[Samba] Very slow samba performance on Centos 6

[Robert Adkins II]

Wouldn't it be better to rerun these tests, not from the Ramdisk, but from a
network connection to more closely resemble what the results will be when in
a production environment?

Doing such tests years back did show that FTP will typically be faster than
Samba, due to the difference in overhead costs. Samba isn't a service like
FTP, it has to negotiate SMB packets, interpret the requests/commands and
then communicate that to the system it is running on. I haven't played with
CIFS, but I imagine that it to would have a similar or potentially greater
overhead than Samba itself.

--

Regards,
Robert Adkins II

 

> -----Original Message-----
> From: samba-bounces at lists.samba.org 
> [mailto:samba-bounces at lists.samba.org] On Behalf Of vg_ us
> Sent: Thursday, August 04, 2011 2:12 PM
> To: Volker.Lendecke at SerNet.DE
> Cc: samba at lists.samba.org
> Subject: Re: [Samba] Very slow samba performance on Centos 6
> 
> --------------------------------------------------
> From: "Volker Lendecke" <Volker.Lendecke at SerNet.DE>
> Sent: Thursday, August 04, 2011 11:01 AM
> To: "vg_ us" <vg_us at hotmail.com>
> Cc: <samba at lists.samba.org>
> Subject: Re: [Samba] Very slow samba performance on Centos 6
> 
> > On Thu, Aug 04, 2011 at 10:49:50AM -0400, vg_ us wrote:
> >> I have 2 identical Dell r510 servers with 10gig card, 
> running centos
> >> 6 with samba-3.5.4-68.el6_0.2.x86_64.
> >> I setup 16G ramdisk samba share on both and ran cp from 
> local ramdisk 
> >> to samba ramdisk mount.
> >> If I cp 12 1-gig files, I get combined 100MB/s transfer 
> rate. Single 
> >> file cp maxes out at about 15MB/s.
> >> Ftp transfer give me over 300MB/s.
> >>
> >> Running with 9000 MTU. Most smb.conf is default. I even disabled 
> >> atime and tried ext2 and xfs on ramdisk.
> >>
> >> Any help will be greatly appreciated.
> >
> > What client application are you using? If it is a cifsfs 
> kernel mount, 
> > you might see such artifacts. Please retry with the smbclient(1) 
> > application. If that is also slow, we need to investigate further.
> >
> 
> I re-ran some of the tests with following result:
> 
> Ftp ramdisk-to-ramdisk:
> 13572 MB, 32.8 secs - 413.8 MB/s
> 
> Ftp ramdisk-to-hardisk:
> 13572 MB, 62.8 secs - 222.4 MB/s
> 
> Smbclient ramdisk-to-ramdisk:
> 13572 MB 40 secs - 339 MB/s
> 
> Smbclient ramdisk-to-harddisk:
> 13572 MB 64 secs - 212 MB/s
> 
> cifsfs mount ramdisk-to-ramdisk:
> 13572 MB 289.8 - 47MB/s
> 
> cifsfs mounts are really slow, so what happens when linux, 
> windows and mac clients map/mount the share? Are they gonna 
> be this slow? Any way to speed it up?
> 
> Thanks
> 
> - Vadim 
> 
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