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

Jim Phillips jim at ks.uiuc.edu
Fri Jul 25 10:47:40 EDT 2003


Hi again,

If the Dell has an 82540 on 33 MHz but the Tyan has it on 66 MHz, I would
expect the Tyan to have twice the performance, but still less than that of
a 64-bit 82545 at 66 MHz (or 133 MHz on PCI-X).

-Jim


On Fri, 25 Jul 2003 Stephane.Martin at imag.fr wrote:

> Matthew_Wygant at Dell.com a écrit :
> >
> > Desktop or server quality, I do not know, but the 1600sc does have the 82540
> > chip, dmseg should show that much.  It is on a 33MHz bus and does rate as a
> > 10/100/1000 nic.  I was curious which driver you were using, e1000 or
> > eepro1000?  The latter has known slow transfer problems, but just as
> > mentioned, hard-setting all network devices should yield the best
> > performance.  Hope that helps.  1600sc servers are not the best for clusters
> > with their size and power consumption, but I would recommend the 650 or
> > 1650s.
> >
> > -matt
> >
> > -----Original Message-----
> > From: Stephane.Martin at imag.fr [mailto:Stephane.Martin at imag.fr]
> > Sent: Thursday, July 24, 2003 4:52 PM
> > To: Jim Phillips
> > Cc: boewulf
> > Subject: Re: Dell 1600SC + 82540EM poor performance..HELP NEEDED
> >
> > 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
> > >
>
> The driver used is the e1000 one; last src from intel...
> We are on the way of a commercial issue to get "not on board" good gb NICs at low low cost...
> Which one is the best ? (broadcom ? intel ? other ?)
> I've check (by myself this time ;) the ID of the PCI card added : YOU ARE RIGHT it's 82545EM : our fault !!! good news !
> BUT, I've also re checked the number on the tyan motherboard and this this time it's really a 82540EM ! bad news !
> So the pb is still there : why on a tyan mb we get twice the perfs in comparaison with a dell mb ? (same os install, same bench, same network)
> BTW we are going to get a card on the 64 bit PCI-X bus as the onbaord is not suitable for high performance usage.
>

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