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SB-E Marking TSC unstable due to check_tsc_sync_source failed [xpost Intel CPUs] - Page 3

post #21 of 38
I'll probably install Windoze 8, and write a program that reads the tsc's across all the cores
and show them that cpu 0's tsc is incorrect. Already did it for linux. Then they might fix it since it's Windoze.

my chip is a 3930k, btw.
Edited by Pagannini980 - 1/10/13 at 2:59pm
post #22 of 38
Thread Starter 
Quote:
Originally Posted by Pagannini980 View Post

I'll probably install Windoze 8, and write a program that reads the tsc's across all the cores
and show them that cpu 0's tsc is incorrect. Already did it for linux. Then they might fix it since it's Windoze.

my chip is a 3930k, btw.

Let me know if you need any help with this. I'm pretty disappointed that this happened in the first place. Pretty big bug if you ask me.
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post #23 of 38
Yeah, hackintosh as a kext patch that fixes this. Can't understand why linux doesn't adopt it.
Just set the tsc's upon boot... Simple...
post #24 of 38
Thread Starter 
Quote:
Originally Posted by Pagannini980 View Post

Yeah, hackintosh as a kext patch that fixes this. Can't understand why linux doesn't adopt it.
Just set the tsc's upon boot... Simple...

I saw this too.. VoodooTSCSync or something like that.

I'm going to look in to it more for a possible kernel patch.
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post #25 of 38
Yep thats it.
post #26 of 38
Quote:
Originally Posted by Pagannini980 View Post

Yeah, hackintosh as a kext patch that fixes this. Can't understand why linux doesn't adopt it.
Just set the tsc's upon boot... Simple...

cause there are other clock sources one can set the kernel to use, as tsc is nortorious on intel cpu's not to be "accurate". I once had my linux install refuse to boot up cause i changed from localtime to utc time, and it was the tsc not being in sync, disabled tsc on the kernel commandline with notsc, haven't had a problem since.

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post #27 of 38
Thread Starter 
Quote:
Originally Posted by Transhour View Post

cause there are other clock sources one can set the kernel to use, as tsc is nortorious on intel cpu's not to be "accurate". I once had my linux install refuse to boot up cause i changed from localtime to utc time, and it was the tsc not being in sync, disabled tsc on the kernel commandline with notsc, haven't had a problem since.

Intel guarentees when the BIOS loads the TSC then the clock will be in sync across all cores.

We should have the choice of which clock source to use, not be limited because of motherboard manufacturer issues.

Clearly ASUS botched something up when going from ROM to CAP. My Z77 board uses CAP and no issues with the latest BIOS... very frustrating to have to downgrade all the way to one of the first BIOS releases for the board.

TSC is extremely accurate once set.

From the Intel System Manual 16.12.1 (quoting someone from Stackoverflow)
Quote:
The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processors support for invariant TSC is indicated by CPUID.80000007H:EDX[8]. The invariant TSC will run at a constant rate in all ACPI P-, C-. and T-states. This is the architectural behavior moving forward.

Edited by KoSoVaR - 1/10/13 at 5:09pm
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post #28 of 38
Since nobody posted it, you should see if you are running multiple timers or just TSC.

cat /sys/devices/system/clocksource/clocksource0/available_clocksource

It'll tell you what the kernel has available. If it's using multiple timers, you could be running into an issue there.
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post #29 of 38
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Quote:
Originally Posted by mushroomboy View Post

Since nobody posted it, you should see if you are running multiple timers or just TSC.

cat /sys/devices/system/clocksource/clocksource0/available_clocksource

It'll tell you what the kernel has available. If it's using multiple timers, you could be running into an issue there.

tsc hpet acpi_pm jiffies

When I need it I specifically call tsc.. so no issues. The kernel is fine, I just needed tsc to actually be in sync and working.

Thanks!
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post #30 of 38
Quote:
Originally Posted by KoSoVaR View Post

tsc hpet acpi_pm jiffies

When I need it I specifically call tsc.. so no issues. The kernel is fine, I just needed tsc to actually be in sync and working.

Thanks!

From what I've gathered, you need to force these at boot or force it in a custom kernel. If you don't, the system is going to use the available timers. You have all 4, so it shouldn't be a surprise that your kernel probably isn't syncing specifically to TSC. So I'm guessing that's a start into why TSC isn't syncing equally.
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