[vfio-users] vfio, xeon e3s, acs, & gpus -- oh my!

[globalgorrilla at fastmail.fm]

On 2 Apr 2017, at 0:10, Joshua Hoblitt wrote:

> I decided to go with an E6-1650 v4 / C612 based motherboard as I 
> wanted
> both ECC memory and a BMC.

I think something this is the best option for the moment.

Posted-interrupts are only on E5 v4 and Xeon-D.

It makes a big difference with network cards (and GPUs).

Does anyone know if AVIC or some other Ryzen feature provides for 
posted-interrupts?

> This required switching from U to RDIMMs,
> which I typically don't use in a desktop, but there is theoretically a
> small RAS improvement with RDIMMs.  The cost works out to ~$350 more
> than a E3 system at the same clock rates, and dropping from kaby lake 
> to
> broadwell.  However, it is a jump from 2-4 memory channels, additional
> DIMM slots, and 2 additional cores.
>
> -Josh
>
> --
> On 04/01/2017 10:44 PM, Joshua Lee wrote:
>> That's the total price, counting the motherboard, btw.
>>
>> On Sun, Apr 2, 2017 at 1:43 AM, Joshua Lee <joshua613 at gmail.com
>> <mailto:joshua613 at gmail.com>> wrote:
>>
>>     What do you mean by "iffy"? My $200 x99 board has seperate IOMMU
>>     groups per-device, and a i7 5820k/6800k or, if you want it
>>     cheaper, an E5-1620v3 or 1620v4, can do ACS and sane IOMMU groups
>>     with it for under $600 also, without needing to get a used
>>     processor...
>>
>>     On Fri, Mar 31, 2017 at 8:11 PM, Taiidan at gmx.com
>>     <mailto:Taiidan at gmx.com> <Taiidan at gmx.com
>>     <mailto:Taiidan at gmx.com>> wrote:
>>
>>         Intel's stuff is really iffy about ACS unless you buy one of
>>         the overpriced two thousand dollar processors, they use it 
>> for
>>         artificial market segmentation so that they can say the
>>         desktop processors and the E3 etc doesn't "support" sr-iov 
>> etc.
>>
>>         If you want to do this without spending lots of money I would
>>         go with a coreboot compatible G34 Opteron setup, I have a
>>         KGPE-D16 and it has ACS + IOMMU with interrupt remapping (and
>>         every device gets its own IOMMU group) - I play games in VM 
>> on it.
>>
>>         You can get the board for $400 and a used quality 16 core CPU
>>         for around $100, there is also a port of the OpenBMC network
>>         kvm in progress - which will make it the first blob free
>>         server board with feature equivalency to the proprietary 
>> stuff.
>>
>>         https://www.coreboot.org/Board:asus/kgpe-d16
>>         <https://www.coreboot.org/Board:asus/kgpe-d16>
>>
>>
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>>
>
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