Date: Sun, 2 Mar 2008 04:52:51 -0800 (PST) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Erik Trulsson <ertr1013@student.uu.se> Cc: net@freebsd.org Subject: Re: FBSD 1GBit router? Message-ID: <644693.83415.qm@web63910.mail.re1.yahoo.com> In-Reply-To: <20080302021208.GA87031@owl.midgard.homeip.net>
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--- Erik Trulsson <ertr1013@student.uu.se> wrote:
> On Sat, Mar 01, 2008 at 04:39:57PM -0800, Barney
> Cordoba wrote:
> >
> > --- Erik Trulsson <ertr1013@student.uu.se> wrote:
> >
> > > On Sat, Mar 01, 2008 at 01:27:46PM -0800, Barney
> > > Cordoba wrote:
> > > >
> > > > --- Ingo Flaschberger <if@xip.at> wrote:
> > > >
> > > > > Dear Barney,
> > > > >
> > > > > > It seems absolutely ridiculous to buy such
> > > > > hardware
> > > > > > and not install a PCIx or 4x PCIe card for
> > > another
> > > > > > $100. or less. Saying a 1x is "fast
> enough" is
> > > > > like
> > > > > > saying a Celeron is "fast enough".
> > > > >
> > > > > The box is a small 1HE appliance and can
> boot
> > > from a
> > > > > CF-Card.
> > > > > I trust them more than a "al cheapo" pc.
> > > > > 1x axiomtek NA-820
> > > > > 1x P4 3Ghz cpu
> > > > > 1x 1gb ddr2
> > > > > ---
> > > > > 850eur without taxes.
> > > > >
> > > > > A good chipset, good cpu, good ram, good
> > > harddisk,
> > > > > god powersupply has
> > > > > same price.
> > > > > And don't forget that in exchanges you pay
> for
> > > each
> > > > > HE.
> > > > >
> > > > > And back to 1x is not fast enough:
> > > > > There are no 1gbit single port network cards
> > > that
> > > > > support more than 1
> > > > > lane, even if you plug it into a 16 lane
> slot.
> > > > > (and I'm not talking about 10gbit cards; if
> you
> > > have
> > > > > 10gbit upstream you
> > > > > have enough $$ to buy good gear)
> > > >
> > > > Ok, well I've never seen a router with 1 port.
> I
> > > > thought we were talking about building a
> router?
> > >
> > > He did not say anything about a single port
> router.
> > > He talked about single port network cards. You
> can
> > > use more than one of them when building a
> router.
> >
> > His argument is that there are only 1x PCIe cards
> that
> > have 1 port. Since he needs 2 ports, and there are
> 2
> > port
> > PCIe cards, then his argument makes no sense. But
> the
> > point is that PCIe NICs are implemented with 1
> port
> > per lane in the chip. So a 2 port card will use 2
> > lanes
>
> No, the argument was that all 1-port PCI-E cards are
> only
> x1, ergo a x1 card must be fast enough for 1 port,
> else there
> would be 1-port cards manufactured that used more
> than
> one lane.
>
PCIe cards are 1x because the chips are all wired for
1x. Intel has a marketing plan. Its not to use low-end
chips for high-end operations. Intel is just going to
cannibalized their own business by putting out higher
performance low-end chips.
>
>
> >
> > >
> > > >
> > > > The lack of PCIe cards is a good reason to
> > > consider a
> > > > PCIX machine.
> > >
> > > What lack of PCI-E cards? These days there are
> > > quite a
> > > few to choose between.
> >
> > Yes, but they are all 1x, while there are many 1
> and 2
> > port PCIx cards which are twice as fast.
>
> There are dual- and quad-port PCI-E cards available
> too, and they are
> generally x4 lane models.
>
> Today there really is very little reason to use
> PCI-X instead
> of PCI-E when one is putting together a brand new
> system.
the "reason" is that its faster, but its clear that
you have no
interest in understanding that, so I'll give up on
trying to educated you.
The math is clearly over your head.
Barney
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