https://bugzilla.kernel.org/show_bug.cgi?id=118081
--- Comment #4 from Liu zhengyuan <liuzhengyuang...@gmail.com> --- Hi, nab: Did you mean doing iozone test on a local disk LUN not a iscsi LUN from the word "are you seeing something different wrt iozone on a Linux host..?"? If so, I didn`t found any different between this two LUN from application perspective. As for iscsi LUN, the iozone would abort due to write system call failure. (In reply to nab from comment #3) > Hey Mike & Co, > > Apologies for missing this bug-report. Comments below. > > (Adding target-devel CC') > > On Fri, 2016-05-13 at 11:19 -0500, Mike Christie wrote: > > On 05/11/2016 10:34 PM, bugzilla-dae...@bugzilla.kernel.org wrote: > > > https://bugzilla.kernel.org/show_bug.cgi?id=118081 > > > > > > Bug ID: 118081 > > > Summary: open-iscsi Ping timeout erro > > > Product: SCSI Drivers > > > Version: 2.5 > > > Kernel Version: 4.4.7 > > > Hardware: All > > > OS: Linux > > > Tree: Mainline > > > Status: NEW > > > Severity: normal > > > Priority: P1 > > > Component: Other > > > Assignee: scsi_drivers-ot...@kernel-bugs.osdl.org > > > Reporter: liuzhengyuang...@gmail.com > > > Regression: No > > > > > > Hi everyone: > > > I create a target using fileio as the backend storage on ARM64 server. The > > > initiator reported some errors showed bellow while perform iozone test. > > > > > > [178444.145679] connection14:0: ping timeout of 5 secs expired, recv > > > timeout > > > 5, last rx 4339462894, last ping 4339464146, now 4339465400 > > > [178444.145706] connection14:0: detected conn error (1011) > > > [178469.674313] connection14:0: detected conn error (1020) > > > [178504.420979] connection14:0: ping timeout of 5 secs expired, recv > > > timeout > > > 5, last rx 4339477953, last ping 4339479204, now 4339480456 > > > [178504.421001] connection14:0: detected conn error (1011) > > > [178532.064262] connection14:0: detected conn error (1020) > > > [178564.584087] connection14:0: ping timeout of 5 secs expired, recv > > > timeout > > > 5, last rx 4339492980, last ping 4339494232, now 4339495484 > > > .............................. > > > > > > I try to trace the function call of target iscsi. Then, I found the > > > receiving > > > thread of target iscsi blocked at fd_execute_sync_cache -> > > > vfs_fsync_range. > > > Further, vfs_fsync_range may takes more than 10 seconds to return,while > > > initiator Ping timeout would happened after 5 seconds. vfs_fsync_range > > > was > > > call with the form vfs_fsync_range(fd_dev->fd_file, 0, LLONG_MAX, 1) every > > > times which means sync all device cache. > > > So, is this a bug? > > > How does Initiator send sync_cache scsi command? > > > Does it need to sync all device cache at once? > > > Any reply would be thankful. > > > > > > > The upper layers like the FS or application determine when to send a > > sync cache. They send down a request and the iscsi layer just sends it > > to the target. > > > > You are using LIO right? It looks like we end up syncing the entire > > device sometimes. I think for iscsi pings/Nops that have the immediate > > bit set, the target would want to reply to them right away. They should > > not be getting stuck behind these type of commands. > > > > Nick, what do you think? > > > > In modern iscsi-target code, the backend sbc_ops->execute_sync_cache() > call is invoked directly from iscsi_trx kthread process context. > > For FILEIO backends, this can block immediate iscsi commands like NOPs > on the same connection (eg: socket) processing a SYNCHRONIZE_CACHE CDB > that is taking a long time to complete. > > Wrt to Liu's follow-up question, an initiator should attempt to retry > all outstanding commands that did not receive a response once the > initiator side NopOut timeout has fired. > > So from an application perspective, the initiator NopOut timeout and > subsequent iscsi session reinstatement should not be propagating up a > SYNCHRONIZE_CACHE failure unless the default 120 second Linux/iSCSI > initiator I/O timeout has elapsed. > > Liu, are you seeing something different wrt iozone on a Linux host..? -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
