[Samba] Increasing samba performance

[James Lamanna]

On 2/1/06, James Lamanna <jlamanna at gmail.com> wrote:
> On 2/1/06, Jeremy Allison <jra at samba.org> wrote:
> > On Wed, Feb 01, 2006 at 03:39:08PM -0500, William Jojo wrote:
> > >
> > > On my AIX box I'm showing (in truss) send_file() calls for files in shares
> > > with oplocks turned off and "use sendfile = yes".
> >
> > Yes you are correct and I'm an idiot :-). I was remembering the
> > original code I wrote which insisted on an oplocked file.
> >
> > However, looking at the source code I find...
> >
> > #if defined(WITH_SENDFILE)
> >         /*
> >          * We can only use sendfile on a non-chained packet
> >          * but we can use on a non-oplocked file. tridge proved this
> >          * on a train in Germany :-). JRA.
> >          */
> >
> > Never trust a developer, trust the source code :-).
>
> Do you guys have any other ideas for increasing performance?
> As I mentioned earlier, "use sendfile" didn't make a difference (and
> the default is 'yes' anyways on 3.0.14 apparently).

Another interesting datapoint...
I reran this file copy test with a 1GB file using smbclient (and not
rsync through an smbmount) and I received 9MB/s

So my conclusion is that the kernel VFS layer is introducing the latency.