[Samba] Very slow samba performance on Centos 6

[Volker Lendecke]

Hi, Jeff!

Something for you to reply to ... :-)

Volker

On Thu, Aug 04, 2011 at 02:11:35PM -0400, vg_ us wrote:
> --------------------------------------------------
> 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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