-------------------------------------------------
From: "Robert Adkins II" <radk...@impelind.com>
Sent: Friday, August 05, 2011 10:10 AM
To: "'vg_ us'" <vg...@hotmail.com>; <volker.lende...@sernet.de>
Cc: <samba@lists.samba.org>
Subject: RE: [Samba] Very slow samba performance on Centos 6
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-boun...@lists.samba.org
[mailto:samba-boun...@lists.samba.org] On Behalf Of vg_ us
Sent: Thursday, August 04, 2011 2:12 PM
To: volker.lende...@sernet.de
Cc: samba@lists.samba.org
Subject: Re: [Samba] Very slow samba performance on Centos 6
--------------------------------------------------
From: "Volker Lendecke" <volker.lende...@sernet.de>
Sent: Thursday, August 04, 2011 11:01 AM
To: "vg_ us" <vg...@hotmail.com>
Cc: <samba@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
I did include Smbclient ramdisk-to-harddisk (that's reading from local
ramdisk filesystem and copying to samba share sitting atop of real hard
drive) test.
Cifsfs mount with real disk gives the same performance as included "cifsfs
mount ramdisk-to-ramdisk:"
- Vadim
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