[Samba] Very slow samba performance on Centos 6

[Volker Lendecke]

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

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