Take a look at http://nfs.sourceforge.net/ The upshot is that NFS defaults to "hard" mounts which means clients will retry an operation until it succeeds, possibly forever. It sounds like you want a "soft" mount instead, which will time out operations that get no response. Note that using "soft" may impact data integrity. On Oct 11, 2010, at 4:46 AM, Ivan Chan wrote: > Hi all, > > I am facing a problem in 2.6.32-31 kernel, when I try to fetch > something from nfs server, and if there is no response server, for > example loss IP. > The user task will hang, and after scanning the RPC code, I think the > user task is actualy being slept by RPC, and will not wake up until it > get response from server. > The following is the log, it show the RPC retry, and finally > disconnect, However the use applcaiton is still hang/(sleep). I am > new to this, I don't know it is a design purpose for some condition or > it should be fixed in generel. But in my use case, I hope the user > application can know there is error from NFS/RPC, such that it can > dicide to do the fail response. But I don't read the RPC code in deep > yet, > would you please suggest me which part I should focus , thanks a lot. > > [363855.998281] NFS: permission(0:18/1443226), mask=0x1, res=0 > [363855.998286] NFS: dentry_delete(/out_A1.mp4, 88) > [363855.998303] NFS: permission(0:18/1443226), mask=0x1, res=0 > [363855.998308] NFS: dentry_delete(/out_A3.mp4, 88) > [363855.998325] NFS: permission(0:18/1443226), mask=0x1, res=0 > [363855.998329] NFS: dentry_delete(/zero, 88) > [363895.460527] RPC: 172 reserved req c344a000 xid 5f9ff6fe > [363895.460531] RPC: 172 xprt_prepare_transmit > [363895.460536] RPC: 172 xprt_transmit(96) > [363895.460556] RPC: 172 xmit complete > [363955.460015] RPC: 172 xprt_timer > [363955.460020] RPC: 172 xprt_prepare_transmit > [363955.460025] RPC: 172 xprt_transmit(96) > [363955.460037] RPC: 172 xmit complete > [364075.460015] RPC: 172 xprt_timer > [364075.460021] nfs: server 192.168.100.91 not responding, still trying > [364075.460025] RPC: 172 xprt_prepare_transmit > [364075.460030] RPC: 172 xprt_transmit(96) > [364075.460042] RPC: 172 xmit complete > [364135.460015] RPC: 172 xprt_timer > [364135.460020] RPC: 172 xprt_prepare_transmit > [364135.460026] RPC: 172 xprt_transmit(96) > [364135.460038] RPC: 172 xmit complete > [364255.460017] RPC: 172 xprt_timer > [364255.460022] RPC: 172 xprt_prepare_transmit > [364255.460027] RPC: 172 xprt_transmit(96) > [364255.460039] RPC: 172 xmit complete > [364315.460023] RPC: 172 xprt_timer > [364315.460028] RPC: 172 xprt_prepare_transmit > [364315.460033] RPC: 172 xprt_transmit(96) > [364315.460045] RPC: 172 xmit complete > [364435.460017] RPC: 172 xprt_timer > [364435.460023] RPC: 172 xprt_prepare_transmit > [364435.460028] RPC: 172 xprt_transmit(96) > [364435.460041] RPC: 172 xmit complete > [364495.460016] RPC: 172 xprt_timer > [364495.460021] RPC: 172 xprt_prepare_transmit > [364495.460026] RPC: 172 xprt_transmit(96) > [364495.460038] RPC: 172 xmit complete > [364615.460016] RPC: 172 xprt_timer > [364615.460022] RPC: 172 xprt_prepare_transmit > [364615.460027] RPC: 172 xprt_transmit(96) > [364615.460039] RPC: 172 xmit complete > [364675.460016] RPC: 172 xprt_timer > [364675.460021] RPC: 172 xprt_prepare_transmit > [364675.460026] RPC: 172 xprt_transmit(96) > [364675.460039] RPC: 172 xmit complete > [364795.460017] RPC: 172 xprt_timer > [364795.460022] RPC: 172 xprt_prepare_transmit > [364795.460027] RPC: 172 xprt_transmit(96) > [364795.460040] RPC: 172 xmit complete > [364855.460015] RPC: 172 xprt_timer > [364855.460020] RPC: 172 xprt_prepare_transmit > [364855.460025] RPC: 172 xprt_transmit(96) > [364855.460037] RPC: 172 xmit complete > [364944.152011] RPC: disconnected transport c3682000 > [364944.152021] RPC: 172 xprt_prepare_transmit > [364944.152026] RPC: 172 xprt_transmit(96) > [364944.152031] RPC: disconnected transport c3682000 > [364944.152037] RPC: 172 xprt_connect xprt c3682000 is not connected > [364944.152052] RPC: disconnected transport c3682000 > [364944.152058] RPC: 172 xprt_connect_status: retrying > [364944.152061] RPC: 172 xprt_prepare_transmit > [364944.152064] RPC: 172 xprt_transmit(96) > [364944.152066] RPC: disconnected transport c3682000 > [364944.152070] RPC: 172 xprt_connect xprt c3682000 is not connected > > Regards, > Ivan > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- chuck[dot]lever[at]oracle[dot]com -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
