Crossfire 2

Zaileion · 07-22-2015, 08:15 AM

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Im trying to Crossfire 2 radeon 7990's, essentially Quadfire. Instructions from http://forumubuntusoftware.info/view...php?f=7&t=2336 worked perfectly but only for Device 0,1

Im not sure if this is crossfiring both GPU's in the primary graphics card leaving the secondary graphics card not crossfired or, crossfiring the 1st GPU of each graphics card leaving the 2nd GPUs on both primary and secondary cards not crossfired.

I know the Crossfire cable is working, and the cards are properly seated in the PCI slots because in Windows(R) everything works.

Side Note: No usual output from this command:

Code:

$ glxinfo | grep direct-rendering 
$

Should say: direct-rendering: yes (or something like that)

Here are some commands i've used:

1.

Code:

$ aticonfig --lsch 

Multiple GPU chain for adapter 0, status: Crossfire is enabled 
  0. 05:00.0 AMD Radeon HD 7900 Series  
1. 06:00.0 AMD Radeon HD 7900 Series

Code:

$ aticonfig --list-adapters 
* 0. 05:00.0 AMD Radeon HD 7900 Series  
  1. 06:00.0 AMD Radeon HD 7900 Series  
  2. 09:00.0 AMD Radeon HD 7900 Series  
  3. 0a:00.0 AMD Radeon HD 7900 Series  

* - Default adapter

I can get Crossifre on all 4 GPU's by doing the following but after reboot I get the result in Code # 1.

If I:

2.

Code:

$ sudo aticonfig --adapter=all --cfa 
[sudo] password for zaileion: 
No layout section was found in the file: '/etc/X11/xorg.conf'. 
Please run 'aticonfig --initial' first or modify your configuration file manually and run aticonfig again. 
aticonfig: parsing the command-line failed.

So..

3.

Code:

$ sudo amdconfig --initial -f --adapter=all 
Uninitialised file found, configuring. 
Using /etc/X11/xorg.conf 
Saving back-up to /etc/X11/xorg.conf.original-1

** Notice: Saving back-up to /etc/X11/xorg.conf.original-1 above. I “rm” the backups after every few, otherwise it would be in the dozens... Ive been trying and trying..

Then I:

4.

Code:

$ sudo aticonfig --adapter=all --cfa 
Multiple GPU chain added 
Warning: X needs to be restarted before MGPU changes take effect.

And:

5.

Code:

$ sudo aticonfig --adapter=all --crossfire=on 
Crossfire chain(s) enabled 
CrossFire does not support on this platform 
Warning: X needs to be restarted before CrossFire changes take effect.

Result NO Restart:

Code:

$ aticonfig --lsch 

Multiple GPU chain for adapter 0, status: Crossfire is enabled 
  0. 05:00.0 AMD Radeon HD 7900 Series  
  1. 06:00.0 AMD Radeon HD 7900 Series  
  2. 09:00.0 AMD Radeon HD 7900 Series  
3. 0a:00.0 AMD Radeon HD 7900 Series

Notice 0,1 are 05:00.0, 06:00.0 & 2,3 are 09:00.0, 0a:00.0 Anyone know what that means?

And then there is this command I'm not sure what it means:

Code:

$ aticonfig --lscs
    Candidate Combination: 
    Master: 5:0:0 
    Slave: 6:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    CrossFire can work with P2P mapping through GART
    Dongle Capabilities: support PASSTHROUGH |INTERLINK_SW_AFR | INTERLINK_AUTO_AFR | INTERLINK_BLACKING | INTERLINK_SUPERAA 
    Candidate Combination: 
    Master: 5:0:0 
    Slave: 6:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    CrossFire can work with P2P mapping through GART
    Dongle Capabilities: support PASSTHROUGH |INTERLINK_SW_AFR | INTERLINK_AUTO_AFR | INTERLINK_BLACKING | INTERLINK_SUPERAA 
    Candidate Combination: 
    Master: 5:0:0 
    Slave: 6:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    CrossFire can work with P2P mapping through GART
    Dongle Capabilities: support PASSTHROUGH |INTERLINK_SW_AFR | INTERLINK_AUTO_AFR | INTERLINK_BLACKING | INTERLINK_SUPERAA 
    Candidate Combination: 
    Master: 5:0:0 
    Slave: 6:0:0 
    CrossFire is disabled on current device
    CrossFire Diagnostics:
    CrossFire can work with P2P mapping through GART
    Dongle Capabilities: support PASSTHROUGH |INTERLINK_SW_AFR | INTERLINK_AUTO_AFR | INTERLINK_BLACKING | INTERLINK_SUPERAA

If I restart I get the same thing as # 1. above

I've tried different combinations of “sudo aticonfig –adapter=all....” replacing “all” with “1,2” or “2,3” and finished the instructions with the corresponding adjustments to the commands thus having to “rm” the backups of the xorg.conf.

No matter what when I restart I get the result in Code # 1 after a restart.

Thank you for providing your time.

mostlyharmless · 07-22-2015, 11:00 AM

Only have two comments, not sure if they'll help:

The 05:00.0, 06:00.0, 09:00.0 and 0a:00.0 are PCI slot assignments. If you run lspci, you'll see that data as well.

The other comment is that, aside from these information messages, have you tried running any graphics tests to measure the graphics processing speed? Sometimes the diagnostic information is inconsistent, but the cards actually are working in crossfire. Might be worthwhile to fire up some sort of benchmark program with some of your different efforts.