Re: [PATCH 2/9] sector_t format string

[Roman Zippel <zippel@linux-m68k.org>]

Hi,

On Thu, 10 Aug 2006, Andrew Morton wrote:

> For ext3 on x86:
> 
> CONFIG_LBD=y:
> 
> box:/usr/src/25> size fs/jbd/jbd.o fs/ext3/ext3.o
>    text    data     bss     dec     hex filename
>   51076       8      32   51116    c7ac fs/jbd/jbd.o
>   87466    1020       4   88490   159aa fs/ext3/ext3.o
> 
> CONFIG_LBD=n:
> 
> box:/usr/src/25> size fs/jbd/jbd.o fs/ext3/ext3.o
>    text    data     bss     dec     hex filename
>   51133       8      32   51173    c7e5 fs/jbd/jbd.o
>   87679    1020       4   88703   15a7f fs/ext3/ext3.o
> 
> That's a grand total of 270 bytes of text saved.  aka 0.19%.
> 
> We'll save four bytes in the inode (unlikely to save anything due to slab
> packing).

sector_t is used in multiple structures (bio/request/buffer_head), which 
quickly adds up.
ext3 is also currently not a very heavy sector_t user, if you try this 
with block/ you get a more than 3% difference.

bye, Roman
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