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Merge pull request #15400 from vincentbernat/doc/memory-cgroup-overhead

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doc: add a notice about memory accounting overhead
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moxiegirl 2015-08-09 16:38:41 -07:00
commit b173314cca
1 changed files with 8 additions and 3 deletions
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docs/installation/ubuntulinux.md
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@ -190,9 +190,14 @@ When users run Docker, they may see these messages when working with an image:
WARNING: Your kernel does not support cgroup swap limit. WARNING: Your WARNING: Your kernel does not support cgroup swap limit. WARNING: Your
kernel does not support swap limit capabilities. Limitation discarded. kernel does not support swap limit capabilities. Limitation discarded.
To prevent these messages, enable memory and swap accounting on your system. To To prevent these messages, enable memory and swap accounting on your
enable these on system using GNU GRUB (GNU GRand Unified Bootloader), do the system. Enabling memory and swap accounting does induce both a memory
following. overhead and a performance degradation even when Docker is not in
use. The memory overhead is about 1% of the total available
memory. The performance degradation is roughly 10%.
To enable memory and swap on system using GNU GRUB (GNU GRand Unified
Bootloader), do the following:
1. Log into Ubuntu as a user with `sudo` privileges. 1. Log into Ubuntu as a user with `sudo` privileges.