Re: [Samba] Samba performance issue

[ales-76 at seznam.cz]

Hi Fabien,

I haven't tried FUSE, and to be honest I will not. I doubt that the performace will even match cifs or smbfs implementation. I would say that file systems in user space are good for development or special applications, not for general purpose. Anyway I you are to try it out please let me know what you find.

Thank you

Ales


> ------------ Původní zpráva ------------
> Od: Fabien <azertyzero at free.fr>
> Předmět: Re: [Samba] Samba performance issue
> Datum: 11.1.2009 00:29:18
> ----------------------------------------
> Hello,
> 
> as you say, I also think it would be nice to mention the issue in the 
> documentation to avoid people turning crazy !
> 
> If you need the filesystem to be mounted, did you try the fuse 
> implementations ?
> 
> I found two : "SMB for Fuse" and "usmb". I haven't had time to try this 
> out yet.
> 
> Regards,
> 
> 
> Fabien
> 
> 
> ales-76 at seznam.cz a écrit :
> > Hello,
> > 
> > I can confirm that. I've tried smbclient from Samba 3.3.0rc2. It is
> considerably faster than cifs kernel module (version 1.52 from Linux 2.6.25).
> The file system is exported via Samba 3.0.33. Reading 700MB file (residing in
> the buffer cache) from the server I get:
> > 
> > cifs.ko ~ 30MB/s
> > smbclient ~ 74MB/s
> > 
> > I needed to remove the NIC IRQ affinity to only one CPU as it got completely
> saturated at about 66MB/s (1GHz Pentium III). Still think that the machine would
> do more than 74MB/s, but it is much better than 30MB/s anyway. Unfortunately I
> need the share mounted as a regular file system, so I'm gonna stick with the
> kernel implementation. One day I will try using jumbo frames, but for the moment
> I'm stuck with 1500b frames. In regards to the question Fabien has raised - I
> think Steven French has the performance optimization in TODO section for the
> cifs module, but he only knows when he gets there. Haven't asked him though.
> Anyway thanks for the help.
> > 
> > Regards
> > 
> > Aleš 
> > 
> > P.S.: The performance problems of various SMB/CIFS clients should probably be
> mentioned in Samba docs, that would prevent people from asking the same
> questions over and over again. Might even force Steven to fix the cifs kernel
> module ;-)
> > 
> >> ------------ Původní zpráva ------------
> >> Od: Volker Lendecke <Volker.Lendecke at SerNet.DE>
> >> Předmět: Re: [Samba] Samba performance issue
> >> Datum: 05.1.2009 21:42:42
> >> ----------------------------------------
> >> On Mon, Jan 05, 2009 at 08:25:34PM +0100, Fabien wrote:
> >>> I've seen I'm not the only one impacted with this issue these times on 
> >>> the mailing list :)
> >>>
> >>> I did the following test (Debian packages) :
> >>>
> >>> Server & Client : samba 3.2.5
> >>> mount -t smbfs : ~35Mo/s
> >>> mount -t cifs : ~35Mo/s
> >>> smbclient : ~80Mo/s
> >>>
> >>> Server & Client : samba 3.0.24
> >>> mount -t smbfs : ~35Mo/s
> >>> mount -t cifs : ~35Mo/s
> >>> smbclient : ~60Mo/s
> >>>
> >>> This is the first time I try smbclient.
> >>>
> >>> There is a real big difference between mount and smbclient !
> >>>
> >>> And it seems to be better to use the 3.2.5 version which is ~ 20Mo/s 
> >>> better than the 3.0.24 version.
> >>>
> >>> Again, all of this was tested without using the disks (buffer cache).
> >>>
> >>> Do you know where does this difference comes from ?
> >> It's the latencies that kill performance. Given the
> >> request->response nature of the protocol with a limited
> >> request size (no matter how large you make them), you can
> >> only get a certain number of round trips per second.
> >> smbclient 3.2 and even more in upcoming 3.3 hides those
> >> latencies by issuing more than one request at the same time
> >> using the "Multiplex ID" field in the SMB header properly.
> >> Neither cifs nor smbfs do this.
> >>
> >> Volker
> >>
> >>
> >>
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> 
>