Re: [CentOS-virt] performance differences between kvm/xen
Hi Grant, On Wed, Oct 27, 2010 at 11:00 AM, Grant McWilliams wrote: > Todd, I think there's more than one way to look at this as well. As Xen > becomes more of a product and less of an installable package > it will probably have to be profiled as a product. The XCP devs hope that XCP will eventually be available via a package install (for example something similar to yum install xcp). > Say benchmark XCP on > particular hardware and benchmark RHEL KVM on the same hardware and ESX as > well. > It makes sense to benchmark a XEN kernel and a KVM kernel if we have that > flexibility but that's starting to shrink. Another test that I don't think > is THAT important anymore is tesing Xen with and without pvops kernels. > There were some rumors going around that the old 2.6.18 kernel was faster > than the new pvops. I was going to put together tests and never got to it. > Not that it makes any difference in the future because the old kernel is > fast going > away. > Yeah the old one is going away, comparing the forward port kernel (for example from OpenSUSE) to the new pv_ops one is what we will want to do. The pv_ops one may be better or worse under certain loads, but unless we test, how will we know? Once we can demonstrate it, the pv_ops kernel can be improved as needed too. > What I'd like to have is a standardized test with a way of multiple people > uploading it and comparing results so we can run it on as many systems as > possible. > Data correlation could then be done on the data. Currently we have one test > over here and another over there and the tests never seem to be updated or > even > run again to verify results. Maybe none of it matters as the hypervisor > becomes inconsequential. > Great, yes that is what research at Clarkson University tried to do. As far as I know no one at Clarkson is actively working on it though. I will check with them when I get a chance though. > I'm going to look at the tests you've done as soon as time permits. What we completed were some basic things. There is still more to test. Thanks, Todd -- Todd Deshane http://todddeshane.net http://runningxen.com ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] Xen on Centos 5.5 vs 5.3 and stability issues
On Thu, Oct 28, 2010 at 01:56:33PM +1300, Steven Ellis wrote: >I've recently upgraded a Centos 5.3 machine to Centos 5.5. The hardware >isn't HVM capabile so I'm only running para-virt guests. > >Using a vanilla i386 kernel boots without, but the newer kernel-xen locks >up the Dom0 after a couple of minute. I'm only booting into single user >mode for these tests so no VMs are active. > > * kernel-xen-2.6.18-128.1.10.el5 - no issues > * kernel-xen-2.6.18-194.17.4.el5 - lock up > * kernel-2.6.18-194.17.4.el5 - no issues > >For the moment I've switched back to the older Xen kernel, athough I'm >still running the newer Xen Hypervisor. > Please set up a serial console and capture the full error/crash messages and post the log here. Examples here: http://wiki.xensource.com/xenwiki/XenSerialConsole -- Pasi >My current Xen packages are > > * xen-3.0.3-105.el5_5.5 > * kernel-xen-2.6.18-194.17.4.el5 > * kernel-xen-2.6.18-128.1.10.el5 > * kmod-xfs-xen-0.4-2 > * xen-libs-3.0.3-105.el5_5.5 > * kernel-xen-devel-2.6.18-194.17.4.el5 > * kernel-xen-devel-2.6.18-128.1.10.el5 > * xen-devel-3.0.3-105.el5_5.5 > >Prior to the upgrade I had the following installed under Centos 5.3 > > * kernel-xen-devel-2.6.18-128.1.6.el5 > * kernel-xen-2.6.18-128.1.10.el5 > * xen-libs-3.0.3-80.el5_3.2 > * xen-devel-3.0.3-80.el5_3.2 > * kmod-xfs-xen-0.4-2 > * kernel-xen-2.6.18-128.1.6.el5 > * kernel-xen-devel-2.6.18-128.1.10.el5 > * xen-3.0.3-80.el5_3.2 > >Booting Dom0 with kernel-xen-2.6.18-128.1.10.el5 everything appears to >work normally and all of my Guests are up and running. > >If I boot with kernel-xen-2.6.18-194.17.4.el5 the boot normally gets to >around udev and the system locks up. On a couple of occasions it did mange >to boot but reported some files were corrupted. I'm worried that there is >an issue running this kernel where the root file system is LVM on top of >Raid 1. > >Anyone on this list have tips on diagnosing the issue, or come across a >similar problem themselves. > >Steve > > > > > ___ > CentOS-virt mailing list > CentOS-virt@centos.org > http://lists.centos.org/mailman/listinfo/centos-virt ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] Xen on Centos 5.5 vs 5.3 and stability issues
Do you use sata drives? Does your system support AHCI, and is that enabled in the bios? ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] VMWare 4.1 and CentOS
> > > On Sun, 24 Oct 2010 23:47:09 +0200, Alexander Dalloz > wrote: >> Am 24.10.2010 23:03, schrieb Drew Kollasch: >> >>> Is there any known issues when trying to run CentOS (x86 or x64) on a >> fresh >>> install of vmware 4.1? >>> >>> Details as to why I am asking are here in the CentOS forums: >>> >> > https://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&order=DESC&topic_id=28521&forum=39 >>> >>> Thanks! >>> -Drew >> >> >> https://access.redhat.com/kb/docs/DOC-38013 >> >> should nail this. > > That only relates to running as a virtual guest on top of Xen. No mention > of VMWare. > > Steve You are correct, that this knowledge base article only mentions Xen as the hypervisor. Though the OP gets exactly the documented kernel panic and call trace signature. So it is very likely that he is running into this. Regards Alexander ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
