diff options
| author | MAULIK V VAGHELA <maulik.v.vaghela@intel.com> | 2021-08-25 16:41:23 +0530 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-09-09 14:46:46 +0000 |
| commit | 84532dae1424e97909400c1e8da88c6909cfbaac (patch) | |
| tree | c0006386d089394ae9d522a04fb40f1618791391 | |
| parent | 1f88a71aa8dd950b62556bd421dcf5edf3c01f9a (diff) | |
soc/intel/alderlake: Change VBOOT_HASH_BLOCK_SIZE to 4 KiB
Default VBOOT_HASH_BLOCK_SIZE is 1 KiB and increasing it to 4 KiB
helps in improving overall boot time since it reduces hashing and
body loading time.
Increasing it over 4 KiB doesn't result in significant improvement,
thus keeping the value at 4 KiB as of now.
Timing data:
Note that before Data is with 1 KiB block size.
|------------------------------------------------------|
| Stage | Block Size | Before | After |
|finished loading body| 4 KiB | 205,187 | 189,947 |
|finished loading body| 8 KiB | 205,187 | 188,708 |
|finished loading body| 16 KiB | 205,187 | 188,085 |
|finished loading body| 32 KiB | 205,187 | 187,793 |
|------------------------------------------------------|
BUG=b:188577893
BRANCH=None
TEST=Boot time for Brya improves by 20 - 25 msec
Change-Id: I9222761c7d58e4a370d3a41c651b6c169599d792
Signed-off-by: MAULIK V VAGHELA <maulik.v.vaghela@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57141
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
| -rw-r--r-- | src/soc/intel/alderlake/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig index e2116c787e..cdf127f36d 100644 --- a/src/soc/intel/alderlake/Kconfig +++ b/src/soc/intel/alderlake/Kconfig @@ -260,6 +260,13 @@ config VBOOT select VBOOT_VBNV_CMOS_BACKUP_TO_FLASH select VBOOT_X86_SHA256_ACCELERATION +# Default hash block size is 1KiB. Increasing it to 4KiB to improve +# hashing time as well as read time. This helps in improving +# boot time for Alder Lake. +config VBOOT_HASH_BLOCK_SIZE + hex + default 0x1000 + config CBFS_SIZE default 0x200000 |