Hi, I was doing some I/O tuning of our KVM host, and noticed some strange behaviour. When I start some heavy I/O load on guest (ie run some fio benchmark), loadavg value of the host jumps to value about 65 and holds until load ends. sar reports similar number of blocked tasks. I don't really understand those numbers, because only active tasks are 4 qemu-kvm threads and few other sleeping tasks (so none in R or D state). is it possible to somehow find which tasks seem to be blocked? or why is loadavg value so high? the system is x86_64 quad core with 4GB RAM running centos 6 with 3.0.52-rc1 kernel.
Thanks a lot in advance for any answer BR nik -- ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28.rijna 168, 709 00 Ostrava tel.: +420 591 166 214 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: ser...@linuxbox.cz -------------------------------------
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