Hi Chuck, Thanks for your response, but I try to mount via udp, it still cannot wake up user task, The log just show one time "not responding, still trying", and then keep retry, even without disconnect notification. [57993.843932] RPC: 172 xprt_prepare_transmit [57993.843935] RPC: 172 xprt_cwnd_limited cong = 0 cwnd = 512 [57993.843939] RPC: 172 xprt_transmit(92) [57996.840019] RPC: 172 xprt_prepare_transmit [57996.840026] RPC: 172 xprt_transmit(92) [57999.840019] RPC: 172 xprt_prepare_transmit [57999.840025] RPC: 172 xprt_transmit(92) [58002.840016] nfs: server 192.168.100.91 not responding, still trying [58002.840022] RPC: 172 xprt_prepare_transmit [58002.840027] RPC: 172 xprt_transmit(92) [58005.840016] RPC: 172 xprt_prepare_transmit [58005.840022] RPC: 172 xprt_transmit(92) [58008.840015] RPC: 172 xprt_prepare_transmit [58008.840021] RPC: 172 xprt_transmit(92) [58011.844024] RPC: 172 xprt_prepare_transmit Regards, Ivan On Mon, Oct 11, 2010 at 11:17 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > 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
