Re: Samba performance / zero-copy network I/O

[Alan Cox]

> When reading the profiler results, the largest consuming kernel (calls?)
> are file_read_actor and csum_partial_copy_generic, by a longshot (about
> 70% and 20% respectively).
> 
> Presumably, the csum_partial_copy_generic should be eliminated (or at
> least reduced) by David Miller's zerocopy patch, right?  Or am I
> misunderstanding this completely? :)

To an extent, providing you are using the samba sendfile() patches. SMB cant
make great use of zero copy file I/O due to the fact its not really designed
so much as mutated over time and isnt oriented for speed