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MDEV-33488 Windows 11 misdetects mariadbd as LowQoS process, throttles CPU.

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The effect is reduced performance, at least on hybrid processor systems.

To fix, turn off throttling power explicitly at server startup.
This commit is contained in:
Vladislav Vaintroub 2024-02-19 14:30:46 +01:00
parent 53c6c823dc
commit 27b064d882
1 changed files with 20 additions and 0 deletions
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20
sql/winmain.cc
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@ -219,6 +219,25 @@ static const char *get_svc_name(const char *arg)
return arg ? arg : "MySQL";
}
/*
Disable CPU throttling for the process.
Windows 11 heuristics misdetects server as a background process and runs it
on "efficiency" cores, in hybrid architectures such as Alder Lake (12th
generation Intel Core).This results in serious performance degradation.
*/
void disable_cpu_throttling()
{
#ifdef PROCESS_POWER_THROTTLING_EXECUTION_SPEED
PROCESS_POWER_THROTTLING_STATE power_throttling{};
power_throttling.Version= PROCESS_POWER_THROTTLING_CURRENT_VERSION;
power_throttling.ControlMask= PROCESS_POWER_THROTTLING_EXECUTION_SPEED;
power_throttling.StateMask= 0;
SetProcessInformation(GetCurrentProcess(), ProcessPowerThrottling,
&power_throttling, sizeof(power_throttling));
#endif
}
/*
Main function on Windows.
Runs mysqld as normal process, or as a service.
@ -230,6 +249,7 @@ __declspec(dllexport) int mysqld_win_main(int argc, char **argv)
save_argv= argv;
save_argc= argc;
disable_cpu_throttling();
/*
If no special arguments are given, service name is nor present
run as normal program.