Date: Fri, 18 Oct 2002 11:48:11 -0700 (PDT) From: Kelly Yancey <kbyanc@posi.net> To: Prafulla Deuskar <pdeuskar@FreeBSD.ORG> Cc: Luigi Rizzo <rizzo@icir.org>, Petri Helenius <pete@he.iki.fi>, Lars Eggert <larse@ISI.EDU>, <freebsd-net@FreeBSD.ORG> Subject: Re: ENOBUFS Message-ID: <20021018113427.Y1611-100000@gateway.posi.net> In-Reply-To: <20021018111147.A91108@hub.freebsd.org>
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On Fri, 18 Oct 2002, Prafulla Deuskar wrote:
> FYI. 82543 doesn't support PCI-X protocol.
> For PCI-X support use 82544, 82545 or 82546 based cards.
>
> -Prafulla
>
That is alright, we aren't expecting PCI-X speeds. It is just that our only
PCI slot on the motherboard (1U rack-mount system) is a PCI-X slot. Shouldn't
the 82543 still function normally but only as at PCI speeds?
Thanks,
Kelly
>
> Kelly Yancey [kbyanc@posi.net] wrote:
> > On Fri, 18 Oct 2002, Luigi Rizzo wrote:
> >
> > > On Fri, Oct 18, 2002 at 10:27:04AM -0700, Kelly Yancey wrote:
> > > ...
> > > > Hmm. Might that explain the abysmal performance of the em driver with
> > > > packets smaller than 333 bytes?
> > >
> > > what do you mean ? it works great for me. even on -current i
> > > can push out over 400kpps (64byte frames) on a 2.4GHz box.
> > >
> > > luigi
> > >
> >
> > Using a SmartBit to push traffic across a 1.8Ghz P4; 82543 chipset card
> > plugged into PCI-X bus:
> >
> > FrameSize TxFrames RxFrames LostFrames Lost (%)
> > 330 249984 129518 120466 48.19
> > 331 249144 127726 121418 48.73
> > 332 248472 140817 107655 43.33
> > 333 247800 247800 0 0
> >
> > It has no trouble handling frames 333 bytes or larger. But for any frame
> > 332 bytes or smaller we consistently see ~50% packet loss. This same machine
> > easily pushes ~100Mps with the very same frame sizes using a bge card rather
> > than em.
> >
> > I've gotten the same results with both em driver version 1.3.14 and 1.3.15
> > on both FreeBSD 4.5 and 4.7 (all 4 combinations, that is).
> >
> > Kelly
> >
> > --
> > Kelly Yancey -- kbyanc@{posi.net,FreeBSD.org}
> > FreeBSD, The Power To Serve: http://www.freebsd.org/
> >
> >
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--
Kelly Yancey -- kbyanc@{posi.net,FreeBSD.org}
"No nation is permitted to live in ignorance with impunity."
-- Thomas Jefferson, 1821.
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