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
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
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
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
>
>
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
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
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
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
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