Re: [ANN] Squashfs 3.0 released

[Phillip Lougher]

Al Viro wrote:

> On Tue, Mar 21, 2006 at 04:01:51PM +0000, Phillip Lougher wrote:
>  
>
> > Perhaps, but almost all the byteswap is performed on the metadata side, 
> > reading directories and inodes, where nearly every byte will need to be 
> > swapped.  As inodes are compacted and compressed in 8 KB blocks, and are 
> > on average 15 bytes in size, for each 8 KB decompress you're potentially 
> > doing 8192/15 inode byteswaps.  This is probably sufficent to affect 
> > directory search and lookup on a slow processor.
> >    
>
> Oh, please...  Conversion from known endianness to host-endian is considerably
> faster than checking flag + branch + two variants, not to mention being
> smaller.
>  
It's one flag check, and one set of swap code actually.  The point that 
was being made is it is better to avoid byte swapping if possible.


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