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Hi,

We are seeing this error in xl create. We have 132GB ram in the host and dom0 memory is restricted to 8GB in the kernel boot parameter because rsync of 4gb files takes longer.

What should be the ideal settings so that we don't get this error?

xc: detail: Failed allocation for dom 2: 2048 extents of order 0

xc: error: Could not allocate memory for HVM guest. (16 = Device or resource busy): Internal error

libxl: error: libxl_dom.c:656:libxl__build_hvm: hvm building failed

libxl: error: libxl_create.c:919:domcreate_rebuild_done: cannot (re-)build domain: -3

We are using Xen 4.2.4

lc-1:~ # uname -a

Linux ssc-lc-1 3.0.101-0.15-xen #1 SMP Wed Jan 22 15:49:03 UTC 2014 (5c01f4e) x86_64 x86_64 x86_64 GNU/Linux

lc-1:~ # xentop

xentop - 13:54:04 Xen 4.2.4_02-0.7.1

According to http://wiki.xenproject.org/wiki/Tuning_Xen_for_Performance, it says we should set dom0 memory to 4GB?

What can we resolve this problem?

Thanks,

/Saurabh

lc-1:~ # xl list

Name ID Mem VCPUs State Time(s)

Domain-0 0 8151 4 r----- 1681.3

pvm-01-1 1 8187 4 -b---- 256.4

pool1-slot1 2 98299 32 -b---- 81.6

lc-1:~ # grep dom0 /boot/efi/efi/SuSE/xen.cfg

options=crashkernel=256M@16M console=com1 com1=115200 dom0_mem=8192m iommu=1,sharept extra_guest_irqs=80 dom0_max_vcpus=4 dom0_vcpus_pin no-bootscrub

-------------xl create start Sat Mar 29 13:59:49 UTC 2014--------------------

WARNING: ignoring "kernel" directive for HVM guest. Use "firmware_override" instead if you really want a non-default firmware

WARNING: ignoring device_model directive.

WARNING: Use "device_model_override" instead if you really want a non-default device_model

libxl: debug: libxl_create.c:1192:do_domain_create: ao 0x625390: create: how=(nil) callback=(nil) poller=0x624850

libxl: debug: libxl_device.c:245:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=unknown

libxl: debug: libxl_device.c:191:disk_try_backend: Disk vdev=hda, backend phy unsuitable as phys path not a block device

libxl: debug: libxl_device.c:281:libxl__device_disk_set_backend: Disk vdev=hda, using backend tap

libxl: debug: libxl_create.c:694:initiate_domain_create: running bootloader

libxl: debug: libxl_bootloader.c:321:libxl__bootloader_run: not a PV domain, skipping bootloader

libxl: debug: libxl_event.c:607:libxl__ev_xswatch_deregister: watch w=0x625920: deregister unregistered

xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0x9cc04

xc: detail: elf_parse_binary: memory: 0x100000 -> 0x19cc04

xc: info: VIRTUAL MEMORY ARRANGEMENT:

Loader: 0000000000100000->000000000019cc04

Modules: 0000000000000000->0000000000000000

TOTAL: 0000000000000000->00000017ff800000

ENTRY ADDRESS: 0000000000100000

xc: detail: Failed allocation for dom 2: 2048 extents of order 0

xc: error: Could not allocate memory for HVM guest. (16 = Device or resource busy): Internal error

libxl: error: libxl_dom.c:656:libxl__build_hvm: hvm building failed

libxl: error: libxl_create.c:919:domcreate_rebuild_done: cannot (re-)build domain: -3

libxl: error: libxl_dm.c:1262:libxl__destroy_device_model: could not find device-model's pid for dom 2

libxl: error: libxl.c:1419:libxl__destroy_domid: libxl__destroy_device_model failed for 2

libxl: debug: libxl_event.c:1568:libxl__ao_complete: ao 0x625390: complete, rc=-3

libxl: debug: libxl_create.c:1205:do_domain_create: ao 0x625390: inprogress: poller=0x624850, flags=ic

libxl: debug: libxl_event.c:1540:libxl__ao__destroy: ao 0x625390: destroy

xc: debug: hypercall buffer: total allocations:18274 total releases:18274

xc: debug: hypercall buffer: current allocations:0 maximum allocations:2

xc: debug: hypercall buffer: cache current size:2

xc: debug: hypercall buffer: cache hits:18263 misses:2 toobig:9

Parsing config from /root/vmmgr/hvmmgr/.hvmmgrd/vms/pool1-vm6.cfg

-------------xl create end--------------------

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