One interesting thing out of a thousand (Legacy IO Low Latency)

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Shade7
Posts: 222
Joined: 25 May 2022, 18:44

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Shade7 » 14 Jun 2022, 00:05

Sorry if this is a dumb question.

Where do I find this setting on an ASUS MOBO?

And what is it called? "Legacy IO"?

netarangi
Posts: 18
Joined: 09 Oct 2021, 21:07

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by netarangi » 14 Jun 2022, 00:26

Yeah wtf no context lol

I'm thinking grub
https://t.me/pump_upp

Slender
Posts: 573
Joined: 25 Jan 2020, 17:55

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Slender » 14 Jun 2022, 02:19

Shade7 wrote:
14 Jun 2022, 00:05
Sorry if this is a dumb question.

Where do I find this setting on an ASUS MOBO?

And what is it called? "Legacy IO"?
yes, u need to use grub to change this value, but need test, maybe this setting ruine aim

Shade7
Posts: 222
Joined: 25 May 2022, 18:44

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Shade7 » 14 Jun 2022, 16:18

Slender wrote:
14 Jun 2022, 02:19
Shade7 wrote:
14 Jun 2022, 00:05
Sorry if this is a dumb question.

Where do I find this setting on an ASUS MOBO?

And what is it called? "Legacy IO"?
yes, u need to use grub to change this value, but need test, maybe this setting ruine aim
Tried googling this setting, but couldn't come up with anything. Why/how did you look into this? Just because there is a different value? It is interesting if the default value is different between MOBO brands. I have only used ASUS MOBOs in my 2 PCs, and always wonder if my issues were related to ASUS (although I do like their BIOS navigation and quick updates).

Slender
Posts: 573
Joined: 25 Jan 2020, 17:55

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Slender » 15 Jun 2022, 01:53

Shade7 wrote:
14 Jun 2022, 16:18
Slender wrote:
14 Jun 2022, 02:19
Shade7 wrote:
14 Jun 2022, 00:05
Sorry if this is a dumb question.

Where do I find this setting on an ASUS MOBO?

And what is it called? "Legacy IO"?
yes, u need to use grub to change this value, but need test, maybe this setting ruine aim
Tried googling this setting, but couldn't come up with anything. Why/how did you look into this? Just because there is a different value? It is interesting if the default value is different between MOBO brands. I have only used ASUS MOBOs in my 2 PCs, and always wonder if my issues were related to ASUS (although I do like their BIOS navigation and quick updates).
nope, i found what my pci usb 2.0 controller work bad with new z690 chipset (but work good on z390), and i find this option to improve mousetester and dpc latency for my pci usb 2.0 controller.
Im love bios asus, but im feel same.
Maybe asus bad by default hidden parameters, maybe bad for all. For z690 msi, this parameter like asus (disabled). I will try z690 msi board later

Shade7
Posts: 222
Joined: 25 May 2022, 18:44

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Shade7 » 15 Jun 2022, 21:36

Slender wrote:
15 Jun 2022, 01:53
Shade7 wrote:
14 Jun 2022, 16:18
Slender wrote:
14 Jun 2022, 02:19
Shade7 wrote:
14 Jun 2022, 00:05
Sorry if this is a dumb question.

Where do I find this setting on an ASUS MOBO?

And what is it called? "Legacy IO"?
yes, u need to use grub to change this value, but need test, maybe this setting ruine aim
Tried googling this setting, but couldn't come up with anything. Why/how did you look into this? Just because there is a different value? It is interesting if the default value is different between MOBO brands. I have only used ASUS MOBOs in my 2 PCs, and always wonder if my issues were related to ASUS (although I do like their BIOS navigation and quick updates).
nope, i found what my pci usb 2.0 controller work bad with new z690 chipset (but work good on z390), and i find this option to improve mousetester and dpc latency for my pci usb 2.0 controller.
Im love bios asus, but im feel same.
Maybe asus bad by default hidden parameters, maybe bad for all. For z690 msi, this parameter like asus (disabled). I will try z690 msi board later
Could you provide instructions on how to change this setting on ASUS MOBO. I'm still a little confused.

Slender
Posts: 573
Joined: 25 Jan 2020, 17:55

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Slender » 16 Jun 2022, 05:13

Shade7 wrote:
15 Jun 2022, 21:36
Slender wrote:
15 Jun 2022, 01:53
Shade7 wrote:
14 Jun 2022, 16:18
Slender wrote:
14 Jun 2022, 02:19


yes, u need to use grub to change this value, but need test, maybe this setting ruine aim
Tried googling this setting, but couldn't come up with anything. Why/how did you look into this? Just because there is a different value? It is interesting if the default value is different between MOBO brands. I have only used ASUS MOBOs in my 2 PCs, and always wonder if my issues were related to ASUS (although I do like their BIOS navigation and quick updates).
nope, i found what my pci usb 2.0 controller work bad with new z690 chipset (but work good on z390), and i find this option to improve mousetester and dpc latency for my pci usb 2.0 controller.
Im love bios asus, but im feel same.
Maybe asus bad by default hidden parameters, maybe bad for all. For z690 msi, this parameter like asus (disabled). I will try z690 msi board later
Could you provide instructions on how to change this setting on ASUS MOBO. I'm still a little confused.
viewtopic.php?f=10&t=10136

kokkatc
Posts: 108
Joined: 23 Mar 2017, 13:49

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by kokkatc » 22 Jun 2022, 13:17

Slender wrote:
08 Jun 2022, 21:25
Today I learned one interesting dependency on one bios setting.
This setting is:
Legacy IO Low Latency | VarStore: PchSetup, VarOffset: 0x771, Size: 0x1
Disabled: 0x0 (default)
Enabled: 0x1
I dont know why, but it disabled on asus z690 mobo by def, but i know on msi it enable by def.
Test enable\disable:
Settings: useplatformtick yes + 0.5ms, fps_max 400.
I want to note that this is not the maximum fps, but the one on which the game "gets stuck".
upd: on msi board same (disabled)
Are you saying that on say an MSI Z690 board that <Legacy IO Low Latency> is enabled by default? This was one of the main settings I was interested in w/ BIOS modding.

Slender
Posts: 573
Joined: 25 Jan 2020, 17:55

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by Slender » 22 Jun 2022, 13:49

kokkatc wrote:
22 Jun 2022, 13:17
Slender wrote:
08 Jun 2022, 21:25
Today I learned one interesting dependency on one bios setting.
This setting is:
Legacy IO Low Latency | VarStore: PchSetup, VarOffset: 0x771, Size: 0x1
Disabled: 0x0 (default)
Enabled: 0x1
I dont know why, but it disabled on asus z690 mobo by def, but i know on msi it enable by def.
Test enable\disable:
Settings: useplatformtick yes + 0.5ms, fps_max 400.
I want to note that this is not the maximum fps, but the one on which the game "gets stuck".
upd: on msi board same (disabled)
Are you saying that on say an MSI Z690 board that <Legacy IO Low Latency> is enabled by default? This was one of the main settings I was interested in w/ BIOS modding.
my fold, it disable by default on all z690.
it helps if you use pci usb 2.0 controller.
more stable graphs on mousetester and lower dpc

MT_
Posts: 113
Joined: 17 Jan 2017, 15:39

Re: One interesting thing out of a thousand (Legacy IO Low Latency)

Post by MT_ » 02 Jul 2022, 08:21

The DPC tester you use is afaik not accurate on Windows 10+.

Also, you should investigate which legacy IO we're talking about.
LTSC 21H2 Post-install Script
https://github.com/Marctraider/LiveScript-LTSC-21H2

System: MSI Z390 MEG Ace - 2080 Super (300W mod) - 9900K 5GHz Fixed Core (De-lid) - 32GB DDR3-3733-CL18 - Xonar Essence STX II

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