Bug 1649 - openvz kernel seems not to have ioprio configured
openvz kernel seems not to have ioprio configured
Status: RESOLVED INVALID
Product: OpenVZ
Classification: Unclassified
Component: kernel
zzz-2.6.32-ovz-obsoleted
x86 (i386) Debian
: P2 major
Assigned To: Pavel Emelyanov
Depends on:
Blocks:
  Show dependency treegraph
 
Reported: 2010-09-14 19:05 EDT by Andres Martinson
Modified: 2010-11-05 11:13 EDT (History)
4 users (show)

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Description Andres Martinson 2010-09-14 19:05:44 EDT
Squeeze Openvz does not allow to start a container with a configured
IOPRIO variable ( http://wiki.openvz.org/Ioprio ).
Once the variable has commented out or removed the container can be started.
There is a possibility that vzctl has lost its capability to handle
ioprio correctly but I don't know of a way of verifying.

# vzctl set 102 --ioprio 2 --save
Saved parameters for CT 102
# grep IOPRIO /etc/vz/conf/102.conf
IOPRIO="2"

# vzctl start 102
Starting container ...
Container is mounted
Adding IP address(es): x.x.x.102
Setting CPU units: 1000
Warning: ioprio feature is not supported by kernel. skipped ioprio configure
Container start failed
Stopping container ...
Container was stopped
Container is unmounted

Debian bug tracker link http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=596772

-- Package-specific info:
** Version:
Linux version 2.6.32-5-openvz-686 (Debian 2.6.32-21)
(ben@decadent.org.uk) (gcc version 4.3.5 (Debian 4.3.5-2) ) #1 SMP Wed
Aug 25 16:19:28 UTC 2010

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-openvz-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Comment 1 Daniel Hahler 2010-10-14 15:52:03 EDT
Apparently this feature requires CONFIG_BLK_CGROUP, which is not available with stock 2.6.32 (only available from 2.6.33 according to http://cateee.net/lkddb/web-lkddb/BLK_CGROUP.html).

However, the OpenVZ patch contains this config, but it does not get enabled via the Debian build config.

It is likely to be an issue with Debian, and I will provide more information over there, after testing it.
Comment 2 Daniel Hahler 2010-10-14 17:27:10 EDT
I am closing this: after configuring CONFIG_BLK_CGROUP=y and CONFIG_CFQ_GROUP_IOSCHED=y this works with the Debian kernel.