CIFS performance really bad

[zyberzero]

Hi!

I have some issues with the CIFS performance I get out of my box. First, using iperf I get approx 95 Mbytes/s using a single stream, which I guess is quite OK. Standing in a folder in my ZFS volume, Testing

[root@freenas] /mnt/files/media/temp# dd if=/dev/zero of=test.img bs=1M count=2048
2048+0 records in
2048+0 records out
2147483648 bytes transferred in 5.179208 secs (414635526 bytes/sec)

(No compression)

Which is good as well.
However, when using CIFS from an Ubuntu 11.10 i get approx. 30 Mbyte/s. This is the very same computer as I ran iperf between, so I guess there's no networking issue.
AIO is on, sendfile is on and turning on large RW support slowed down the transfer about 5 Mbyte/s.

And yeah, the machine spec:
It's a VM in an ESXi machine.
The machine has en Xeon E3-1230 CPU, which is a quadcore @ 3.2 GHz.
The VM has 5 GB RAM dedicated as of now, and only one core dedicated to it (see this thread: http://forums.freenas.org/showthread.php?3425-Getting-lots-if-quot-Interrupt-storm-on-irq16-quot ).

What can I do/test to increase the performance?

Thanks,
Zyber

 

[zyberzero]

And it's only CIFS that struggles with me. Using the very same setup as before, I can achieve 105 MB/s in writing, and 111 MB/s in reading if I use NFS. So, I guess it's not any problem with my network, or that the hardware is too bad.

/Zyber

 

[zyberzero]

OK. Tested a little. Using Windows 7 on the same (client) computer I get 115 Mbyte/s in constant write and read. That's more like it, so I guess that my Samba client settings is very bad in my ubuntu client.

 

[digitaltrash]

Thanks for following up on your post, that was reassuring. Can you test small file transfer speeds on your rig, like 4Kb files?