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From: "Volker Lendecke" <[email protected]>
Sent: Thursday, August 04, 2011 11:01 AM
To: "vg_ us" <[email protected]>
Cc: <[email protected]>
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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