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[Kaizoku <1436319@xxxxxxxxxxxxxxxxxx>]

uname -a
Linux test 4.0.0-040000rc5-generic #201503230035 SMP Mon Mar 23 04:36:26 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

cat /sys/block/vda/queue/scheduler
none

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1436319

Title:
  Unable to increase nr_requests & change I/O scheduler ...

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Anyone know why ubuntu utopic/trusty doesn’t allow to change
  nr_requests and I/O scheduler for instance that is running on the
  cloud running openstack havana?

  echo 129 > /sys/block/vda/queue/nr_requests
  -bash: echo: write error: Invalid argument

  
  However values lower then 129 works. 

  Thanks
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Mar 24 06:50 seq
   crw-rw---- 1 root audio 116, 33 Mar 24 06:50 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 14.04
  Ec2AMI: ami-000000a3
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: ra.intel.ssd.xl4
  Ec2Kernel: aki-00000002
  Ec2Ramdisk: ari-00000002
  HibernationDevice: RESUME=UUID=7b7c8950-fe4d-4322-9a60-48dadc7d5eba
  InstallationDate: Installed on 2014-04-16 (343 days ago)
  InstallationMedia:
   
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: OpenStack Foundation OpenStack Nova
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   SHELL=/bin/bash
   TERM=vt100
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   XDG_RUNTIME_DIR=<set>
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-33-generic root=UUID=afee8cc2-d9a0-4f30-8454-94e974e89bf4 ro console=tty1 console=ttyS0
  ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-33-generic N/A
   linux-backports-modules-3.16.0-33-generic  N/A
   linux-firmware                             1.127.11
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty ec2-images
  Uname: Linux 3.16.0-33-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnOpenStackFoundation:pnOpenStackNova:pvr2013.2.2:cvnBochs:ct1:cvr:
  dmi.product.name: OpenStack Nova
  dmi.product.version: 2013.2.2
  dmi.sys.vendor: OpenStack Foundation

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