On 09/06/2011 05:02 PM, Nikola Ciprich wrote:
Hello, I'm trying to solve quite a weird problem on one of our customers' box. It's quad core Xeon X3430 @ 2.40GHz, running 64bit centos with 2.6.38 (I also tried upgrading to 2.6.39). After increasing physical memory from 16 to 20GB, all guest got incredibly slow, starting just one windows or linux guest causes host to be quite slow, and quest seems to be even slower. hardware virtualisation is on, KVM is used, no relevant update since the update. here's about 3 seconds of kvm_stat: kvm_exit 659513 103922 kvm_entry 659505 103920 kvm_emulate_insn 631118 99344 kvm_exit(IO_INSTRUCTION) 625223 98398 kvm_userspace_exit 624979 98359 kvm_pio 624970 98357
How many guests in there? Please post a trace as per http://www.linux-kvm.org/page/Tracing.
but according to atop, there is almost no I/O activity from guests, and running top in them shows them to really be idle... but they eat like 60-70% of host CPU core time each.. Do You have any idea on what should I check? thanks a lot in advance
Please post /proc/mtrr and /proc/iomem. -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
