SMB2 performance is worse than SMB1 while iometer 512byte transfer

[Jeremy Allison]

On Fri, Sep 13, 2013 at 10:57:22PM +0800, Jones wrote:
> ========================
> With SMB2, there are 3 user-space items on the top of of kernel-space
> ia32_syscall.
> With SMB1, kernel-space ia32_syscall is on the top.
> 
> "perf top -p <smbd_pid>" SMB2 enabled shows: (samba-4.0.9)
>      7.66%  libtalloc.so.2.0.7   [.] talloc_chunk_from_ptr
>      4.02%  libtalloc.so.2.0.7   [.] __talloc
>      3.87%  libtalloc.so.2.0.7   [.] _talloc_free_internal

talloc_chunk_from_ptr should be inlined, so I'm assuming
inlined functions shouldn't show up on perf (I may be
wrong here :-).

How are you compiling smbd. Are you using -O<level> ?

Jeremy.