try to change slot
perhaps one of your nic is sharing irq with mouse usb ide
etc so change slot
check with more /proc/interrupts
On Tue, 12 Feb 2002, Martin Josefsson wrote:
> Hi Alan,
>
> I have some small questions...
>
> Have you ever tried a motherboard with i820 chipset and two NIC's?
> I have a Asus P3C-D here (dual pIII 800 with 256MB rimm) and a D-Link
> DFE570-TX NIC (quad DECchip 21143 behind a DECchip 21152 pci bridge).
>
> The problem I'm seeing is extremely crappy pci performance.
> With one of the NIC's active I see no real problems but when two NIC's are
> active at the same time all hell breaks loose :(
>
> if I generate traffic out via 2 NIC's at the same time I'd expect to get
> about 2 x 100Mbit/s but in reality I get 2 x 25Mbit/s with this
> motherboard. and with 3 NIC's active I get about 3 x 15-20Mbit/s.
>
> I tried replacing the motherboard with an old SMP board based on the 440bx
> chipset (cpus underclocked to 600MHz) and then I can easily get 3 x
> 100Mbit/s with 25-30% cpu used in the machine.
>
> So my question is, have you ever seen such pci issues? I've tried all
> BIOS settings I could find and a lot of diffrent kernels. I've also tried
> the vanilla tulip-driver and the NAPI'fied one (which I have been helping
> to test) and both show the exact same performanceproblems.
>
> I tried routing a lot of packets and it started dropping a lot of packets
> when the cpu was only 75% used according to both vmstat and cyclesoak
> (with an UP kernel). A profile shows that default_idle gets about 25% of
> the time. I assume the kernel is waiting for the pci bus.
>
> And the last question, if you have the hardware, would you mind testing
> something similar on the Asus A7M266-D? We've been thinking of getting a
> few of these boards to replace the crappy i820 ones.
>
> I saw that you included a patch for MPS 1.4 in -pre9-ac1, was this the
> same patch you were talking about earlier and does it work?
>
> /Martin
>
> Never argue with an idiot. They drag you down to their level, then beat you with experience.
>
>
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