs, different OS) the results are correct (80 to 90Mo).
> >
> > All our tests tends to show that dell missed something in the integration of the 82540EM in the 1600SC series...if not we'll really really appreciate
> > to know what we are missing there cause here we have a 150 000 dollars cluster said to be connected with a network gigabit having network perfs of
> > three 100 card bonded (in full duplex it's even worse !!!!!). If the problem is not rapidly solved the 48 machines will be returned....
> >
> > thx a lot for your concern,
> >
> > regards
> >
> >
> > --
> > Stephane Martin         Stephane.Martin at imag.fr
> > http://icluster.imag.fr
> > Tel: 04 76 61 20 31
> > Informatique et distribution Web:  http://www-id.imag.fr
> > ENSIMAG - Antenne de Montbonnot
> > ZIRST - 51, avenue Jean Kuntzmann
> > 38330 MONTBONNOT SAINT MARTIN
> > _______________________________________________
> > Beowulf mailing list, Beowulf at beowulf.org
> > To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
> >

I'm going to re re re re check it...

thx a lot for your concern !

-- 
Stephane Martin         Stephane.Martin at imag.fr
http://icluster.imag.fr 
Tel: 04 76 61 20 31   
Informatique et distribution Web:  http://www-id.imag.fr
ENSIMAG - Antenne de Montbonnot 
ZIRST - 51, avenue Jean Kuntzmann
38330 MONTBONNOT SAINT MARTIN
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