Ok, I am not an Ubuntu user, but suffered from the same problem with
archlinux. And I have found a solution (at least for me, hope it works
for you too).
Short my problem:
Setup: Synology Diskstation 209 NAS connected over 1 Gigabit network to
my pc
Read performance using smbclient: about 55 Megabyte/s
Read performance using kde-kio-smb: about 12 Megabyte/s
Read performance using cifs: about 5-6 Megabyte/s !
(For reference: with Windows 7 I get about 64 mb/s, with ftp it is
about 70 mb/s)
I looked into it with wireshark to find out, that cifs reads in 4096
bytes blocks, while smbclient uses bigger blocks.
Setting rsize has not effect on it (always 4096 byte blocks).
Well, to make it short, here what changed it:
1. Setting CIFSMaxBufSize=130048 as kernel module option for the cifs module
(don't know about Ubuntu but i believe a line "options cifs
CIFSMaxBufSize=130048" in /etc/modprobe.d/modprobe.conf should do it)
2. Use direct and rsize=130048 as mount options
Without direct as mount option, it seems to ignore the value set for
rsize. (
With these changes it get about 62 Megabyte/second with cifs :-)
Here a part from the cifs readme about the "direct" setting:
"Do not do inode data caching on files opened on this mount.
This precludes mmapping files on this mount. In some cases
with fast networks and little or no caching benefits on the
client (e.g. when the application is doing large sequential
reads bigger than page size without rereading the same data)
this can provide better performance than the default
behavior which caches reads (readahead) and writes
(writebehind) through the local Linux client pagecache
if oplock (caching token) is granted and held. Note that
direct allows write operations larger than page size
to be sent to the server."
I hope that works for you
Daniel
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https://bugs.launchpad.net/bugs/471512
Title:
Slow cifs ubuntu 9.10
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