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I run CloudStack 4.3 using KVM on an Intel(R) Xeon(R) CPU E5-2620 on Ubuntu 14.04 LTS. When I first start a virtual machine it runs quickly. Over the course of the day it slows down to acceptable. After two days run time, it is virtually unusable. Restarting the VM brings it back to full speed.

This appears to affect both Windows and Linux VMs, though it appears to affect the most heavily machines the most.

I have disabled swap on the host machine. Running iotop, top, and iftop doesn't show anything out of the ordinary. Additionally, the CPUs themselves don't appear to be overtaxed; most of them are running at a lower frequency, though they do spin up when load increases.

No warnings or errors appear in the CloudStack log.

-- System Info --

The other 23 cores are identical.

processor : 23 vendor_id : GenuineIntel cpu family : 6 model : 45 model name : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz stepping : 7 microcode : 0x710 cpu MHz : 2001.000 cache size : 15360 KB physical id : 1 siblings : 12 core id : 5 cpu cores : 6 apicid : 43 initial apicid : 43 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dtherm tpr_shadow vnmi flexpriority ept vpid bogomips : 4002.70 clflush size : 64 cache_alignment : 64 address sizes : 46 bits physical, 48 bits virtual power management:

# cat /proc/cpuinfo | grep MHz | sort | uniq -c 16 cpu MHz : 1200.000 8 cpu MHz : 2001.000

#free total used free shared buffers cached Mem: 65943828 65186960 756868 1744 242204 28397924 -/+ buffers/cache: 36546832 29396996 Swap: 0 0 0

df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/cloud--vg-root 166G 6.3G 152G 4% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 32G 4.0K 32G 1% /dev tmpfs 6.3G 1.4M 6.3G 1% /run none 5.0M 0 5.0M 0% /run/lock none 32G 0 32G 0% /run/shm none 100M 0 100M 0% /run/user /dev/sdc1 236M 37M 188M 17% /boot /dev/mapper/cloud--vg-lv_images 7.3T 1.3T 5.7T 18% /srv/images 172.27.1.1:/srv/images/primary 7.3T 1.3T 5.7T 18% /mnt/cf428915-5736-30ce-b0b1-0535e28ce1b9

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