[Touch-packages] [Bug 1346687] Re: Ubuntu 14 KVM Guest I/O Elevator Non-configurable
** Package changed: util-linux (Ubuntu) = linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1346687 Title: Ubuntu 14 KVM Guest I/O Elevator Non-configurable Status in “linux” package in Ubuntu: Invalid Bug description: Ubuntu 14.04 guest runs pretty much standard standard configuration: KVM hypervisor, ACPI and APIC enabled, virtio disk bus, raw storage format... While running this project, I am also involved in testing SSD drives across different Linux distributions and their support for discard option (TRIM). To cut the story short, Ubuntu-based KVM guest did not set any scheduler on the boot disk vda): # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk 1 0B 0B vda1 part 1 0B 0B vda2 part 1 0B 0B vda5 part 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B That is in stark contrast with other distributions running almost identical KVM guest configuration (with the exception of the root file system using BTRFS instead of EXT4 on SUSE). Oracle Linux 6.5: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk deadline 1 0B 0B vda1 part deadline 1 0B 0B vda2 part deadline 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B OpenSUSE 13.1: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom cfq 1 0B 0B vda disk cfq 1 0B 0B vda1 part cfq 1 0B 0B vda2 part cfq 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B Indeed, checking elevator capabilities for boot disk on Ubuntu KVM guest showed: # cat /sys/block/vda/queue/scheduler none Other Linux distributions show more options: # cat /sys/block/vda/queue/scheduler noop deadline [cfq] As well, attempts to change the elevator on Ubuntu guest fail. For example: # echo noop /sys/block/vda/queue/scheduler # echo $? 0 # cat /sys/block/vda/queue/scheduler none Setting it globally in /etc/default/grub and updating it via update- grub2 fails too. In the meantime, to automate check of elevators (schedulers) and discard support for SSD drives and thin-provisioned volumes on Linux, I wrote simple Perl script: http://www.circlingcycle.com.au/Unix-sources/Linux-check-IO-scheduler- and-discard-support.pl.txt Part of the results on RHEL 6.5 server would look like: INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk sdb configured with I/O scheduler cfq INFO: SSD sda configured with I/O scheduler deadline supports discard operation INFO: Hard Disk sdc configured with I/O scheduler cfq INFO: Hard Disk sdi configured with I/O scheduler cfq INFO: Hard Disk sdh configured with I/O scheduler cfq The Ubuntu KVM guest runs latest paches: Linux ubuntu14-vm2.circlingcycle.com.au 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Regards, Dusan Baljevic VK2COT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1346687/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1346687] Re: Ubuntu 14 KVM Guest I/O Elevator Non-configurable
As suggested, I added the package for /bin/lsblk. That is probably good enough for initial bug report. Dusan Baljevic ** Package changed: ubuntu = util-linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1346687 Title: Ubuntu 14 KVM Guest I/O Elevator Non-configurable Status in “util-linux” package in Ubuntu: New Bug description: Ubuntu 14.04 guest runs pretty much standard standard configuration: KVM hypervisor, ACPI and APIC enabled, virtio disk bus, raw storage format... While running this project, I am also involved in testing SSD drives across different Linux distributions and their support for discard option (TRIM). To cut the story short, Ubuntu-based KVM guest did not set any scheduler on the boot disk vda): # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk 1 0B 0B vda1 part 1 0B 0B vda2 part 1 0B 0B vda5 part 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B That is in stark contrast with other distributions running almost identical KVM guest configuration (with the exception of the root file system using BTRFS instead of EXT4 on SUSE). Oracle Linux 6.5: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk deadline 1 0B 0B vda1 part deadline 1 0B 0B vda2 part deadline 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B OpenSUSE 13.1: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom cfq 1 0B 0B vda disk cfq 1 0B 0B vda1 part cfq 1 0B 0B vda2 part cfq 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B Indeed, checking elevator capabilities for boot disk on Ubuntu KVM guest showed: # cat /sys/block/vda/queue/scheduler none Other Linux distributions show more options: # cat /sys/block/vda/queue/scheduler noop deadline [cfq] As well, attempts to change the elevator on Ubuntu guest fail. For example: # echo noop /sys/block/vda/queue/scheduler # echo $? 0 # cat /sys/block/vda/queue/scheduler none Setting it globally in /etc/default/grub and updating it via update- grub2 fails too. In the meantime, to automate check of elevators (schedulers) and discard support for SSD drives and thin-provisioned volumes on Linux, I wrote simple Perl script: http://www.circlingcycle.com.au/Unix-sources/Linux-check-IO-scheduler- and-discard-support.pl.txt Part of the results on RHEL 6.5 server would look like: INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk sdb configured with I/O scheduler cfq INFO: SSD sda configured with I/O scheduler deadline supports discard operation INFO: Hard Disk sdc configured with I/O scheduler cfq INFO: Hard Disk sdi configured with I/O scheduler cfq INFO: Hard Disk sdh configured with I/O scheduler cfq The Ubuntu KVM guest runs latest paches: Linux ubuntu14-vm2.circlingcycle.com.au 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Regards, Dusan Baljevic VK2COT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1346687/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1346687] Re: Ubuntu 14 KVM Guest I/O Elevator Non-configurable
Your other distributions are running older kernels. This behavior was changed in the kernel because it does not make sense to run an elevator on virtual devices. You will notice the same thing on bare metal for lvm and raid: they no longer have their own elevator. Instead the IO is passed straight down the stack to the real disk where there is a single elevator managing all IO to that disk, whether it comes from different virtual machines, or logical volumes. ** Changed in: util-linux (Ubuntu) Status: New = Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1346687 Title: Ubuntu 14 KVM Guest I/O Elevator Non-configurable Status in “util-linux” package in Ubuntu: Invalid Bug description: Ubuntu 14.04 guest runs pretty much standard standard configuration: KVM hypervisor, ACPI and APIC enabled, virtio disk bus, raw storage format... While running this project, I am also involved in testing SSD drives across different Linux distributions and their support for discard option (TRIM). To cut the story short, Ubuntu-based KVM guest did not set any scheduler on the boot disk vda): # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk 1 0B 0B vda1 part 1 0B 0B vda2 part 1 0B 0B vda5 part 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B That is in stark contrast with other distributions running almost identical KVM guest configuration (with the exception of the root file system using BTRFS instead of EXT4 on SUSE). Oracle Linux 6.5: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk deadline 1 0B 0B vda1 part deadline 1 0B 0B vda2 part deadline 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B OpenSUSE 13.1: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom cfq 1 0B 0B vda disk cfq 1 0B 0B vda1 part cfq 1 0B 0B vda2 part cfq 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B Indeed, checking elevator capabilities for boot disk on Ubuntu KVM guest showed: # cat /sys/block/vda/queue/scheduler none Other Linux distributions show more options: # cat /sys/block/vda/queue/scheduler noop deadline [cfq] As well, attempts to change the elevator on Ubuntu guest fail. For example: # echo noop /sys/block/vda/queue/scheduler # echo $? 0 # cat /sys/block/vda/queue/scheduler none Setting it globally in /etc/default/grub and updating it via update- grub2 fails too. In the meantime, to automate check of elevators (schedulers) and discard support for SSD drives and thin-provisioned volumes on Linux, I wrote simple Perl script: http://www.circlingcycle.com.au/Unix-sources/Linux-check-IO-scheduler- and-discard-support.pl.txt Part of the results on RHEL 6.5 server would look like: INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk sdb configured with I/O scheduler cfq INFO: SSD sda configured with I/O scheduler deadline supports discard operation INFO: Hard Disk sdc configured with I/O scheduler cfq INFO: Hard Disk sdi configured with I/O scheduler cfq INFO: Hard Disk sdh configured with I/O scheduler cfq The Ubuntu KVM guest runs latest paches: Linux ubuntu14-vm2.circlingcycle.com.au 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Regards, Dusan Baljevic VK2COT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1346687/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1346687] Re: Ubuntu 14 KVM Guest I/O Elevator Non-configurable
** Tags added: trusty -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1346687 Title: Ubuntu 14 KVM Guest I/O Elevator Non-configurable Status in “util-linux” package in Ubuntu: Invalid Bug description: Ubuntu 14.04 guest runs pretty much standard standard configuration: KVM hypervisor, ACPI and APIC enabled, virtio disk bus, raw storage format... While running this project, I am also involved in testing SSD drives across different Linux distributions and their support for discard option (TRIM). To cut the story short, Ubuntu-based KVM guest did not set any scheduler on the boot disk vda): # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk 1 0B 0B vda1 part 1 0B 0B vda2 part 1 0B 0B vda5 part 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B That is in stark contrast with other distributions running almost identical KVM guest configuration (with the exception of the root file system using BTRFS instead of EXT4 on SUSE). Oracle Linux 6.5: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk deadline 1 0B 0B vda1 part deadline 1 0B 0B vda2 part deadline 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B OpenSUSE 13.1: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom cfq 1 0B 0B vda disk cfq 1 0B 0B vda1 part cfq 1 0B 0B vda2 part cfq 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B Indeed, checking elevator capabilities for boot disk on Ubuntu KVM guest showed: # cat /sys/block/vda/queue/scheduler none Other Linux distributions show more options: # cat /sys/block/vda/queue/scheduler noop deadline [cfq] As well, attempts to change the elevator on Ubuntu guest fail. For example: # echo noop /sys/block/vda/queue/scheduler # echo $? 0 # cat /sys/block/vda/queue/scheduler none Setting it globally in /etc/default/grub and updating it via update- grub2 fails too. In the meantime, to automate check of elevators (schedulers) and discard support for SSD drives and thin-provisioned volumes on Linux, I wrote simple Perl script: http://www.circlingcycle.com.au/Unix-sources/Linux-check-IO-scheduler- and-discard-support.pl.txt Part of the results on RHEL 6.5 server would look like: INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk sdb configured with I/O scheduler cfq INFO: SSD sda configured with I/O scheduler deadline supports discard operation INFO: Hard Disk sdc configured with I/O scheduler cfq INFO: Hard Disk sdi configured with I/O scheduler cfq INFO: Hard Disk sdh configured with I/O scheduler cfq The Ubuntu KVM guest runs latest paches: Linux ubuntu14-vm2.circlingcycle.com.au 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Regards, Dusan Baljevic VK2COT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1346687/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1346687] Re: Ubuntu 14 KVM Guest I/O Elevator Non-configurable
Thank you for the update. I am then not sure why it is also wrong in CentOS 7 guest. The inconsistency with other Linux distributions is what I am concerned about... # uname -a Linux centos7-vm2 3.10.0-123.4.2.el7.x86_64 #1 SMP Mon Jun 30 16:09:14 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux # cat /sys/block/vda/queue/scheduler noop [deadline] cfq # ./Linux-check-IO-scheduler-and-discard-support.pl INFO: File systems and raids NAME FSTYPE LABEL UUID MOUNTPOINT sr0 vda ├─vda1 xfs a1652174-58b6-4e97-a3ca-4a2160a31100 /boot └─vda2 LVM2_member fVCpR3-mtm0-J1KU-XG56-IvOx-9Use-tqS0o2 ├─centos_centos7--vm2-swap swap ad6f9fd9-59a5-49b2-afe9-531a8b74a446 [SWAP] └─centos_centos7--vm2-root xfs 63a2a109-cb5a-4b75-ac63-b903d81df633 / INFO: Block devices NAME ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE RA WSAME sr0 0512 0 512 5121 cfq 128 1280B vda 0512 0 512 5121 deadline 128 40960B ├─vda1 0512 0 512 5121 deadline 128 40960B └─vda2 0512 0 512 5121 deadline 128 40960B ├─centos_centos7--vm2-swap 0512 0 512 5121 128 40960B └─centos_centos7--vm2-root 0512 0 512 5121 128 40960B INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk vda configured with I/O scheduler deadline All other KVM guests that I run exhibit different reports from Ubuntu 14.01: OpenSUSE Linux 13.1 (3.11.10-17.x86_64 #1 SMP PREEMPT) Oracle Linux 6.5 (3.8.13-35.1.2.el6uek.x86_64 #2 SMP) CentOS Linux 7.0.1406 (3.10.0-123.4.2.el7.x86_64 #1 SMP) Regards, Dusan -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/1346687 Title: Ubuntu 14 KVM Guest I/O Elevator Non-configurable Status in “util-linux” package in Ubuntu: Invalid Bug description: Ubuntu 14.04 guest runs pretty much standard standard configuration: KVM hypervisor, ACPI and APIC enabled, virtio disk bus, raw storage format... While running this project, I am also involved in testing SSD drives across different Linux distributions and their support for discard option (TRIM). To cut the story short, Ubuntu-based KVM guest did not set any scheduler on the boot disk vda): # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk 1 0B 0B vda1 part 1 0B 0B vda2 part 1 0B 0B vda5 part 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B That is in stark contrast with other distributions running almost identical KVM guest configuration (with the exception of the root file system using BTRFS instead of EXT4 on SUSE). Oracle Linux 6.5: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom deadline 1 0B 0B vda disk deadline 1 0B 0B vda1 part deadline 1 0B 0B vda2 part deadline 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B OpenSUSE 13.1: # lsblk -io KNAME,TYPE,SCHED,ROTA,DISC-GRAN,DISC-MAX KNAME TYPE SCHED ROTA DISC-GRAN DISC-MAX sr0 rom cfq 1 0B 0B vda disk cfq 1 0B 0B vda1 part cfq 1 0B 0B vda2 part cfq 1 0B 0B dm-0 lvm 1 0B 0B dm-1 lvm 1 0B 0B Indeed, checking elevator capabilities for boot disk on Ubuntu KVM guest showed: # cat /sys/block/vda/queue/scheduler none Other Linux distributions show more options: # cat /sys/block/vda/queue/scheduler noop deadline [cfq] As well, attempts to change the elevator on Ubuntu guest fail. For example: # echo noop /sys/block/vda/queue/scheduler # echo $? 0 # cat /sys/block/vda/queue/scheduler none Setting it globally in /etc/default/grub and updating it via update- grub2 fails too. In the meantime, to automate check of elevators (schedulers) and discard support for SSD drives and thin-provisioned volumes on Linux, I wrote simple Perl script: http://www.circlingcycle.com.au/Unix-sources/Linux-check-IO-scheduler- and-discard-support.pl.txt Part of the results on RHEL 6.5 server would look like: INFO: I/O elevator (scheduler) and discard support summary INFO: Hard Disk sdb configured with I/O scheduler cfq INFO: SSD sda configured with I/O scheduler deadline supports discard operation INFO: Hard Disk sdc configured with I/O scheduler cfq INFO:
