diff options
| author | Sridhar Siricilla <sridhar.siricilla@intel.com> | 2023-01-19 18:50:09 +0530 |
|---|---|---|
| committer | Sridhar Siricilla <sridhar.siricilla@intel.com> | 2023-04-07 09:59:52 +0000 |
| commit | 7301cfac601d16460a7b592f011493de3f0c6d9d (patch) | |
| tree | f84a96c34dc28593ebaf02818d916330687aba01 /payloads/coreinfo/cpuinfo_module.c | |
| parent | c49efa365e1e1f07db8f208f4a63f27ca81e290d (diff) | |
soc/intel/common: Order the different types of cores based on APIC IDs
Currently coreboot presents the BSP core first, then efficient cores and
Performance cores as indicated below:
```
/sys/devices/system/cpu/cpu0/topology/thread_siblings_list:0-1
/sys/devices/system/cpu/cpu4/topology/thread_siblings_list:4
/sys/devices/system/cpu/cpu5/topology/thread_siblings_list:5
/sys/devices/system/cpu/cpu6/topology/thread_siblings_list:6
/sys/devices/system/cpu/cpu7/topology/thread_siblings_list:7
/sys/devices/system/cpu/cpu1/topology/thread_siblings_list:0-1
/sys/devices/system/cpu/cpu2/topology/thread_siblings_list:2-3
/sys/devices/system/cpu/cpu3/topology/thread_siblings_list:2-3
```
Existing code presents mix of different cores to OS and causes CPU load
balancing and power/performance impact. So, the patch fixes this
disorder by ordering the Performance cores first, compute die efficient
cores next, and finally SOC efficient cores if they are present. This
is done to run the media applications in a power efficient manner,
please refer the ChromeOS patches for details:
https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3963893
BUG=b:262886449
TEST=Verified the code on Rex system
After the fix:
```
/sys/devices/system/cpu/cpu0/topology/thread_siblings_list:0-1
/sys/devices/system/cpu/cpu1/topology/thread_siblings_list:0-1
/sys/devices/system/cpu/cpu2/topology/thread_siblings_list:2-3
/sys/devices/system/cpu/cpu3/topology/thread_siblings_list:2-3
/sys/devices/system/cpu/cpu4/topology/thread_siblings_list:4
/sys/devices/system/cpu/cpu5/topology/thread_siblings_list:5
/sys/devices/system/cpu/cpu6/topology/thread_siblings_list:6
/sys/devices/system/cpu/cpu7/topology/thread_siblings_list:7
```
Change-Id: I21487a5eb0439ea0cb5976787d1769ee94777469
Signed-off-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72132
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jan Samek <jan.samek@siemens.com>
Reviewed-by: Sukumar Ghorai <sukumar.ghorai@intel.com>
Reviewed-by: Ronak Kanabar <ronak.kanabar@intel.com>
Diffstat (limited to 'payloads/coreinfo/cpuinfo_module.c')
0 files changed, 0 insertions, 0 deletions