[SOLVED] [split] Missing HPET clocksource option
#1
FYI, "hpet" is gone in Clocksource since FW 1.2.4.
 Go to solution Reply

#2
(23-May-2022, 12:44 AM)hkphantomgtr Wrote: FYI, "hpet" is gone in Clocksource since FW 1.2.4.
Do you mean you have HPET enabled in the BIOS, but can't find that setting in the kernel config any more?

I havn't touched that part of the code, but will check and confirm later today (or in the week)
Snakeoil Operating System - Music, your way!
Reply

#3
(24-May-2022, 07:51 AM)agent_kith Wrote:
(23-May-2022, 12:44 AM)hkphantomgtr Wrote: FYI, "hpet" is gone in Clocksource since FW 1.2.4.
Do you mean you have HPET enabled in the BIOS, but can't find that setting in the kernel config any more?

I havn't touched that part of the code, but will check and confirm later today (or in the week)

Yes, now I have my NUC.  In the CMOS there is an option to turn on/off "High Precision Event Timer".  Your help will be highly appreciated, again.  Big Grin
Reply

#4
(24-May-2022, 12:14 PM)hkphantomgtr Wrote: Yes, now I have my NUC.  In the CMOS there is an option to turn on/off "High Precision Event Timer".  Your help will be highly appreciated, again.  Big Grin
Can you run the following command, and tell me what it says? Also generate a diagnostics file and send it to the specified email so I can check the logs

Code:
cat /sys/devices/system/clocksource/clocksource0/available_clocksource
Snakeoil Operating System - Music, your way!
Reply

#5
(30-May-2022, 03:36 PM)agent_kith Wrote:
(24-May-2022, 12:14 PM)hkphantomgtr Wrote: Yes, now I have my NUC.  In the CMOS there is an option to turn on/off "High Precision Event Timer".  Your help will be highly appreciated, again.  Big Grin
Can you run the following command, and tell me what it says? Also generate a diagnostics file and send it to the specified email so I can check the logs
 
Code:
cat /sys/devices/system/clocksource/clocksource0/available_clocksource

tsc acpi_pm

And I've emailed the diagnostic file to the specific email a/c.  Please take your time.  Shy
Reply

#6
(30-May-2022, 10:47 PM)hkphantomgtr Wrote: tsc acpi_pm
So it looks like you only have the above two as your clock source. I believe TSC is pretty good as well, so that's worth a try

(30-May-2022, 10:47 PM)hkphantomgtr Wrote: And I've emailed the diagnostic file to the specific email a/c.  Please take your time.  Shy
See this in the system logs:
Code:
hpet: HPET dysfunctional in PC10. Force disabled.

Look in your ACPI or power saving and see if you can disable PC10 state, play around with CPU states and see if you can disable just that, failing that you might need to disable power saving entirely Doing so should get HPET back after a reboot. Let me know how it goes.
Snakeoil Operating System - Music, your way!
Reply

#7
(31-May-2022, 06:24 PM)agent_kith Wrote:
(30-May-2022, 10:47 PM)hkphantomgtr Wrote: tsc acpi_pm
So it looks like you only have the above two as your clock source. I believe TSC is pretty good as well, so that's worth a try
(30-May-2022, 10:47 PM)hkphantomgtr Wrote: And I've emailed the diagnostic file to the specific email a/c.  Please take your time.  Shy
See this in the system logs:
 
Code:
hpet: HPET dysfunctional in PC10. Force disabled.

Look in your ACPI or power saving and see if you can disable PC10 state, play around with CPU states and see if you can disable just that, failing that you might need to disable power saving entirely Doing so should get HPET back after a reboot. Let me know how it goes.

Thanks, AK!  You're right.  After disabling the power control setting (disabling "Dynamic Power Technology" , or mainly "OS ACPI C2 Report"), my HPET is back, at the expense of lower temperature, and the low latency value.  I really like the HPET sound as the sound is more vivid, with better focus, much better transition, more "on-beat", and denser texture.   In short, more holographic.Big Grin


Attached Files Thumbnail(s)
               
Reply

#8
(31-May-2022, 11:12 PM)hkphantomgtr Wrote:
(31-May-2022, 06:24 PM)agent_kith Wrote:
(30-May-2022, 10:47 PM)hkphantomgtr Wrote: tsc acpi_pm
So it looks like you only have the above two as your clock source. I believe TSC is pretty good as well, so that's worth a try
(30-May-2022, 10:47 PM)hkphantomgtr Wrote: And I've emailed the diagnostic file to the specific email a/c.  Please take your time.  Shy
See this in the system logs:
 
Code:
hpet: HPET dysfunctional in PC10. Force disabled.

Look in your ACPI or power saving and see if you can disable PC10 state, play around with CPU states and see if you can disable just that, failing that you might need to disable power saving entirely Doing so should get HPET back after a reboot. Let me know how it goes.

Thanks, AK!  You're right.  After disabling the power control setting (disabling "Dynamic Power Technology" , or mainly "OS ACPI C2 Report"), my HPET is back, at the expense of lower temperature, and the low latency value.  I really like the HPET sound as the sound is more vivid, with better focus, much better transition, more "on-beat", and denser texture.   In short, more holographic.Big Grin

To further my findings, with the same CMOS setting, after changing to "TSC" clocksource, the latency becomes as good as before.  huh.... so, with my new NUC, seems the CMOS setting doesn't affect the latency, but the choice of "clocksource".

And last night, in a second thought, it's quite strange to me that, even in the default CMOS setting, including HPET is enabled, the Snakeoil OS can't use HPET, or the system/hardware can't use HPET with the CMOS default power management setting...... so where is the problem?
Reply

#9
(01-Jun-2022, 11:46 PM)hkphantomgtr Wrote: To further my findings, with the same CMOS setting, after changing to "TSC" clocksource, the latency becomes as good as before.  huh.... so, with my new NUC, seems the CMOS setting doesn't affect the latency, but the choice of "clocksource".
On some motherboards, I honestly can't discern any notable difference between HPET and TSC. IIRC need to disable hyper-threading.

I believe one is the older technology, and less "accurate" under certain conditions, and the other is meant to be a replacement. If memory serves, HPET is meant to be a replacement for TSC (could be the other way round though Big Grin).

(01-Jun-2022, 11:46 PM)hkphantomgtr Wrote: And last night, in a second thought, it's quite strange to me that, even in the default CMOS setting, including HPET is enabled, the Snakeoil OS can't use HPET, or the system/hardware can't use HPET with the CMOS default power management setting...... so where is the problem?
HPET is disabled in the kernel. There's apparently some problems with HPET when in C10 mode (power saving mode), so the kernel disables the HPET timer (and falls back to TSC IIRC). So even though HPET is enabled in the system BIOS, the OS will refuse to use it.

If you're using custom kernels, power saving is disabled by default so HPET is always working. Using stock linux kernels, full suite of power saving is enabled hence you may get that missing HPET.
Snakeoil Operating System - Music, your way!
Reply

#10
(02-Jun-2022, 08:16 AM)agent_kith Wrote:
(01-Jun-2022, 11:46 PM)hkphantomgtr Wrote: To further my findings, with the same CMOS setting, after changing to "TSC" clocksource, the latency becomes as good as before.  huh.... so, with my new NUC, seems the CMOS setting doesn't affect the latency, but the choice of "clocksource".
On some motherboards, I honestly can't discern any notable difference between HPET and TSC. IIRC need to disable hyper-threading.

I believe one is the older technology, and less "accurate" under certain conditions, and the other is meant to be a replacement. If memory serves, HPET is meant to be a replacement for TSC (could be the other way round though Big Grin).
(01-Jun-2022, 11:46 PM)hkphantomgtr Wrote: And last night, in a second thought, it's quite strange to me that, even in the default CMOS setting, including HPET is enabled, the Snakeoil OS can't use HPET, or the system/hardware can't use HPET with the CMOS default power management setting...... so where is the problem?
HPET is disabled in the kernel. There's apparently some problems with HPET when in C10 mode (power saving mode), so the kernel disables the HPET timer (and falls back to TSC IIRC). So even though HPET is enabled in the system BIOS, the OS will refuse to use it.

If you're using custom kernels, power saving is disabled by default so HPET is always working. Using stock linux kernels, full suite of power saving is enabled hence you may get that missing HPET.


O... I c.  Thanks for your explanation.  Now I understand more.
BTW, I've already disabled hyper-threading.  Have a nice day!
[-] The following 1 user Likes hkphantomgtr's post:
  • agent_kith
Reply



Bookmarks

Possibly Related Threads…
Thread Author Replies Views Last Post
  [split] Cannot install Roon Bridge kees1000 3 758 27-May-2023, 07:27 PM
Last Post: pikachullk
  [SOLVED[split] Cannot update to RPi Snakeoil Firmware Gear Isolation U10 uglymusic 10 1,264 15-Feb-2023, 03:32 PM
Last Post: uglymusic
  [split] MPD v23 crashes after updating to Gear Isolation U10 sammywong 8 1,025 01-Jan-2023, 10:36 AM
Last Post: agent_kith
  [SOLVED[split] Cannot Activate Snakeoil in 1.2.x (Gear Isolation) hkphantomgtr 11 1,724 08-May-2022, 06:00 PM
Last Post: hkphantomgtr
  [split] Cannot start LMS+Squeezelite R2 in Snakeoil Gear Isolation U4 Gigipack 5 911 26-Mar-2022, 05:30 PM
Last Post: agent_kith



Users browsing this thread:
1 Guest(s)

[-]
Our Sponsors

[-]
Welcome
You have to register before you can post on our site.

Username/Email:


Password:





[-]
Latest Threads
ZimaBoard 2x NIC, 2x SATA, 2x USB, 1x PC...
Last Post: agent_kith
26-Mar-2024 12:04 PM
» Replies: 13
» Views: 612
LMS Upgrade ?
Last Post: uglymusic
15-Mar-2024 09:14 PM
» Replies: 7
» Views: 149
Squeezebox shutdown
Last Post: TripleX
13-Mar-2024 07:34 AM
» Replies: 4
» Views: 70
MP3 Not Playing
Last Post: Coacharnold
10-Mar-2024 10:25 AM
» Replies: 3
» Views: 52
Fail to install myMPD
Last Post: hkphantomgtr
03-Mar-2024 08:45 PM
» Replies: 9
» Views: 195
Intel HFI Driver Can "Save Tons Of CPU C...
Last Post: hkphantomgtr
28-Feb-2024 09:15 PM
» Replies: 0
» Views: 41
Announcing Snakeoil Measurements 1.3.0
Last Post: agent_kith
26-Feb-2024 10:02 PM
» Replies: 94
» Views: 4137
More Problems with Squeezelite in 1.3
Last Post: Coacharnold
17-Feb-2024 09:47 PM
» Replies: 2
» Views: 69
Snakeoil Music server & Snakeoil its own...
Last Post: Snoopy8
17-Feb-2024 11:20 AM
» Replies: 8
» Views: 365
RoonBridge (64 bit only)
Last Post: scrarfussi
15-Feb-2024 08:26 PM
» Replies: 3
» Views: 4124

[-]
SnakeoilOS Mission Statement

Our mission is to create a free to use computer OS that is easy to install, intuitive to operate and play music that will connect and engage with you emotionally.

SnakeoilOS gives you the freedom to spend more time on listening, enjoying and exploring music. Wasting time on computers is now a thing of the past! Everything is constantly evolving/improving. Please check back often for updates.

If you like this project, do show your support with a small token donation. All donations collected will be used to run this website, and for purchasing new equipment for the project.


Powered By MyBB, © 2002-2024. Theme © Melroy van den Berg.