--Apple-Mail=_BA43FE41-733B-497D-BFE0-FAD8F2CAE57A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Hi, this is more for the KVM folks I suppose=85can you get the qemu process = cmdline please? Thanks, michal On 3 Apr 2014, at 12:13, Markus Stockhausen wrote:
Hello, =20 we have an up to date ovirt 3.4 installation. Inside we are running = SLES11 SP3 VMs (Kernel 3.0.76-0.11). After live migration of these VMs they all = of a sudden do not react any longer and CPU usage of the VM goes to 100%. =20 We identified kvm-clock source to be the culprit and therefore = switched to another clocksource. We ended with hpet but are not happy with that as our = inital goal was to use the more simple designed TSC clocksoure.=20 =20 The reason behind that is the question I have for you experts. =20 Our hosts all have the constant_tsc CPU flag available. Just to = mention these are not identical hosts. We have a mix of Xeon 5500 and 5600 machines. = E.G. [root@colovn01 ~]# cat /proc/cpuinfo | grep constant_tsc | wc -l 8 =20 When we start the VM the client sees TSC as available clocksource: =20 colvm53:~ # cat = /sys/devices/system/clocksource/clocksource0/available_clocksource kvm-clock tsc hpet acpi_pm =20 After the first live migration to another host that also has = constant_tsc (see above) that flag is lost inside the VM. =20 colvm53:~ # cat = /sys/devices/system/clocksource/clocksource0/available_clocksource kvm-clock hpet acpi_pm =20 Any ideas? =20 Markus =20 =20 = <InterScan_Disclaimer.txt>_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
--Apple-Mail=_BA43FE41-733B-497D-BFE0-FAD8F2CAE57A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 <html><head><base href=3D"x-msg://1575/"></head><body style=3D"word-wrap: = break-word; -webkit-nbsp-mode: space; -webkit-line-break: = after-white-space; ">Hi,<div>this is more for the KVM folks I = suppose=85can you get the qemu process cmdline = please?</div><div><br></div><div>Thanks,</div><div>michal</div><div><br><d= iv><div>On 3 Apr 2014, at 12:13, Markus Stockhausen wrote:</div><br = class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span = class=3D"Apple-style-span" style=3D"border-collapse: separate; = font-family: Helvetica; font-style: normal; font-variant: normal; = font-weight: normal; letter-spacing: normal; line-height: normal; = orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: = none; white-space: normal; widows: 2; word-spacing: 0px; = -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: = 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: = auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div ocsi=3D"0"= fpstyle=3D"1"><div style=3D"direction: ltr; font-family: Tahoma; color: = rgb(0, 0, 0); font-size: 10pt; ">Hello,<br><br>we have an up to date = ovirt 3.4 installation. Inside we are running SLES11 SP3<br>VMs (Kernel = 3.0.76-0.11). After live migration of these VMs they all of a = sudden<br>do not react any longer and CPU usage of the VM goes to = 100%.<br><br>We identified kvm-clock source to be the culprit and = therefore switched to another<br>clocksource. We ended with hpet but are = not happy with that as our inital goal<br>was to use the more simple = designed TSC clocksoure.<span = class=3D"Apple-converted-space"> </span><br><br>The reason behind = that is the question I have for you experts.<br><br>Our hosts all have = the constant_tsc CPU flag available. Just to mention these<br>are not = identical hosts. We have a mix of Xeon 5500 and 5600 machines. = E.G.<br>[root@colovn01 ~]# cat /proc/cpuinfo | grep constant_tsc | wc = -l<br>8<br><br>When we start the VM the client sees TSC as available = clocksource:<br><br>colvm53:~ # cat = /sys/devices/system/clocksource/clocksource0/available_clocksource<br>kvm-= clock tsc hpet acpi_pm<br><br>After the first live migration to another = host that also has constant_tsc (see above)<br>that flag is lost inside = the VM.<br><br>colvm53:~ # cat = /sys/devices/system/clocksource/clocksource0/available_clocksource<br>kvm-= clock hpet acpi_pm<br><br>Any = ideas?<br><br>Markus<br><br><br></div><span><InterScan_Disclaimer.txt&g= t;</span>_______________________________________________<br>Users = mailing list<br><a = href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br><a = href=3D"http://lists.ovirt.org/mailman/listinfo/users">http://lists.ovirt.= org/mailman/listinfo/users</a></div></span></blockquote></div><br></div></= body></html>= --Apple-Mail=_BA43FE41-733B-497D-BFE0-FAD8F2CAE57A--