On Wed, Aug 3, 2011 at 10:57 AM, Steve French <smfrench@xxxxxxxxx> wrote: > 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. Also note that Samba's "smbclient" utility (which has an "ftp" like interface) does really well with large file copies - I don't know of anything likely to much faster at the moment for large file copy. -- 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
