Jeff Layton wrote: > On Fri, 03 Dec 2010 21:54:13 -0600 > "Christopher R. Hertel" <crh@xxxxxxxxx> wrote: > >> Jeff Layton wrote: >> : >> : >>> Timeouts: >>> ========= >>> It's tempting to think of SMB as being very similar to NFS/RPC, but >>> when it comes to low-level transport, there are significant >>> differences. ONC-RPC was designed for connectionless transports and has >>> the concept of a retransmission. SMB however does not -- it was >>> originally layered on NetBIOS sessions and so has always been assumed >>> to run on a connection-based transport. >> ...with the exception of the Direct Hosted IPX transport. IPX is >> connectionless. In order to accommodate this connectionless transport, SMB >> was actually modified (slightly). >> >> That may seem to be in the "who cares" category, since those old transports >> are essentially dead (much more dead than NBT, or even NBF). Unfortunately, >> the code to handle the old transports is still there in Windows, so there >> are behaviors -- things like the timeouts you're talking about and the weird >> VC=0 shutdown behvior -- that exist because of these old disused transports. >> >> Ugh. Eh? >> > > Yeah, Direct Hosted IPX is a lot more like NFS/RPC. MS essentially > shoehorned in a way to do request retransmissions. It's a pretty > impressive kludge! I suppose we could theorize that that legacy is why > Windows times out individual requests so aggressively, but maybe there > are other design concerns behind that behavior. I've seen the source code. [Aiigh! Bleach the eyes!] I think that this is the primary reason for the timeout, but yeah... there are other factors that are likely involved. > In this case however it really is a "don't care" for us in Linux CIFS > land since we have never implemented it on top of IPX or any other > non-connected transport and have no plans to do so. Yep! I agree with Volker's vote that this is a case in which third-party implementations should do "the right thing" rather than "what Windows does". Chris -)----- -- "Implementing CIFS - the Common Internet FileSystem" ISBN: 013047116X Samba Team -- http://www.samba.org/ -)----- Christopher R. Hertel jCIFS Team -- http://jcifs.samba.org/ -)----- ubiqx development, uninq. ubiqx Team -- http://www.ubiqx.org/ -)----- crh@xxxxxxxxxxxx OnLineBook -- http://ubiqx.org/cifs/ -)----- crh@xxxxxxxxx -- 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
