Windows: Line-Based vs. Message Signaled-Based Interrupts. MSI tool.

that ok really thank your help
win 8.1 default is MS default

should I try change "MSISupported" 1 to 0x00000000 ?
My win10 SSD default msi mode is enable
that why I want to change it in win 8.1

Edit2:


I find it Standard SATA AHCI Controller is my old device

 

finally, I fix it.
I just delete MessageSignaledInterruptProperties
then boot safe mode and using MSI_util_v3 enable msi then disable
Thank your help mbk1969

 

Strange thing because you already wrote that you tried to delete that registry key. Also setting the value MSISupported to 0 should fix the issue as well.

 

yes, that is really weird.
normal mode bluescreen
boot safe mode working

 

@Risedo

You can install Intel RST drivers for Win8.1, and they should work in MSI mode by default.

https://www.win-raid.com/t2f23-Intel-RST-RSTe-Drivers-latest-v-WHQL-v.html

 

Hi, long time user, first time poster.
I've been using the tool you created ever since I knew about its existence. To be honest not because I can "feel": a difference but mainly because I'm "that type of guy"...
Anyway, Just finished updating some drivers and thought I'd have a look and see if by any chance there was an update to the tool (as I always do) and lo and behold, for the first time in many moons there was actually a new version.
Not sure what's the difference between versions (if any) but I did realize something:

- This is how v2 works on my system


(As you can see, I already checked every box to use it in MSI mode etc, never had a problem with anything)

- And this is how v3 looks like on the same system:

(There are MANY new options that I'm not even sure if I need or not)

Ok, my question is a twofold short and simple actually (unlike my post, LOL):
What's the RECOMMENDED setting for EVERYTHING (provided nothing causes a BSOD, and it doesn't) I'm assuming MSI? And should I change "interrupt priority" now that the tool gives me the option? If so. which ones and to what? High? Normal?, Low?
Thanks a bunch!

PS: My main interest is for competitive gaming... Thanks again for taking the time to update the tool and reply to (most) of the comments made in here.
You rock.

 

You are welcome.

MSI mode should work better, so yes turn MSI mode for everything (but only for devices that support it). Majority of gurus do not see much of improvement over the legacy mode, though.
As for interrupt priority we still do not know neither how exactly it applies nor whether it applies at all. Some gurus reported better mouse responsiveness after they set high priority for USB controller where mouse is connected.

 

First of all, respect to OP for still supporting a thread and helping people out even after nearly a decade.

I have a brief question.

I've been struggling with input lag / inconsistent frametime spikes in the game Overwatch for quite awhile. The game feels buttery smooth at times, and other times, not so much. I've been toying around with a lot of settings. As of today, I downloaded MSI Utility v2, and set my GPU to MSI mode, as well as set my priority to 'High' (which I believe is one of the more harmless settings to change).

My question is as follows: If I wanted to revert these two settings (MSI Mode, high priority) for my GPU (GTX 1080), would I simply need to launch the MSI Utility v2 and uncheck 'MSI' as well as set priority back to Undefined? Would that completely restore all settings that have been set by MSI Utility v2?

I just fear permanent damage done to my OS, or things like leftover registry keys with no way to revert everything except reinstalling Windows. I created a system restore point in case.

 

@finiteLimit

Interrupt priority setting can be reverted to original state by setting it to original state (as it was first time you look at it).
MSI checkbox can be reverted to original state only if corresponding registry value was present before you started to toy with it. If registry value is not present and user checks MSI checkbox then registry value is created - after that all clicks on the checkbox just change the value of the setting. And tool does not indicate whether MSI registry value is present or not - unchecked MSI checkbox is shown for both - present "0" value and absent value.

Permanent damage in the form of unbootable OS can come only if you check MSI checkbox for device needed for OS boot (like SATA controller) while device does not support MSI mode. And tool reports supported modes.

As for leftovers, one registry value in corresponding device registry key is hardly a problem.

 

After I upgraded to a much more modern system (B550 chipset) from my old one (P67, Sandy Bridge era) I checked how many devices were in MSI mode by default. Answer: all of them, except NVidia. SATA, USB, NIC, Audio, everything is in MSI mode by default, except the NVidia GPU and the NVidia HDMI audio devices.

Maybe NVidia should start getting with the times? The weird thing is that on Linux, NVidia is already using MSI mode by default. What on earth makes Windows special here that NVidia chooses to use legacy IRQs by default?

Edit: Oops, I'm an idiot. Audio (Realtek) is not in MSI mode. No idea how I misread that in the device manager.

 

@RealNC

Problem with SATA devices is they do not work in MSI mode with default Windows drivers in Win7 and Win8. Only Win10 has default SATA drivers which work in MSI mode.

I was thinking to modify tool to not show devices without MSI mode support or just refuse to save changes...

PS As for NV GPUs people reported new 3000 cards working in MSI mode by default.

 

Hrm, apparently Intel since Ivy Bridge has supported a IRQ feature called PAIR.

• Power Aware Interrupt Routing (PAIR): This feature is meant to improve Intel's core sleeping technology by making the CPU aware of which of its cores are asleep and which are awake. It can then send interrupt requests from peripherals or a software application to cores that are up and running, rather than waking a core that has been powered down to handle the interrupt.

I wonder if AMD has a similar feature.

 

On my system, windows is using MSI by default so it seems system dependent, the driver must be looking for "something" to decide whether its on or off by default.

 

I used to run my sata in MSI mode on windows 8.1, was off by default, but after I toggled didnt notice any issues, win 10 its MSI by default.

 

There is no such decision in the driver logic, Ampere is the first line to have the driver inf default to MSIs

 

And on Win7 you would get unbootable OS.

 

Probably, but I was reporting for win8 as I seen a comment saying it didnt work for it.

 

X2APIC architecture guide

 

The latest cards support it by default.

 

Can I safely disable MSI Mode on my M2 NVME which has the OS installed?

Sorry if this has been asked before, I couldn't find an answer.