Hi Jerome,
On Wed, 23 Nov 2022 at 19:57, Jerome Forissier jerome.forissier@linaro.org wrote:
Hi,
On 11/23/22 08:17, Masahisa Kojima wrote:
eficonfig command reads the all possible UEFI boot options from 0x0000 to 0xFFFF to construct the menu. This takes too much time in some environment, especially for the platform using OP-TEE and RPMB based secure storage. For example, on Socionext Developerbox, it takes more than 30 seconds to draw the boot option menu.
How are you configuring the RPMB FS driver in OP-TEE [1]? CFG_RPMB_FS_RD_ENTRIES and CFG_RPMB_FS_CACHE_ENTRIES affect how OP-TEE reads and caches the File Allocation Table from RPMB, they have an impact on the performance of file lookup. The default values are quite conservative in terms of memory, with no caching and a read buffer capable of holding entries for 8 files only. This can result is poor performance but was considered a reasonable default considering memory-constrained platforms.
Since Developerbox has lots of RAM, I suggest experimenting with larger values. For the initial file enumeration, I think increasing CFG_RPMB_FS_RD_ENTRIES should be enough to improve the situation quite a bit. Subsequent enumerations and access to the file contents could be improved by also increasing CFG_RPMB_FS_CACHE_ENTRIES. I would recommend setting both to the same "rather large" value (128?). You might need to increase the TEE core heap size though (CFG_CORE_HEAP_SIZE).
Then it would be nice to have these values defined as platform defaults upstream rather than in some downstream fork of OP-TEE (I am saying this because I suppose you already have custom values as part of some Yocto build or something).
Yes, I'm using default configuration. Thank you for the information to improve the performance. The problem I'm facing will be addressed by Heinrich's comment(using GetNextVariableName()), but OP-TEE configuration is worth trying.
Thanks, Masahisa Kojima
[1] https://github.com/OP-TEE/optee_os/blob/master/mk/config.mk#L170-L201
Thanks,
Jerome