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Diffstat (limited to 'Documentation/cgroups/net_prio.txt')
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diff --git a/Documentation/cgroups/net_prio.txt b/Documentation/cgroups/net_prio.txt deleted file mode 100644 index a82cbd28e..000000000 --- a/Documentation/cgroups/net_prio.txt +++ /dev/null @@ -1,55 +0,0 @@ -Network priority cgroup -------------------------- - -The Network priority cgroup provides an interface to allow an administrator to -dynamically set the priority of network traffic generated by various -applications - -Nominally, an application would set the priority of its traffic via the -SO_PRIORITY socket option. This however, is not always possible because: - -1) The application may not have been coded to set this value -2) The priority of application traffic is often a site-specific administrative - decision rather than an application defined one. - -This cgroup allows an administrator to assign a process to a group which defines -the priority of egress traffic on a given interface. Network priority groups can -be created by first mounting the cgroup filesystem. - -# mount -t cgroup -onet_prio none /sys/fs/cgroup/net_prio - -With the above step, the initial group acting as the parent accounting group -becomes visible at '/sys/fs/cgroup/net_prio'. This group includes all tasks in -the system. '/sys/fs/cgroup/net_prio/tasks' lists the tasks in this cgroup. - -Each net_prio cgroup contains two files that are subsystem specific - -net_prio.prioidx -This file is read-only, and is simply informative. It contains a unique integer -value that the kernel uses as an internal representation of this cgroup. - -net_prio.ifpriomap -This file contains a map of the priorities assigned to traffic originating from -processes in this group and egressing the system on various interfaces. It -contains a list of tuples in the form <ifname priority>. Contents of this file -can be modified by echoing a string into the file using the same tuple format. -for example: - -echo "eth0 5" > /sys/fs/cgroups/net_prio/iscsi/net_prio.ifpriomap - -This command would force any traffic originating from processes belonging to the -iscsi net_prio cgroup and egressing on interface eth0 to have the priority of -said traffic set to the value 5. The parent accounting group also has a -writeable 'net_prio.ifpriomap' file that can be used to set a system default -priority. - -Priorities are set immediately prior to queueing a frame to the device -queueing discipline (qdisc) so priorities will be assigned prior to the hardware -queue selection being made. - -One usage for the net_prio cgroup is with mqprio qdisc allowing application -traffic to be steered to hardware/driver based traffic classes. These mappings -can then be managed by administrators or other networking protocols such as -DCBX. - -A new net_prio cgroup inherits the parent's configuration. |