Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-23 Thread Ricardo Ribalda Delgado
n 4.17.1 > > > > Please take a look to this > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906328 > > Talk to the upstream kernel developers (linux-bl...@vger.kernel.org). > > The old block layer is going to be removed in favour of blk-mq > eventually, so I don't see any

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Ben Hutchings
On Fri, 2018-08-17 at 13:00 +0200, Ricardo Ribalda Delgado wrote: > Hi Ben > > I am experience some very bad performace with SCSI_MQ_DEFAULT, That > was enabled on Debian 4.17.1 > > Please take a look to this > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906328

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Ricardo Ribalda Delgado
Seems that on kernel 4.17 Debian decided to change the default configuration. Maybe we should ping the kernel group? ricardo@neopili:~/curro/kernel-cleanup$ cat /boot/config-4.17.0-1-amd64 | grep CONFIG_SCSI_MQ_DEFAULT CONFIG_SCSI_MQ_DEFAULT=y ricardo@neopili:~/curro/kernel-cleanup$ cat

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Ricardo Ribalda Delgado
Booting 4.17 with the kernel option scsi_mod.use_blk_mq=0 returns the write time to the original 25.8 sec On Fri, Aug 17, 2018 at 12:15 PM Ricardo Ribalda Delgado wrote: > > It is a CFast connected via USB3 > > Digging a bit, seems to be related to the module option: > > scsi_mod.use_blk_mq > >

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Ricardo Ribalda Delgado
It is a CFast connected via USB3 Digging a bit, seems to be related to the module option: scsi_mod.use_blk_mq which is true on the new kernel and false on the old kernel. On Fri, Aug 17, 2018 at 12:12 PM Simon McVittie wrote: > > On Fri, 17 Aug 2018 at 10:27:47 +0200, Ricardo Ribalda Delgado

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Simon McVittie
On Fri, 17 Aug 2018 at 10:27:47 +0200, Ricardo Ribalda Delgado wrote: > Current version of bmap on combination with the current debian kernel gives a > terrible low performance: ... > $sudo bmaptool copy image.wic /dev/sdb What sort of hardware is /dev/sdb? I think recent kernels offer different

Bug#906328:

2018-08-17 Thread Ricardo Ribalda Delgado
Booting with the kernel Linux neopili 4.16.0-2-amd64 #1 SMP Debian 4.16.16-2 (2018-06-22) x86_64 GNU/Linux Writing the same image only takes 25.7s: And these are the avilable schdulers $ cat /sys/block/sdb/queue/scheduler noop deadline [cfq] -- Ricardo Ribalda

Bug#906328: bmap-tools: slow write: failed to enable I/O optimization, expect suboptimal speed

2018-08-17 Thread Ricardo Ribalda Delgado
Package: bmap-tools Version: 3.4-2 Severity: normal Dear Maintainer, Current version of bmap on combination with the current debian kernel gives a terrible low performance: $uname -a Linux neopili 4.17.0-1-amd64 #1 SMP Debian 4.17.8-1 (2018-07-20) x86_64 GNU/Linux $sudo bmaptool copy