[Samba] Very slow samba performance on Centos 6

Volker Lendecke Volker.Lendecke at SerNet.DE
Thu Aug 4 09:01:42 MDT 2011

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.

With best regards,

Volker Lendecke

SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
phone: +49-551-370000-0, fax: +49-551-370000-9
AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen

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