Re: IOMMU groups: better with Intel root ports, or with PEX8606 switch?

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On Sat, 2013-12-28 at 18:31 -0800, Dana Goyette wrote:
> I have purchased both a SuperMicro X10SAE and an X10SAT, and I need to 
> soon decide which one to keep.
> 
> The SuperMicro X10SAT has all the PCIe x1 slots hidden behind a PLX 
> PEX8066 switch, which claims to support ACS.  I'd expect the devices 
> downstream of the PLX switch to be in separate groups.
> 
> With Linux 3.13-rc5 and "enable overrides for missing ACS capabilities" 
> applied and set for the Intel root ports, the devices behind the switch 
> remain stuck in the same group.
> 
> In terms of passing devices to different VMs, which is better: all 
> devices on different root ports, or all devices behind the one 
> ACS-supporting switch?

Can you provide lspci -vvv info?  If you're getting that for groups
either the switch has ACS capabilities, but doesn't support the features
we need or we're doing something wrong.  Thanks,

Alex

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