Hi Ben On Wed, Aug 22, 2018 at 9:22 PM Ben Hutchings <ben@xxxxxxxxxxxxxxx> wrote: > > On Mon, 2018-08-20 at 11:04 +0200, Ricardo Ribalda Delgado wrote: > > Hello Ming > > On Mon, Aug 20, 2018 at 10:30 AM Ming Lei <ming.lei@xxxxxxxxxx> wrote: > [...] > > > One problem found from your iostat log is that looks there is ~30sec > > > idle period between IO activities when blk-mq is enabled. > > > > During all the test the LED on the device was blinking. > > > > But a closer look to dmesg reveals a lot of this messages: > > > > [ 196.929811] sd 6:0:0:0: [sdb] tag#3 data cmplt err -71 uas-tag 1 > > inflight: CMD > > [ 196.929822] sd 6:0:0:0: [sdb] tag#3 CDB: Write(10) 2a 00 00 04 00 > > 68 00 04 00 00 > > [ 227.764379] sd 6:0:0:0: [sdb] tag#4 uas_eh_abort_handler 0 uas-tag > > 2 inflight: CMD OUT > > [ 227.764389] sd 6:0:0:0: [sdb] tag#4 CDB: Write(10) 2a 00 00 04 04 > > 68 00 04 00 00 > > [ 227.766555] sd 6:0:0:0: [sdb] tag#3 uas_eh_abort_handler 0 uas-tag > > 1 inflight: CMD > > [ 227.766562] sd 6:0:0:0: [sdb] tag#3 CDB: Write(10) 2a 00 00 04 00 > > 68 00 04 00 00 > > [ 227.784312] scsi host6: uas_eh_device_reset_handler start > > [ 227.913672] usb 2-2: reset SuperSpeed USB device number 3 using xhci_hcd > > [ 227.944842] scsi host6: uas_eh_device_reset_handler success > > [ 231.416133] sd 6:0:0:0: [sdb] tag#1 data cmplt err -71 uas-tag 10 > > inflight: CMD > > [ 231.416147] sd 6:0:0:0: [sdb] tag#1 CDB: Write(10) 2a 00 00 06 d5 > > e8 00 04 00 00 > > > > And they take around 30 secons (227-196) > > > > > > Maybe this is a hw issue? I will bring the reader home tonight and see > > if I can replicate the bug with my notebook > > > > > > > > Maybe it is related with timeout, given we had big change in v4.17 timeout code, > > > and we also fixed one scsi_mq timeout related issue recently, and the patch[1] has > > > been merged to v4.18 release already. > > > > I tried with v4.18-rc4 (latest one packaged in debian experimental) > > and after 3 runs, 2 were fine (27 sec), but the last one was over a > > minute. > > Is it possible that this is fixed by "block: really disable runtime-pm > for blk-mq"? > > That fix went into Debian's version 4.17.14-1, but is not yet in any > 4.18-based package. Just tried out ricardo@neopili:~$ uname -a Linux neopili 4.17.0-3-amd64 #1 SMP Debian 4.17.17-1 (2018-08-18) x86_64 GNU/Linux and after around 10 executions all the runtimes are similar to the ones with non-blk-mq and I havent seen the "uas error" on dmesg Thanks for your help. I will keep an eye on the issue in case it triggers again > > Ben. > > -- > Ben Hutchings > You can't have everything. Where would you put it? > -- Ricardo Ribalda
