Customizable fs.lst order

Customizable fs.lst order

[Seth Goldberg]

Hi,

   In thinking of optimizing the number of disk operations for various 
operating systems deploying grub, the order of filesystems came up as a simple 
way to reduce the amount of processing.  If, for example, GRUB2 is deployed on 
Solaris, and the main use-case is to boot Solaris, there there are really only 
2 filesystems involed -- either UFS (via the ufs1 module) or ZFS.  Currently, 
the fs.lst is sorted alphabetically, so those two filesystems would be the 
last to be probed, wasting time.  Besides hand-editing the filesystem order, 
are there any plans to include an override or setting for "preferred" 
filesystems in a particular GRUB2 deployment?

  --S

Re: Customizable fs.lst order

[Vladimir 'phcoder' Serbinenko]

Seth Goldberg wrote:
> Hi,
>
>   In thinking of optimizing the number of disk operations for various
> operating systems deploying grub, the order of filesystems came up as
> a simple way to reduce the amount of processing.  If, for example,
> GRUB2 is deployed on Solaris, and the main use-case is to boot
> Solaris, there there are really only 2 filesystems involed -- either
> UFS (via the ufs1 module) or ZFS.  Currently, the fs.lst is sorted
> alphabetically, so those two filesystems would be the last to be
> probed, wasting time.  Besides hand-editing the filesystem order, are
> there any plans to include an override or setting for "preferred"
> filesystems in a particular GRUB2 deployment?
>
fs module autoloading is used only for interractive commands and is last
resort on booting. In particular it isn't done if correct module is
already inserted. So just insmod <your fs> before accessing your
filesystem. Look at grub-mkconfig on how it's done

2009-08-23  Vladimir Serbinenko  <phcoder@gmail.com>

        * commands/search.c (search_fs): Try searching without autoload
first.
        * util/grub-mkconfig_lib.in (prepare_grub_to_access_device): Load
        filesystem module explicitly for faster booting.

>  --S
>
>
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-- 
Regards
Vladimir 'phcoder' Serbinenko
Personal git repository: http://repo.or.cz/w/grub2/phcoder.git