On 15.04.2011 04:45, Bean wrote: > Hi, > > I believe this is caused by the read algorithm of grub2. If the file > is continuous, grub legacy will read it in one pass, while grub2 will > break it up into small blocks, this will slow it down dramatically. I > haven't tested efi, but in bios mode, sometimes it takes twice as long > for grub2 to read the same file. > That's why I asked which fs it is. On an FS like ext2 or fat Both GRUBs are limited by the need of rereading indirect blocks or FAT chain (sure this can be aleviated by buffering and merging the nodes but neither GRUB Legacy nor GRUB2 does it). Currently it makes difference only on extent-based filesystems like ext, xfs or btrfs. I don't want to embark on adding another code path in grub_disk_read before having enough info to confirm this theory yet neither the original reporter nor the others answered which FS they conducted experiments on.
-- Regards Vladimir 'φ-coder/phcoder' Serbinenko
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