Hi all, I'm trying to figure out why write performance to a cifs mount is so very very bad: # dd if=/dev/zero of=mount/test bs=256K count=10 10+0 records in 10+0 records out 2621440 bytes (2.6 MB) copied, 73.5463 seconds, 35.6 kB/s Ouch! Read performance is fine: # dd if=mount/test of=/dev/null bs=256K count=10 10+0 records in 10+0 records out 2621440 bytes (2.6 MB) copied, 0.0222379 seconds, 118 MB/s I can also hop on the Windows machine and use psftp to transfer a large file from the Linux box fairly quickly. One possible issue is that the Linux machine is a Xen hypervisor, and the Windows machine is actually a VM. I can mount the same Windows share on a Linux VM running on the same hypervisor and performance is fine (8.3 MB/s). The Windows box is running Windows Server 2008 R2. Here are specs for the problematic Xen hypervisor: # uname -r 2.6.32.12-0.7.1.xs1.4.90.530.170661xen # mount.cifs -V mount.cifs version: 1.12RH # yum list | grep samba samba.i386 3.0.33-3.39.el5_8 installed samba-client.i386 3.0.33-3.39.el5_8 installed samba-common.i386 3.0.33-3.39.el5_8 installed samba-swat.i386 3.0.33-3.39.el5_8 base samba3x.i386 3.6.6-0.129.el5 base samba3x-client.i386 3.6.6-0.129.el5 base samba3x-common.i386 3.6.6-0.129.el5 base samba3x-doc.i386 3.6.6-0.129.el5 base samba3x-domainjoin-gui.i386 3.6.6-0.129.el5 base samba3x-swat.i386 3.6.6-0.129.el5 base samba3x-winbind.i386 3.6.6-0.129.el5 base samba3x-winbind-devel.i386 3.6.6-0.129.el5 base sblim-cmpi-samba.i386 1:1.0-49.el5 base sblim-cmpi-samba-devel.i386 1:1.0-49.el5 base sblim-cmpi-samba-test.i386 1:1.0-49.el5 base system-config-samba.noarch 1.2.41-5.el5 base I just installed this version of samba-client with yum. For comparison, here's the Linux VM: # uname -r 2.6.32-279.9.1.el6.x86_64 # mount.cifs -V mount.cifs version: 4.8.1 # yum list | grep samba samba.x86_64 3.5.10-125.el6 @base samba-client.x86_64 3.5.10-125.el6 @base samba-common.x86_64 3.5.10-125.el6 @base samba-winbind-clients.x86_64 3.5.10-125.el6 @base samba4-libs.x86_64 4.0.0-23.alpha11.el6 @base/$releasever samba.x86_64 3.6.9-151.el6 base samba-client.x86_64 3.6.9-151.el6 base samba-common.i686 3.6.9-151.el6 base samba-common.x86_64 3.6.9-151.el6 base samba-doc.x86_64 3.6.9-151.el6 base samba-domainjoin-gui.x86_64 3.6.9-151.el6 base samba-swat.x86_64 3.6.9-151.el6 base samba-winbind.x86_64 3.6.9-151.el6 base samba-winbind-clients.i686 3.6.9-151.el6 base samba-winbind-clients.x86_64 3.6.9-151.el6 base samba-winbind-devel.i686 3.6.9-151.el6 base samba-winbind-devel.x86_64 3.6.9-151.el6 base samba-winbind-krb5-locator.x86_64 3.6.9-151.el6 base samba4.x86_64 4.0.0-55.el6.rc4 base samba4-client.x86_64 4.0.0-55.el6.rc4 base samba4-common.x86_64 4.0.0-55.el6.rc4 base samba4-dc.x86_64 4.0.0-55.el6.rc4 base samba4-dc-libs.x86_64 4.0.0-55.el6.rc4 base samba4-devel.i686 4.0.0-23.alpha11.el6 base samba4-devel.x86_64 4.0.0-55.el6.rc4 base samba4-libs.i686 4.0.0-23.alpha11.el6 base samba4-libs.x86_64 4.0.0-55.el6.rc4 base samba4-pidl.x86_64 4.0.0-55.el6.rc4 base samba4-python.x86_64 4.0.0-55.el6.rc4 base samba4-swat.x86_64 4.0.0-55.el6.rc4 base samba4-test.x86_64 4.0.0-55.el6.rc4 base samba4-winbind.x86_64 4.0.0-55.el6.rc4 base samba4-winbind-clients.x86_64 4.0.0-55.el6.rc4 base samba4-winbind-krb5-locator.x86_64 4.0.0-55.el6.rc4 base sblim-cmpi-samba.i686 1.0-1.el6 base sblim-cmpi-samba.x86_64 1.0-1.el6 base sblim-cmpi-samba-devel.i686 1.0-1.el6 base sblim-cmpi-samba-devel.x86_64 1.0-1.el6 base sblim-cmpi-samba-test.x86_64 1.0-1.el6 base Should I be concerned about the samba-client versus samba3x-client? Should I try to get yum to install a newer version of mount.cifs, or build it from source? Sorry, I'm a bit clueless here. Thanks, David -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
