On Wed, Aug 3, 2011 at 6:52 AM, Steffie Morris <steffie.morris@xxxxxxxxx> wrote: > Hi, i have some questions (and problems) regarding speed in linux > using mount -t cifs for cifs shares. > > I have several ubuntu 10.10 workstations and a few windows > workstations, on wich i want to interact from one central fileshare. > At the moment i have a fileshare on a windows7 machine, and a > fileshare (samba) on an ubuntu machine. > The netwerk is 1 Gbit > From a windows client uploading/downloading to the linux samba server > i get 115 MB/s. > From a window client uploading/downloading to a windows share i get > around 110 MB/s. linux cifs client may be faster than windows on LInux 3.0 and later kernels on writes to the server, but is usually slower on large file copy from the server due to lack of asynchronous dispatch of read (something Jeff and I have been looking at adding later this year). Even on older kernels, Linux cifs client does much better if multiple processes are running (and against different files/directories) since it looks like we can keep more requests in flight to the server than most other clients - except for the large file copy from the server (async file read) case. > From the linux client uploading to the windows share i get 60 MB/s. > From the linux client uploading to the linux samba server i get 60 MB/s. On current kernels (e.g. Linux 3.0 and 3.01-rc) this (sequential write) should be wire speed - I got >85% wire utilization on GigE even between low end home systems with file copy. (assuming your disks can keep up with this) > From the linux client reading from the windows share i get 17 MB/s. > From t he linux client reading from the linux samba share i get 17MB/s. Reads to the same file will be single threaded on the wire (and relatively smaller than what windows requests, 16K vs. ~60K) - if you have a multithreaded or multiprocess file copy application - you can increase speed of large file copy with mounting with "forcedirectio" > The biggest problem question i face, is why is reading thru a "mount > -t cifs" share this slow? > If the linux machine acts as a server the speed is really fast (in > combination with a windows client) but when i use the linux machine as > a client, the performance is not good. > Am i overlooking something? should i be using special options to > optimize performance for cifs in client mode on linux ? > I think i ruled out hardware network issue's as traffic the other way > around works (with linux as serving share), and also via FTP, or > testing with iperf gives me near full Gbit speeds. -- Thanks, Steve -- 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
