[vfio-users] [FEEDBACK NEEDED] Additionnal tips to include in the Arch wiki article

[Nicolas Roy-Renaud]

On 2016-05-09 13:13, Okky Hendriansyah wrote:

> Hi Nicolas,
>
> Appreciate your work on this.
I appreciate all the help I can get. :) Besides, the wiki article was in 
dire need of rewriting, alongside the fact that it looked like the go-to 
source of information for newcomers.
> 1.) Avoid transparent hugepages and enable explicit hugepages 
> (hugepages size variance 2 MB, 1 GB)
That one is definitely next on my list; I'm still reading the Redhat doc 
<https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Tuning_and_Optimization_Guide/sect-Virtualization_Tuning_Optimization_Guide-Memory-Tuning.html#sect-Virtualization_Tuning_Optimization_Guide-Memory-Huge_Pages> 
on that topic and trying to figure out what reccomendations I should make.
> 2.) Kernel configuration to improve performance like 1000 Hz clock 
> resolution, Voluntary Preemptible Kernel, halt_poll_ns
I've seen halt_poll_ns mentionned a few times but that's all I know. If 
you could elaborate on those, I wouldn't mind including them.
> 3.) How to passthrough host primary GPU (if possible, :) )
I've stuggled with that issue myself a lot until I gave up and ended up 
switching my guest GPU to a secondary slot. I'm still not even sure what 
counts as "host primary", is it the boot_vga?
> 4.) CPU family that should be use if you want to avoid ACS patches [1]
I'll probably mention that when I get around writing an actual section 
on the ACS override patch, but thanks for reminding me.
> 5.) APIC-V vs Hyper-V VAPIC on recent Intel CPU
I had already started to look into this, and from what I've managed to 
find, APIC-V is another one of those technologies found in higher-end E5 
Intel CPUs, alongside NUMA nodes allocation and actual ACS isolation. 
Considering how few people it would affect, I think it would be best 
left to another page dedicated to KVM or something, unless there's 
another way APIC can be optimized (I remember reading something about 
forcing Windows to use x2APIC).
> 6.) Issues on upgrading Windows 10, which is similar to your core2duo 
> workaround [2][3]
Ah, thank you! I was trying to find who else said something about the 
core2duo CPU model solving some compatibility issues with Windows. I'll 
include those when I get time.

- Nicolas
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