SMB2 performance is worse than SMB1 while iometer 512byte transfer

[Volker Lendecke]

On Sun, Sep 15, 2013 at 06:21:27AM +0800, Jones wrote:
> Hi Jeremy,
> 
> 2013/9/14 Jeremy Allison <jra at samba.org>
> >
> >
> > 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> ?
> >
> 
> You are right! It is my fault!
> There is no optimization level is specified when I compiling samba4,
> After re-run the configuration phase with CFLAGS="-O -g" and re-compiling,
> perf top does not show talloc_chunk_from_ptr anymore.
> 
> With samba-3.6, though -O is not specified in configuration phase,
> source3/Makefile could see this
> CFLAGS= -O -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS $(FLAGS)
> -D_SAMBA_BUILD_=3
> 
> With samba-4 series, it is likely -O should be explicit specified,
> now samba4 is deployed with python-style waf so cannot found the Makefile
> as expected.
> 
> Found following links but not get much hint to where add the optimize flags,
> is ./configure CFLAGS="-O" sufficient?

I always do

CFLAGS=-O ./configure

Just one question: Does -O3 make a difference?

Volker

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