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#1 2017-10-11 12:12:16

Utini
Member
Registered: 2015-09-28
Posts: 452
Website

Is intel_iommu=off save if I dont do GPU passthrough?

Arch running on my HTPC/Seedbox/Homeserver/Backupserver with:

CPU + GPU: Intel G4600
16GB RAM
1x SSD + 1x 4TB WD Red

I wonder if forcing "intel_iommu=off" is save if I don't plan to do GPU passthrough?
Or does "intel_iommu=off" also affect other things on the system?

Thanks !


Setup 1: Thinkpad T14s G3, 14" FHD - R7 6850U - 32GB RAM - 2TB Solidigm P44 Pro NVME
Setup 2: Thinkpad X1E G1, 15.6" FHD - i7-8850H - 32GB RAM - NVIDIA GTX 1050Ti - 2x 1TB Samsung 970 Pro NVME
Accessories: Filco Majestouch TKL MX-Brown Mini Otaku, Benq XL2420T (144Hz), Lo(w)gitech G400, Puretrak Talent, Sennheiser HD800S + Meier Daccord FF + Meier Classic FF

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#2 2017-10-11 12:16:36

Slithery
Administrator
From: Norfolk, UK
Registered: 2013-12-01
Posts: 5,776

Re: Is intel_iommu=off save if I dont do GPU passthrough?

Did it used to affect you?

It always used to be off by default, Arch changed this to be on by default instead causing some recent issues. By manually setting it to off you are simply reverting to how it always used to work. If it didn't cause you any problems in the past then it won't do so now.

This change is being reverted in 4.13.5 which should be out of [testing] soon.


No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

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#3 2017-10-11 12:23:34

Utini
Member
Registered: 2015-09-28
Posts: 452
Website

Re: Is intel_iommu=off save if I dont do GPU passthrough?

slithery wrote:

Did it used to affect you?

It always used to be off by default, Arch changed this to be on by default instead causing some recent issues. By manually setting it to off you are simply reverting to how it always used to work. If it didn't cause you any problems in the past then it won't do so now.

This change is being reverted in 4.13.5 which should be out of [testing] soon.

Well its a new system (starting building + installing 1-2 weeks ago) and also with a completely new task: Run energy effecient 24/7. 

So I can't really say yet if "off" would give me any issues. Also maybe I won't notice if "off" would also turn off some energy saving option or so (I don't know tongue).


Setup 1: Thinkpad T14s G3, 14" FHD - R7 6850U - 32GB RAM - 2TB Solidigm P44 Pro NVME
Setup 2: Thinkpad X1E G1, 15.6" FHD - i7-8850H - 32GB RAM - NVIDIA GTX 1050Ti - 2x 1TB Samsung 970 Pro NVME
Accessories: Filco Majestouch TKL MX-Brown Mini Otaku, Benq XL2420T (144Hz), Lo(w)gitech G400, Puretrak Talent, Sennheiser HD800S + Meier Daccord FF + Meier Classic FF

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#4 2017-10-12 07:41:44

seiichiro0185
Member
From: Leipzig/Germany
Registered: 2009-04-09
Posts: 226
Website

Re: Is intel_iommu=off save if I dont do GPU passthrough?

You really only need the intel_iommu on if you want to do virtualisation and pass through PCI(e) devices to your VMs (e.G. GPU, Controllers, Network Cards etc..). If you don't plan to do this you shouldn't need it. AFAIK it also has nothing to do with energy saving options or similar, at least I don't see any difference in Battery runtime on my Laptop between setting it on or off.


My System: Dell XPS 13 | i7-7560U | 16GB RAM | 512GB SSD | FHD Screen | Arch Linux
My Workstation/Server: Supermicro X11SSZ-F | Xeon E3-1245 v6 | 64GB RAM | 1TB SSD Raid 1 + 6TB HDD ZFS Raid Z1 | Proxmox VE
My Stuff at Github: github
My Homepage: Seiichiros HP

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