Hi all,

At the moment we are running Debian squeeze with stock samba 3.5.6. and are testing some new samba installations from ubuntu 12.04, centos 6.4 and debian wheezy. All running in a VM on a XenServer. The samba servers are member of a 2008R2 domain, using smb1 protocol all are running fine and we get a constant 90MB/s (big file transfer) on our 1GB network. We would like to enable smb2 protocol for performance reasons, but when we do enable SMB2 (max protocol = SMB2) file transfer speed drops to 50-60MB/s (one big file) instead of the 80-90MB/s we used to get before. We noticed when this happens the cpu is at its max instead of 60-70% when using smb1. iostat doesn't show any serious load and our raid 10 setup isn't experience any difficulties.
Using the packages (3.6.13) from EnterpriseSamba we get simular results.

Is it known enabling smb2 requires a faster cpu and our cpu is simply not powerfull enough or is there another problem which we should look into? (Or should we just stick to smb1, because smb2 isn't worth the trouble?)

Some hardware specs:
IBM 3650 M3 - Xeon 2.13Ghz 4 cores (2 cores per VM)
4GB RAM (per VM)
Smartraid 5015 + bbu (4 sas disks / raid10)
1 GB network.

HP Z400 workstation + Windows 7

mount options:
/dev/mapper/vg-logical_volume on /data type ext4 (rw,nodiratime,relatime,acl,data=ordered,barrier=0,grpquota,errors=remount-ro)

        workgroup = OURDOMAIN
        realm = OURDOMAIN.EU
        server string = %h server
        security = ADS
        log file = /var/log/samba/log.%m
        max log size = 1000
        max protocol = SMB2
        client signing = required
        server signing = required
        load printers = No
        winbind separator = +
        winbind enum users = Yes
        winbind enum groups = Yes
        winbind use default domain = Yes
        idmap config OURDOMAIN:range = 20000 - 49999
        idmap config OURDOMAIN:backend = rid
        idmap config * : range = 2000-2999
        idmap config * : backend = tdb
        hide unreadable = Yes

        path = /data/data1
        read only = No
        inherit permissions = Yes
        inherit acls = Yes


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