JFFS3 & performance

[Joakim Tjernlund]

> Joakim Tjernlund wrote:
> > 
> > 2) Consider another checksum algorithm. Crc32 is very expensive
> >    and JFFS2 suffered severely in the early days. Now that crc32 is
> >    very optimized that problem is less visible, but crc32 is still
> >    expensive. Maybe an Adler32 checksum is good enough or a crc16?
> 
> Does anyone have links to the profilling data that showed this?

I had long time ago. That was the reason I optimized the in kernel
crc32() function to its current status.

> 
> (Also, I wouldn't have thought crc16 on 32 bit archs would have any 
> significant performance benefits.  But since I don't know either the 
> crc16 or crc32 algorithms... *shrug*)

Well, benchmarking the crc32() and csum_partial() functions in the
kernel should give a clue.

 Jocke