Re: Guest virtual CPUs limited to only 50% of host CPU
Thanks for the reply. Turns out it was htop reporting it wrong. The utime in /proc/stat already includes guest time. On Tue, Apr 5, 2011 at 2:03 AM, Avi Kivity a...@redhat.com wrote: On 03/31/2011 11:03 PM, Drew Johnson wrote: Hi, I am using Qemu-KVM-0.12.5 This is somewhat old. Try upgrading. on Intel Xeon (Vt-x enabled) processors and monitoring the system using htop on the host. On the processors that are running Qemu-KVM I am seeing a 50/50 split between userspace and guest (gu: in htop). I have pinned the vCPU qemu-kvm threads to specific host CPUs using taskset. In the guest the CPUs are nearly 100% userspace in htop. Does anyone have ideas on why this is? Is there a way I can get much higher utilization for the guest virtual CPUs wrt the host? Please build qemu with --disable-cpu-strip and run 'perf top' to see what's going on. -- 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Guest virtual CPUs limited to only 50% of host CPU
On 03/31/2011 11:03 PM, Drew Johnson wrote: Hi, I am using Qemu-KVM-0.12.5 This is somewhat old. Try upgrading. on Intel Xeon (Vt-x enabled) processors and monitoring the system using htop on the host. On the processors that are running Qemu-KVM I am seeing a 50/50 split between userspace and guest (gu: in htop). I have pinned the vCPU qemu-kvm threads to specific host CPUs using taskset. In the guest the CPUs are nearly 100% userspace in htop. Does anyone have ideas on why this is? Is there a way I can get much higher utilization for the guest virtual CPUs wrt the host? Please build qemu with --disable-cpu-strip and run 'perf top' to see what's going on. -- 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Guest virtual CPUs limited to only 50% of host CPU
Hi, I am using Qemu-KVM-0.12.5 on Intel Xeon (Vt-x enabled) processors and monitoring the system using htop on the host. On the processors that are running Qemu-KVM I am seeing a 50/50 split between userspace and guest (gu: in htop). I have pinned the vCPU qemu-kvm threads to specific host CPUs using taskset. In the guest the CPUs are nearly 100% userspace in htop. Does anyone have ideas on why this is? Is there a way I can get much higher utilization for the guest virtual CPUs wrt the host? Thanks in advance! -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
