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Use BFQ IO scheduler

Budget Fair Queueing (BFQ) Storage-I/O Scheduler * Why do I want BFQ? -Seems to speed up disk based IO see the Source section for more info. http://algo.ing.unimo.it/people/paolo/disk_sched/

* First collect your existing kernel configuration.

zcat /proc/config.gz > BFQ_CONFIG

* Next prepare your BFQ_CONFIG file. (use vi or nano etc.) I like to locate “CONFIG_DEFAULT_CFQ” section and make it look like the below. Be careful not to have duplicate lines. I'm thinking there is a better way maybe someone could point it out. Basically add the two lines about BFQ change the existing CONFIG_DEFAULT_CFQ to “is not set” and add “CONFIG_DEFAULT_BFQ=y'

CONFIG_IOSCHED_BFQ=y
CONFIG_CGROUP_BFQIO=y
# CONFIG_DEFAULT_DEADLINE is not set
# CONFIG_DEFAULT_CFQ is not set
CONFIG_DEFAULT_BFQ=y

* Now grab the code: (I'm using 3.14 in this sample as Slackware-current is currently using 3.14.18)

VERSION=3.14.0-v7r6 # the version you want
wget -nd --no-parent --level 1 -r -R "*.html*" --reject $VERSION \
    http://algo.ing.unimo.it/people/paolo/disk_sched/patches/$VERSION

* Next copy these files to /usr/src/linux and then patch. (You'll want 0001 to 0003)

cp ./000* /usr/src/linux;cd /usr/src/linux
patch -p1 < 0001-block-cgroups-kconfig-build-bits-for-BFQ-v7r6-3.14.patch 
patch -p1 < 0002-block-introduce-the-BFQ-v7r6-I-O-sched-for-3.14.patch 
patch -p1 < 0003-block-bfq-add-Early-Queue-Merge-EQM-to-BFQ-v7r6-for-3.14.0.patch

* Now copy your config file to /usr/src/linux and rename it .config example: (assuming the config you created above is in your home directory)

 cp /$HOME/BFQ_CONFIG /usr/src/linux.config

* cd /usr/src/linux ;make oldconfig ;make -j4 && make modules_install

* copy bzImage and System.map to boot folder

* add lilo entry and update lilo.

* More Details here Building a Linux Kernel from Source

Sources

* Original source: http://algo.ing.unimo.it/people/paolo/disk_sched/sources.php * Originally written by ricky_cardo * Idea from rpi work by ponce adding bfq


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