[Samba] samba 3 - smb2 cpu usage
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) smb.conf: [global] 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 = 2 - 4 idmap config OURDOMAIN:backend = rid idmap config * : range = 2000-2999 idmap config * : backend = tdb hide unreadable = Yes [data1] path = /data/data1 read only = No inherit permissions = Yes inherit acls = Yes Thanks, Danny -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] samba 3 - smb2 cpu usage
On Mon, May 13, 2013 at 12:52:56PM +0200, Danny wrote: 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?) You should definitely use SMB2. The higher CPU is suprising. You should be able to max out a 1GB network with SMB2 easily. Does Debian support the perf utility to find out what the process does? Volker -- SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen phone: +49-551-37-0, fax: +49-551-37-9 AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen http://www.sernet.de, mailto:kont...@sernet.de -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
Re: [Samba] samba 3 - smb2 cpu usage
Op 13-5-2013 14:57, Volker Lendecke schreef: On Mon, May 13, 2013 at 12:52:56PM +0200, Danny wrote: 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?) You should definitely use SMB2. The higher CPU is suprising. You should be able to max out a 1GB network with SMB2 easily. Does Debian support the perf utility to find out what the process does? Volker Thanks for replying. 'perf top' smb2 enabled shows: Events: 33K cycles 53.07% [kernel][k] hypercall_page 36.33% smbd[.] SHA256_Update 1.99% [kernel][k] copy_user_generic_string 1.23% libc-2.13.so[.] 0x793e1 1.10% [xen_netfront] [k] xennet_poll /cut 'perf top' smb2 disabled shows: Events: 16K cycles 72.59% [kernel][k] hypercall_page 12.04% smbd[.] 0x40a5ee 1.86% [kernel][k] copy_user_generic_string 1.37% [xen_netfront] [k] xennet_poll 0.56% libc-2.13.so[.] 0x89283 0.35% [kernel][k] xen_restore_fl_direct 0.35% [kernel][k] pvclock_clocksource_read Looking at the above, disabling client and server signing gives me (in a quick test) back my performance. But now I'm prone to man in middle attacks? and if we run into other interoperabilities. (e.g. Windows clients/servers)? Danny -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
