> Il giorno 10 feb 2017, alle ore 20:49, Paolo Valente <paolo.valente@xxxxxxxxxx> ha scritto: > >> >> Il giorno 10 feb 2017, alle ore 19:13, Bart Van Assche <bart.vanassche@xxxxxxxxxxx> ha scritto: >> >> On 02/10/2017 08:49 AM, Paolo Valente wrote: >>>> $ grep '^C.*_MQ_' .config >>>> CONFIG_BLK_MQ_PCI=y >>>> CONFIG_MQ_IOSCHED_BFQ=y >>>> CONFIG_MQ_IOSCHED_DEADLINE=y >>>> CONFIG_MQ_IOSCHED_NONE=y >>>> CONFIG_DEFAULT_MQ_BFQ_MQ=y >>>> CONFIG_DEFAULT_MQ_IOSCHED="bfq-mq" >>>> CONFIG_SCSI_MQ_DEFAULT=y >>>> CONFIG_DM_MQ_DEFAULT=y >>>> >>> >>> Could you reconfigure with none or mq-deadline as default, check >>> whether the system boots, and, it it does, switch manually to bfq-mq, >>> check what happens, and, in the likely case of a failure, try to get >>> the oops? >> >> Hello Paolo, >> >> I just finished performing that test with the following kernel config: >> $ grep '^C.*_MQ_' .config >> CONFIG_BLK_MQ_PCI=y >> CONFIG_MQ_IOSCHED_BFQ=y >> CONFIG_MQ_IOSCHED_DEADLINE=y >> CONFIG_MQ_IOSCHED_NONE=y >> CONFIG_DEFAULT_MQ_DEADLINE=y >> CONFIG_DEFAULT_MQ_IOSCHED="mq-deadline" >> CONFIG_SCSI_MQ_DEFAULT=y >> CONFIG_DM_MQ_DEFAULT=y >> >> After the system came up I logged in, switched to the bfq-mq scheduler >> and ran several I/O tests against the boot disk. > > Without any failure, right? > > Unfortunately, as you can imagine, no boot failure occurred on > any of my test systems so far :( > > This version of bfq-mq can be configured to print all its activity in > the kernel log, by just defining a macro. This will of course slow > down the system so much to make it probably unusable, if bfq-mq is > active from boot. Yet, the failure may still occur so early to make > this approach useful to discover where bfq-mq gets stuck. As of now I > have no better ideas. Any suggestion is welcome. > Hi Bart, I have found a machine crashing at boot, yet not only when bfq-mq is chosen, but also when mq-deadline is chosen as the default scheduler. I have found and just reported the cause of the failure, together with a fix. Probably this is not the cause of your failure, but what do you think about trying this fix? BTW, I have rebased the branch [1] against the new commits in Jens for-4.11/next. Otherwise, if you have no news or suggestions, would you be willing to try my micro-logging proposal? Thanks, Paolo [1] https://github.com/Algodev-github/bfq-mq > Thanks, > Paolo > >> Sorry but nothing >> interesting appeared in the kernel log. >> >> Bart. >> Western Digital Corporation (and its subsidiaries) E-mail Confidentiality Notice & Disclaimer: >> >> This e-mail and any files transmitted with it may contain confidential or legally privileged information of WDC and/or its affiliates, and are intended solely for the use of the individual or entity to which they are addressed. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited. If you have received this e-mail in error, please notify the sender immediately and delete the e-mail in its entirety from your system.
