Very poor Samba/CIFS performance :(

**solnyshok** · July 9th, 2011

Originally Posted by LordNodens

Using CIFSMaxBufSize=130048 and directio/rsize=130048 options did help in some cases. For example if I try to extract a MKV with MakeMKV the speed rises to 60MB/sec. But if I try to copy a file from Nautilus speed remains at 8-10 MB/sec. That's strange.

Hi, how do you set CIFSMaxBufSize=130048?
I created cifs.conf with this in /etc/modprobe.d/
rebooted
when I do mount -t cifs .... -o ... ,rsize=130048
and then cat /proc/mounts
I still see rsize of 16384

//update ok, i found syntaxis mistake, should be
options cifs CIFSMaxBufSize=130048

**LordNodens** · July 11th, 2011

This is what I use for mounting in fstab:

//.../... /.../... cifs directio,rsize=130048,guest,uid=1000,iocharset=utf 8,codepage=unicode,unicode 0 0

Then I created a file named cifs.conf in /etc/modprobe.d/ which has the following: options cifs CIFSMaxBufSize=130048

**dcstar** · April 9th, 2012

Originally Posted by LordNodens

...........
Then I created a file named cifs.conf in /etc/modprobe.d/ which has the following: options cifs CIFSMaxBufSize=130048

This also improved the performance on shares on my 10.04 system from < 500 Kb/s to > 15 Mb/s.

**Lampi** · May 1st, 2012

I did some testing with cifs in precise, and I noticed cifs performance is considerably better than it was in lucid.

some TR benchmarks from a dm-raid share into /dev/null - tested without MAXBUFSIZE:

60 MB/s using mc and a cifs mountpoint
70 MB/s using cp and a cifs mountpoint
45 MB/s using Nautilus and a cifs mountpoint
30 MB/s using Nautilus with its own samba client implementation

Nautilus still needs some improvement, I have yet to check how dolphin is handling things with the smb// protocol.

But let's assume they finally fixed cifs issues from one LTS to the other.