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On Wed, Feb 15, 2017 at 10:27:46AM +0100, Michal Privoznik wrote: > On 02/15/2017 03:43 AM, Blair Bethwaite wrote: > > On 15 February 2017 at 00:57, Daniel P. Berrange <berrange@redhat.com> wrote: > >> What is the actual error you're getting during startup. > > > > # virsh -d0 start instance-0000037c > > start: domain(optdata): instance-0000037c > > star...

Hi all, In IRC last night Dan helpfully confirmed my analysis of an issue we are seeing attempting to launch high memory KVM guests backed by hugepages... In this case the guests have 240GB of memory allocated from two host NUMA nodes to two guest NUMA nodes. The trouble is that allocating the hugepage backed qemu process seems to take longer than the 30s QEMU_JOB_WAIT_TIME and so libvirt then

On 15 February 2017 at 00:57, Daniel P. Berrange <berrange@redhat.com> wrote: > What is the actual error you're getting during startup. # virsh -d0 start instance-0000037c start: domain(optdata): instance-0000037c start: found option <domain>: instance-0000037c start: <domain> trying as domain NAME error: Failed to start domain instance-0000037c error: monitor socket did

On Tue, Feb 14, 2017 at 06:13:20PM +1100, Blair Bethwaite wrote: > Hi all, > > In IRC last night Dan helpfully confirmed my analysis of an issue we are > seeing attempting to launch high memory KVM guests backed by hugepages... > > In this case the guests have 240GB of memory allocated from two host NUMA > nodes to two guest NUMA n...

On Tue, Nov 14, 2017 at 10:52:03AM -0700, Blair Bethwaite wrote: > Thanks for the reply Daniel, > > However I think you slightly misunderstood the scenario... > > On 14 November 2017 at 10:32, Daniel P. Berrange <berrange@redhat.com> wrote: > > IOW, if your application has a certain expectation of performance that can only &g...

On 14 November 2017 at 10:56, Daniel P. Berrange <berrange@redhat.com> wrote: > Oh well THP usage inside the guest is then not really anything todo with > virt, just a regular Linux questions, so not sure libvirt is the best > place to ask. True, I just hoped you or one of the other devs might have some insight on reclaim behaviour that would provide a clue. I guess I'll try a

On 02/15/2017 03:43 AM, Blair Bethwaite wrote: > On 15 February 2017 at 00:57, Daniel P. Berrange <berrange@redhat.com> wrote: >> What is the actual error you're getting during startup. > > # virsh -d0 start instance-0000037c > start: domain(optdata): instance-0000037c > start: found option <domain>...

On Tue, Nov 14, 2017 at 10:23:56AM -0700, Blair Bethwaite wrote: > Hi all, > > This is not really a libvirt issue but I'm hoping some of the smart folks > here will know more about this problem... > > We have noticed when running some HPC applications on our OpenStack > (libvirt+KVM) cloud that the same application occasionally...

On 15 February 2017 at 20:40, Daniel P. Berrange <berrange@redhat.com> wrote: > On Wed, Feb 15, 2017 at 10:27:46AM +0100, Michal Privoznik wrote: >> On 02/15/2017 03:43 AM, Blair Bethwaite wrote: >> > On 15 February 2017 at 00:57, Daniel P. Berrange <berrange@redhat.com> wrote: >> >> What is the actual error you're getting during startup. >> > >> > # virsh -d0 start instance-0000037c >> > start: domain(optdata): instance-0000...

Thanks for the reply Daniel, However I think you slightly misunderstood the scenario... On 14 November 2017 at 10:32, Daniel P. Berrange <berrange@redhat.com> wrote: > IOW, if your application has a certain expectation of performance that can only > be satisfied by having the KVM guest backed by huge pages, then you should > really change to explicitly reserve huge pages for the

On 12/06/2016 06:06 AM, Blair Bethwaite wrote: > Hi Roberto, Hi Blair > What is the cpu and memory configuration of your guest? I've set to copy host configuration (16 cores) and memory is set to 24GB, host has 64GB. Guest is Windows 2012 64bits version Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit B...

Hi all, This is not really a libvirt issue but I'm hoping some of the smart folks here will know more about this problem... We have noticed when running some HPC applications on our OpenStack (libvirt+KVM) cloud that the same application occasionally performs much worse (4-5x slowdown) than normal. We can reproduce this quite easily by filling pagecache (i.e. dd-ing a single large file to

Hi There, I've moved some Windows2012 with MSSQL VMs from an hold ESXi 5.5 machine to a more recent and powerful machine running Fedora 24 x86_64 and related libvirt + KVM virtualization. I've moved the VMs filesystem to LVM slices and installed the VirtIO drivers in to all Windows VMs. I've also set both Disk and Network interface to work using VirtIO. So far so good everything works

Hi Roberto, What is the cpu and memory configuration of your guest? Are you pinning to dedicated CPUs, are you exposing host topology and cpu features, do you have dedicated I/O threads? Are you backing the guest memory with hugepages? All of the above will likely increase performance and minimise noise. Cheers, On 6 December 2016 at 05:13, Roberto Fichera <kernel at tekno-soft.it> wrote: