RE: Issue with launching instance with OVS-DPDK

29 Jan 2019

      Answers <DL> in-line </DL>

Thanks

David

-----Original Message-----
From: Sean Mooney <smooney@redhat.com> 
Sent: 29 January 2019 14:55
To: Lake, David (PG/R - Elec Electronic Eng) <d.lake@surrey.ac.uk>; openstack-dev@lists.openstack.org
Cc: Ge, Chang Dr (Elec Electronic Eng) <c.ge@surrey.ac.uk>
Subject: Re: Issue with launching instance with OVS-DPDK

On Mon, 2019-01-28 at 13:17 +0000, David Lake wrote:
...
Hello
I’ve built an Openstack all-in-one using OVS-DPDK via Devstack.
I can launch instances which use the “m1.small” flavour (which I have 
modified to include the hw:mem_size large as per the DPDK instructions) but as soon as I try to launch anything more than m1.small, I get this error:
Jan 28 12:56:52 localhost nova-conductor: #033[01;31mERROR 
nova.scheduler.utils [#033[01;36mNone req-917cd3b9-8ce6-
41af-8d44-045002512c91 #033[00;36madmin admin#033[01;31m] 
#033[01;35m[instance: 25cfee28-08e9-419c-afdb-4d0fe515fb2a]
#033[01;31mError from last host: localhost (node localhost): [u'Traceback (most recent call last):\n', u'  File
"/opt/stack/nova/nova/compute/manager.py", line 1935, in _do_build_and_run_instance\n    filter_properties,
request_spec)\n', u'  File "/opt/stack/nova/nova/compute/manager.py", line 2215, in _build_and_run_instance\n   
instance_uuid=instance.uuid, reason=six.text_type(e))\n', 
u'RescheduledException: Build of instance 25cfee28-08e9- 
419c-afdb-4d0fe515fb2a was re-scheduled: internal error: qemu 
unexpectedly closed the monitor: 2019-01- 28T12:56:48.127594Z 
qemu-kvm: -chardev 
socket,id=charnet0,path=/var/run/openvswitch/vhu46b3c508-f8,server: 
info: QEMU waiting for connection on: 
disconnected:unix:/var/run/openvswitch/vhu46b3c508-f8,server\n2019-01-
28T12:56:49.251071Z
qemu-kvm: -object 
memory-backend-file,id=ram-node0,prealloc=yes,mem-path=/dev/hugepages/
libvirt/qemu/4-instance-
00000005,share=yes,size=4294967296,host-nodes=0,policy=bind: 
os_mem_prealloc: Insufficient free host memory pages available to 
allocate guest RAM\n']#033[00m#033[00m
My Hypervisor is reporting 510.7GB of RAM and 61 vCPUs.
how much of that ram did you allocate as hugepages.
<DL> OVS_NUM_HUGEPAGES=3072 </DL>

can you provide the output of cat /proc/meminfo

<DL>

MemTotal:       526779552 kB
MemFree:        466555316 kB
MemAvailable:   487218548 kB
Buffers:            2308 kB
Cached:         22962972 kB
SwapCached:            0 kB
Active:         29493384 kB
Inactive:       13344640 kB
Active(anon):   20826364 kB
Inactive(anon):   522012 kB
Active(file):    8667020 kB
Inactive(file): 12822628 kB
Unevictable:       43636 kB
Mlocked:           47732 kB
SwapTotal:       4194300 kB
SwapFree:        4194300 kB
Dirty:                20 kB
Writeback:             0 kB
AnonPages:      19933028 kB
Mapped:           171680 kB
Shmem:           1450564 kB
Slab:            1224444 kB
SReclaimable:     827696 kB
SUnreclaim:       396748 kB
KernelStack:       69392 kB
PageTables:       181020 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    261292620 kB
Committed_AS:   84420252 kB
VmallocTotal:   34359738367 kB
VmallocUsed:     1352128 kB
VmallocChunk:   34154915836 kB
HardwareCorrupted:     0 kB
AnonHugePages:   5365760 kB
CmaTotal:              0 kB
CmaFree:               0 kB
HugePages_Total:    6144
HugePages_Free:     2048
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      746304 kB
DirectMap2M:    34580480 kB
DirectMap1G:    502267904 kB
[stack@localhost devstack]$

</DL>
...
Build is the latest git clone of Devstack.
Thanks
David