LinuxQuestions.org - Nvidia SLI

- Linux - Hardware (https://www.linuxquestions.org/questions/linux-hardware-18/)

- - Nvidia SLI (https://www.linuxquestions.org/questions/linux-hardware-18/nvidia-sli-550061/)

When you have sli gpu's, and nvidia detects both fine, do you have to set any configs to enable SLI driver-side? bios side its all setup, just want to make sure im taking advantage of sli.

cool thanks for link, but i think my kernel isnt detecting my pci bridge?
[kupo@localhost ~]$ /sbin/lspci | grep -i vga
04:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7800 GT] (rev a1)
05:00.0 VGA compatible controller: nVidia Corporation G70 [GeForce 7800 GT] (rev a1)

Code:

[kupo@localhost ~]$ /sbin/lspci -t

-[0000:00]-+-00.0

          +-01.0

          +-01.1

          +-02.0

          +-02.1

          +-04.0

          +-06.0

          +-07.0

          +-08.0

          +-09.0-[0000:01]--+-08.0

          |                +-09.0

          |                +-0a.0

          |                \-0b.0

          +-0a.0

          +-0b.0-[0000:02]--

          +-0c.0-[0000:03]--

          +-0d.0-[0000:04]----00.0

          +-0e.0-[0000:05]----00.0

          +-18.0

          +-18.1

          +-18.2

          \-18.3

Code:

    *



      Identify both NVIDIA GPUs:



          % /sbin/lspci | grep -i vga



          0a:00.0 VGA compatible controller: nVidia Corporation [...]

          81:00.0 VGA compatible controller: nVidia Corporation [...]



    *



      Verify that each GPU is connected to a bus connected to the Root Bridge (note that the GPUs in the above example are on buses 0a and 81):



          % /sbin/lspci -t



      good:



          -+-[0000:80]-+-00.0

          |          +-01.0

          |          \-0e.0-[0000:81]----00.0

          ...

          \-[0000:00]-+-00.0

                      +-01.0

                      +-01.1

                      +-0e.0-[0000:0a]----00.0



      bad:



          -+-[0000:81]---00.0

          ...

          \-[0000:00]-+-00.0

                      +-01.0

                      +-01.1

                      +-0e.0-[0000:0a]----00.0



      Note that in the first example, bus 81 is connected to Root Bridge 80, but that in the second example there is no Root Bridge 80 and bus 81 is incorrectly connected at the base of the device tree. In the bad case, the only solution is to upgrade your kernel to one that properly detects your PCI bus layout.

Try including the option SLI with AFR as the value. Read through X Config Options on nVidia's site. This is as far I can go.

I have a combo card that has a bridge chip.
$ /sbin/lspci -tv

Code:

-[0000:00]-+-00.0  Intel Corporation 82850 850 (Tehama) Chipset Host Bridge (MCH)

          +-01.0-[0000:01]----00.0  nVidia Corporation NV36.1 [GeForce FX 5700 Ultra]

          +-1e.0-[0000:02-03]--+-01.0-[0000:03]--+-08.0  NEC Corporation USB

          |                    |                +-08.1  NEC Corporation USB

          |                    |                +-08.2  NEC Corporation USB 2.0

          |                    |                +-09.0  VIA Technologies, Inc. IEEE 1394 Host Controller

          |                    |                \-0a.0  Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit Ethernet

          |                    +-02.0  Philips Semiconductors SAA7133/SAA7135 Video Broadcast Decoder

          |                    +-03.0  Internext Compression Inc iTVC16 (CX23416) MPEG-2 Encoder

          |                    +-04.0  VIA Technologies Inc. VT1720/24 [Envy24PT/HT] PCI Multi-Channel Audio Controller

          |                    \-06.0  Triones Technologies, Inc. HPT366/368/370/370A/372/372N

          +-1f.0  Intel Corporation 82801BA ISA Bridge (LPC)

          +-1f.1  Intel Corporation 82801BA IDE U100

          +-1f.2  Intel Corporation 82801BA/BAM USB (Hub #1)

          +-1f.3  Intel Corporation 82801BA/BAM SMBus

          \-1f.4  Intel Corporation 82801BA/BAM USB (Hub #2)

The 0000:03 is a PCI-PCI bridge chip which handles USB 2.0, IEEE-1394, and 1 Gb NIC.