Wanted to try out an rt kernel for my asterisk box. One option is to build a patched kernel..
The other option I am trying out now is to install using the Cern repo. I am using a plain Centos 7 installation and not the Cern version.
At the time of writing this I had to install an older version of tuned in order to successfully finish the process:
Some initial tests:
RT Version (VM):
Normal Version (VM):
After repeating the VM tests, I concluded that the VM is not the proper way to test. I will try it on real hardware later and post the results.
Normal Version (E5140 - 2 Cores):
yum install http://ftp.ntua.gr/mirror/centos/7.2.1511/updates/x86_64/Packages/tuned-2.5.1-4.el7_2.6.noarch.rpmInstall the repo in /etc/yum.repos.d/Centos-RT.repo:
[rt] name=CentOS-$releasever - RealTime baseurl=http://linuxsoft.cern.ch/cern/centos/$releasever/rt/$basearch/ gpgcheck=1 enabled=1 protect=1 priority=10 gpgkey=http://linuxsoft.cern.ch/cern/centos/7/os/x86_64/RPM-GPG-KEY-cernFinally yum groupinstall RT should install the rt kernel. Reboot to use. I am currently trying it on a VM and so far no issues.
Some initial tests:
RT Version (VM):
chrt -f 99 ./cyclictest -t1 -p 80 -i 10000 -n -l 100000 # /dev/cpu_dma_latency set to 0us policy: fifo: loadavg: 0.12 0.16 0.10 1/120 10969 T: 0 (10960) P:80 I:10000 C: 16390 Min: 6 Act: 20 Avg: 70 Max: 12866 hdparm -t /dev/sda2 /dev/sda2: Timing buffered disk reads: 976 MB in 3.07 seconds = 317.71 MB/sec
Normal Version (VM):
chrt -f 99 ./cyclictest -t1 -p 80 -i 10000 -n -l 100000 # /dev/cpu_dma_latency set to 0us policy: fifo: loadavg: 0.95 0.37 0.14 1/108 10165 T: 0 ( 8828) P:80 I:10000 C: 4838 Min: 5 Act: 413 Avg: 210 Max: 7676 hdparm -t /dev/sda2 Timing buffered disk reads: 1014 MB in 3.01 seconds = 336.37 MB/sec
After repeating the VM tests, I concluded that the VM is not the proper way to test. I will try it on real hardware later and post the results.
Normal Version (E5140 - 2 Cores):
chrt -f 99 ./cyclictest -t1 -p 80 -i 10000 -n -l 100000 # /dev/cpu_dma_latency set to 0us policy: fifo: loadavg: 0.10 0.04 0.05 1/332 9408 T: 0 ( 9339) P:80 I:10000 C: 6901 Min: 3 Act: 3 Avg: 6 Max: 4503 hdparm -t /dev/sda2 Timing buffered disk reads: 526 MB in 3.01 seconds = 175.04 MB/sec
