[CentOS-virt] Masking CPU flags via libvirt xml not working?

Hi, Has anyone here managed to get cpu masking working via libvirt? Intention to enable VM migrations between hosts of a different CPU generation. Inside my xml I'm providing the model as well as a list of features to specifically disable, but none of it seems to take any effect. On booting

Re: [CentOS-virt] Masking CPU flags via libvirt xml not working?

On 8/26/2014 4:52 PM, Nathan March wrote: Has anyone here managed to get cpu masking working via libvirt? Intention to enable VM migrations between hosts of a different CPU generation. To add to this, I've tried using the boot options to set the cpu mask instead: xen_commandline

Re: [CentOS-virt] Can't block-attach a file on a read only volume?

http://cbs.centos.org/kojifiles/work/tasks/8801/8801/ If you could test those and let me know if it fixes your problem, I'd appreciate it. :-) Confirmed, both issues are fixed. Thanks! Any plans to push those packages to main mirrors? - Nathan

[CentOS-virt] Tapdisk processes being left behind when hvm domu's migrate/shutdown

Hi All, I'm seeing tapdisk processes not being terminated after a HVM vm is shutdown or migrated away. I don't see this problem with linux paravirt domu's, just windows hvm ones. xl.cfg: name = 'nathanwin' memory = 4096 vcpus = 2 disk = [

Re: [CentOS-virt] CentOS Images on AWS with partitions on /dev/xvda1 are awkwared to resize

So you're working from the command line tools in the EPEL 'cloud-init' package, not the AWS GUI? Because when I tried expanding the size of the base disk image in the GUI, I wound up with an an 8 Gig default /dev/xvda1 on a 20 Gig /dev/xvda. That's why I was looking at how do I resize

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

Hi All, Some more data on this, I've reproduced this on another host that's a completely stock centos/xen deployment with a centos 6.6 domU. Since I’m seeing the retransmissions on the VIF, I don't think it's related to the network stack but just in case.. Each host is connected via LACP with

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

that originally lead me down this path. - Nathan -Original Message- From: centos-virt-boun...@centos.org [mailto:centos-virt- boun...@centos.org] On Behalf Of Nathan March Sent: Wednesday, April 15, 2015 1:13 PM To: 'Discussion about the virtualization on CentOS' Subject: Re: [CentOS-virt

Re: [CentOS-virt] Seeing dropped packets / tcp retrans on latest 4.4.1-10el6

Hi All, I've tracked this down... We do rate limiting of our vms with a mix of ebtables/tc. Running these commands (replace vif1.0 with the correct vif for your VM) will reproduce this: ebtables -A FORWARD -i vif1.0 -j mark --set-mark 990 --mark-target CONTINUE tc qdisc add dev bond0 root

[CentOS-virt] Timezone issues with migrations between host kernel 3.10 and 3.18

Hi All, I'm seeing clock issues with live migrations on the latest kernel packages, migrating a VM from 3.10.68-11 to 3.18.17-13 results in the VM clock being off by 7 hours (I'm PST, so appears to be a timezone issue). This is also between xen versions, but rolling the target back to 3.10

Re: [CentOS-virt] Timezone issues with migrations between host kernel 3.10 and 3.18

On 07/30/2015 06:38 AM, Johnny Hughes wrote: On 07/29/2015 11:38 AM, Nathan March wrote: Hi All, I'm seeing clock issues with live migrations on the latest kernel packages, migrating a VM from 3.10.68-11 to 3.18.17-13 results in the VM clock being off by 7 hours (I'm PST, so

Re: [CentOS-virt] Xen Doc Day: Guide to setting up bridging on CentOS 6 / 7

If you'd like to extend that a little bit, here's example configs on how to do LACP and vlan tagging on c6: host network-scripts # cat ifcfg-eth0 DEVICE=eth0 ONBOOT=yes USEERCTL=no BOOTPROTO=none IPV6INIT=no MTU=1500 MASTER=bond0 SLAVE=yes host network-scripts # cat ifcfg-eth1 DEVICE=eth1

Re: [CentOS-virt] Major stability problems with xen 4.6.6

> It seems the patch you mentioned was merged to upstream Linux here: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i > d=71472fa9c52b1da27663c275d416d8654b905f05 > > and then reverted/removed here: >

Re: [CentOS-virt] Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes

> > I have no issues rolling this patch in , while we wait on upstream, if > > it makes our tree more stable. > > > > I think we should do that.. What do others think? > I've had the patch deployed to a group of 32 hosts (with hundreds of vms) for about 10 days now and no sign of any issues.

[CentOS-virt] Major stability problems with xen 4.6.6

Hi, I'm seeing numerous crashes on the xen 4.6.6-1 / 4.6.6-2 releases, on both the 4.9.34-29 and 4.9.39-29 kernels. I've attached a txt with two different servers outputs. Xen-028: This crashed this morning while running 4.6.6-1 and 4.9.39-29 Xen-001: This crashed shortly after being

Re: [CentOS-virt] Major stability problems with xen 4.6.6

would almost always cause the oops. Cheers, Nathan From: CentOS-virt [mailto:centos-virt-boun...@centos.org] On Behalf Of Nathan March Sent: Wednesday, August 23, 2017 3:32 PM To: 'Discussion about the virtualization on CentOS' <centos-virt@centos.org> Subject: Re: [CentOS-virt]

[CentOS-virt] Xen packages with XSA-226+?

Hi, It's been almost a week now since XSA-226 through XSA-230 were released and just wondering when updated packages are expected to be posted? https://cbs.centos.org/koji/packageinfo?packageID=88 has nothing for the past month. Thanks! - Nathan ___

[CentOS-virt] Stability issues since moving to 4.6 - Kernel paging request bug + VM left in null state

Since moving from 4.4 to 4.6, I've been seeing an increasing number of stability issues on our hypervisors. I'm not clear if there's a singular root cause here, or if I'm dealing with multiple bugs. One of the more common ones I've seen, is a VM on shutdown will remain in the null state and a

Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI meltdown mitigation) packages making their way to centos-virt-xen-testing

> -Original Message- > From: CentOS-virt [mailto:centos-virt-boun...@centos.org] On Behalf Of > Peter Peltonen > Sent: Thursday, January 18, 2018 11:19 AM > To: Discussion about the virtualization on CentOS > Subject: Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI

Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI meltdown mitigation) packages making their way to centos-virt-xen-testing

ages making their way to centos-virt-xen-testing > > On 01/24/2018 01:01 AM, Pasi Kärkkäinen wrote: > > On Tue, Jan 23, 2018 at 06:20:39PM -0600, Kevin Stange wrote: > >> On 01/23/2018 05:57 PM, Karl Johnson wrote: > >>> > >>> > >>> On Tue, Ja

Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI meltdown mitigation) packages making their way to centos-virt-xen-testing

Just a heads up that I'm seeing major stability problems on these builds. Didn't have console capture setup unfortunately, but have seen my test hypervisor hard lock twice over the weekend. This is with xpti being used, rather than the shim. Cheers, Nathan > -Original Message- > From:

Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI meltdown mitigation) packages making their way to centos-virt-xen-testing

> Thanks for the heads-up. It's been running through XenServer's tests > as well as the XenProject's "osstest" -- I haven't heard of any > additional issues, but I'll ask. Looks like I can reproduce this pretty easily, this happened upon ssh'ing into the server while I had a VM migrating into

Re: [CentOS-virt] Xen 4.6.6-9 (with XPTI meltdown mitigation) packages making their way to centos-virt-xen-testing

Hi, > Hmm.. isn't this the ldisc bug that was discussed a few months ago on this list, > and a patch was applied to virt-sig kernel aswell? > > Call trace looks similar.. Good memory! I'd forgotten about that despite being the one who ran into it. Looks like that patch was just removed in