Re: Slow loading and GRUB work after commit 938c3760b

[Zhang Boyang]

Hi

On 2022/9/10 14:33, jim945 via Grub-devel wrote:
> Hi,
>
> I am compiling grubx64.efi with modulescpio exfat ext2 fat gzio iso9660 
> loopback lzopio newc normal ntfs part_gpt part_msdos probe read search 
> tar test configfile echo xzio squash4 sfs memdisk
>
> The prefix is stored in the sfs container.
>
> After applying patch 938c3760b, the boot time before the menu appears 
> reaches 15-20 minutes. The work is very slow.
>
> And in Qemu this problem does not appear.

I'm not sure if this can help, could you please test if swapping "case 
0:" and "case 1:" at this position can reduce the problem? 
"https://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/kern/mm.c?id=d9b4638c50b16d4722e66d334e2c1a674b4a45cc#n443";

It seems GRUB is likely to try freeing disk cache first before 
requesting new pages. Although I'm not sure, but I think swapping "case 
0:" and "case 1:" may fix this problem.


Best Regards,
Zhang Boyang