thank you for this great explanation. We have similar problems with Citrix and a netapp NAS device and I am wondering, if this may have the same reason....
This is not related to samba... But your explanation of the original problem may be a good input... Thank you very much.
greetings
Hansj�rg
Windows uses one TCP/IP connection to connect to a single server. Windows NT Terminal server had a registry switch to make it spit it up as one-per-user, as there ware problem with only 1000 open files (or something like that). MS fixed their bug, so removed the setting.
The problem is that unlike NT, Samba is not multithreaded - it deals with the operations from the client in a strictly serial fashion. This is usually fine for a single PC, and becosue multiple client PCs all use their own seperate TCP/IP connection, Samba scales really well.
However, when all the work is on one TCP/IP connection, all the changes between user (seteuid calls) and even worse blocking due to simple disk IO is serialised. Ie, other unreated operations cannot complete. (I think that the fcntl() issues might also make this even worse, but jra would know better).
By forcing Windows to make multiple TCP/IP connections to the Samba server, we get back to the situation we had with multiple windows client PCs.
Much of the work on Samba4 is to create a compleatly asyncronous design, which can cope with this stuff very well, but until then, we need the workarounds...
Andrew Bartlett
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