search for: overcommited

Hello, I am running a functional Xen 4.0 platform. The objective is the project I am currently running is to replace 4 VMWare ESX by 4 Xen 4.0 hypervisors. I have been able to reproduce all the core VMWare features in Xen (but better of course =D) except memory overcommitment. I know this feature has been included since Xen 3.3 but I have found almost no information about it. When I try to

My test box has an AMD dual core processor in it, giving me 2 physical cpu''s. If I overcommit the vcpu''s (eg vcpus=4) to simulate a 4 cpu machine, how accurate a simulation should it be (apart from performance sucking badly)? James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

...on raid partitions? I was thinking about maybe swapping on a raid10 device, otherwise an LVM spanning multiple drives. 2. In practice, what kinds of swap allocation are people finding useful for a kvm virtual host of this size? I definitely don't want a system that is so overcommited that performance is impacted, but if some overcommitment is reasonable for VM's that have light workload, then I consider that. I can increase system resources when that becomes necessary. Nataraj -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://list...

This patch adds the necessary KVM specific code to allow KVM to support the CPU halting and kicking operations needed by the queue spinlock PV code. Two KVM guests of 20 CPU cores (2 nodes) were created for performance testing in one of the following three configurations: 1) Only 1 VM is active 2) Both VMs are active and they share the same 20 physical CPUs (200% overcommit) 3) Both VMs are

Hi. Xen 3.3.1 I create limits: memory - in directive memory in start, xm sched-credit - to limts cpu. But I cant overcommit cpu and memory. Is it possible? -- Best Regards, alex.faq8@gmail.com _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users

Hi. I want use xen with dynamic slices. For example, I have 20 domU based on FreeBSD, xen hypervisor 3.3.1, Debian Lenny dom0 system. All domUs have 80Gb LVM partitions, but realy they use 20 of this 80Gb and I want to create more domU''s. How can I do it? I know that some virtualisation have possibility to do dynamic slices(4 example Virtul box) -- Best Regards, alex.faq8@gmail.com

This reverts commit 5500cdbe14d7435e04f66ff3cfb8ecd8b8e44ebf. We had numerous reports of premature ENOSPC that were bisected to this patch. Reverting will not break things but a warning in ''use_block_rsv'' may show up in the syslog. There''s no alternative fix in sight and the ENOSPC problem affects all 3.3 btrfs users during normal filesystem use. CC:

This patch adds the necessary KVM specific code to allow KVM to support the CPU halting and kicking operations needed by the queue spinlock PV code. Two KVM guests of 20 CPU cores (2 nodes) were created for performance testing in one of the following three configurations: 1) Only 1 VM is active 2) Both VMs are active and they share the same 20 physical CPUs (200% overcommit) The tests run

This patch adds the necessary KVM specific code to allow KVM to support the CPU halting and kicking operations needed by the queue spinlock PV code. Two KVM guests of 20 CPU cores (2 nodes) were created for performance testing in one of the following three configurations: 1) Only 1 VM is active 2) Both VMs are active and they share the same 20 physical CPUs (200% overcommit) The tests run

We have a little soekris box running freebsd that uses racoon for key management. It's used for setting up an ipsec tunnel. I noticed that one of these devices lost the tunnel this morning. I looked in the log and saw this Jul 23 01:37:57 m0n0wall /kernel: pid 80 (racoon), uid 0, was killed: out of swap space I reproduced this problem using this code. #include <stdlib.h> int

Hi list, i have successfully written a solution for memory overcommitment (for my private management software). I can migrate this technology to a standard xen source host. If anyone are interestet, you can send me a email to my private address michael.schmidt =at= xvirt.net _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com

I have a xen server setup that I want to install a lot of vms on if possible. The vms will have no utilization for the most part; and brief utilization when active. The server has 2GB of RAM. We were running into a problem were the dom0 would not let us add anymore vms because we were out of physical memory. I have started to read about memory ballooning and hoping someone could point me

I have been using Xen on a daily basis on a production (but not critical) machine for a number of months now. It''s looking really good. One thing that I have not yet seen anyone mention as a feature that I would really like to see is the ability to overcommit memory. I have 2G of RAM in my machine. I would like to give a developer his own virtual domain to sandbox his application

On Thu, Mar 13, 2014 at 02:16:06PM +0100, Paolo Bonzini wrote: > Il 13/03/2014 11:54, David Vrabel ha scritto: > >On 12/03/14 18:54, Waiman Long wrote: > >>Locking is always an issue in a virtualized environment as the virtual > >>CPU that is waiting on a lock may get scheduled out and hence block > >>any progress in lock acquisition even when the lock has been

On Thu, Mar 13, 2014 at 02:16:06PM +0100, Paolo Bonzini wrote: > Il 13/03/2014 11:54, David Vrabel ha scritto: > >On 12/03/14 18:54, Waiman Long wrote: > >>Locking is always an issue in a virtualized environment as the virtual > >>CPU that is waiting on a lock may get scheduled out and hence block > >>any progress in lock acquisition even when the lock has been

On 12/03/14 18:54, Waiman Long wrote: > Locking is always an issue in a virtualized environment as the virtual > CPU that is waiting on a lock may get scheduled out and hence block > any progress in lock acquisition even when the lock has been freed. > > One solution to this problem is to allow unfair lock in a > para-virtualized environment. In this case, a new lock acquirer

On 12/03/14 18:54, Waiman Long wrote: > Locking is always an issue in a virtualized environment as the virtual > CPU that is waiting on a lock may get scheduled out and hence block > any progress in lock acquisition even when the lock has been freed. > > One solution to this problem is to allow unfair lock in a > para-virtualized environment. In this case, a new lock acquirer

Hello everyone, I´m new to the list and I´m doing some research on all virtualization products and solutions avaiable, and I have two questions about Xen: - Does it use have memory overcommitment techniques (ballooning, TMPS, swapping)? - Does it do software thin provisioning? - I read it has a very strong point when using paravirtualization with Linux systems. Does it have any other kind of

> 2016-08-18 12:39 GMT-04:00 correomm <correomm at gmail.com>: > >> This bug is reported only on the VM's with CentOS 7 running on on VMware >> ESXi 5.1. >> The vSphere performance graph shows high CPU consume and disk activity only >> on VM's with CentOS 7. Sometimes I can not connect remotely with ssh >> (timeout error). >> > I'm

...17.429s 41m19.434s 281m21.238s unfair qspinlock 19m58.315s 40m18.011s 279m27.177s unfair + PV qspinlock 20m0.030s 40m35.011s 278m50.522s With no overcommit, the PV code doesn't really do anything. The unfair lock does provide some performance advantage depending on the workload. In an overcommited PV guest, however, there can be a big performance benefit with PV and unfair lock. In term of spinlock contention, the ordering of the 3 workloads are: kernel build < AIM7 disk xfs < AIM7 disk ext4 With light spinlock contention, the PV ticketlock can be a bit faster than PV qspinlock....