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lastsequence
2016 Apr 10
2
CentOS7, Xen 4.6.1, kernel 3.18.25-19 strange performance problem
...-virt Xen since a long time on my workstation and usually
never check performance. However, yesterday I booted into the 3.18.25-19
Dom0 kernel *without* Xen and found the system noticably more
responsive. That triggered me into running a simple kernel compile
benchmark and compare the results:
Testsequence:
echo 3 > /proc/sys/vm/drop_caches
make distclean
cp ../.config . #copies an existing valid config for compile
make oldconfig
time make -j <threads> bzImage
Results:
xen 4.6.1 - kernel 3.18.25-19
16 threads:
real 1m41.983s
user 16m37.247s
sys 5m7.121s
32 threads:
real 1m29.240s...