[Xen-users] DomU max memory problem

[Pavel Krejca <krejca@xxxxxxxxxx>]

Hi,

when trying to run new domain under xen-3.2.1 with more than 127 MB 
memory set in config file, I get this error message:
"Error: memory_dynamic_max must be less than or equal to memory_static_max"

128 MB is probably default value for domu. I tried to raise it by 
"maxmem" option in guest config, but with same result (seems that maxmem 
keyword is ignored by xend). I also tried to increase mem limits with 
"xm mem-max" and "xm mem-set" on running domain, but it has no effect 
unless domain is restarted. But after reboot, I get the same error message.
Last thing I tried was to hardcode higher default memory limit in 
XendConfig.py (and compiled it to .pyc) but it had no effect too.
So my question is, how can I start guest domain with memory set to more 
than 128 MB? I suspect this value to be saved somewhere in xend cache, 
but I can't find it. Why does Balloon driver think that only 131064 KiB 
is free? Thanks for answer. My configuration follows:
[xen]# cat /etc/xen/auto/testdomain.cfg
kernel = "/boot/vmlinuz-xenU"
cpus = "^0"
maxmem = 512
memory = 256
name = "test_domain"
vif = ['ip=192.168.0.2,bridge=eth0']
disk = ['phy:sdb1,sda1,w','phy:sdb2,sda2,w']
root = "/dev/sda1 ro"

[xen]# tail /var/log/xen/xend.log
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:84) 
XendDomainInfo.create(['vm', ['name', 'test_domain'], ['memory', 256], 
['maxmem', 512], ['vcpus', 1], ['on_xend_start', 'ignore'], 
['on_xend_stop', 'ignore'], ['cpus', '^0'], ['image', ['linux', 
['kernel', '/boot/vmlinuz-xenU'], ['root', '/dev/sda1 ro']]], ['device', 
['vbd', ['uname', 'phy:sdb1'], ['dev', 'sda1'], ['mode', 'w']]], 
['device', ['vbd', ['uname', 'phy:sdb2'], ['dev', 'sda2'], ['mode', 
'w']]], ['device', ['vif', ['ip', '192.168.0.2'], ['bridge', 'eth0']]]])
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1618) 
XendDomainInfo.constructDomain
[2008-09-12 15:03:46 11411] DEBUG (balloon:132) Balloon: 131072 KiB 
free; need 2048; done.
[2008-09-12 15:03:46 11411] DEBUG (XendDomain:443) Adding Domain: 6
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1703) 
XendDomainInfo.initDomain: 6 256
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1738) 
_initDomain:shadow_memory=0x0, memory_static_max=0x20000000, 
memory_static_min=0x0.
[2008-09-12 15:03:46 11411] DEBUG (balloon:138) Balloon: 131064 KiB 
free; 0 to scrub; need 262144; retries: 20.
[2008-09-12 15:03:46 11411] DEBUG (balloon:153) Balloon: setting dom0 
target to 3744 MiB.
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:693) Setting memory 
target of domain Domain-0 (0) to 3744 MiB.
[2008-09-12 15:03:46 11411] ERROR (XendDomainInfo:1775) 
XendDomainInfo.initDomain: exception occurred
Traceback (most recent call last):
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 1747, in _initDomain
   balloon.free(memory + shadow)
 File "usr/lib64/python2.5/site-packages/xen/xend/balloon.py", line 
154, in free
   dom0.setMemoryTarget(new_alloc_mb)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 697, in setMemoryTarget
   self._safe_set_memory('memory_dynamic_max', target * MiB)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 2362, in _safe_set_memory
   self.info._memory_sanity_check()
 File "usr/lib64/python2.5/site-packages/xen/xend/XendConfig.py", line 
366, in _memory_sanity_check
   raise XendConfigError("memory_dynamic_max must be less " \
XendConfigError: Invalid Configuration: memory_dynamic_max must be less 
than or equal to memory_static_max
[2008-09-12 15:03:46 11411] ERROR (XendDomainInfo:440) VM start failed
Traceback (most recent call last):
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 420, in start
   XendTask.log_progress(31, 60, self._initDomain)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendTask.py", line 
209, in log_progress
   retval = func(*args, **kwds)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 1778, in _initDomain
   raise exn
XendConfigError: Invalid Configuration: memory_dynamic_max must be less 
than or equal to memory_static_max
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1897) 
XendDomainInfo.destroy: domid=6
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1914) 
XendDomainInfo.destroyDomain(6)
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1529) Destroying 
device model
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1536) Releasing devices
[2008-09-12 15:03:46 11411] ERROR (XendDomainInfo:89) Domain 
construction failed
Traceback (most recent call last):
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 87, in create
   vm.start()
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 420, in start
   XendTask.log_progress(31, 60, self._initDomain)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendTask.py", line 
209, in log_progress
   retval = func(*args, **kwds)
 File "usr/lib64/python2.5/site-packages/xen/xend/XendDomainInfo.py", 
line 1778, in _initDomain
   raise exn
XendConfigError: Invalid Configuration: memory_dynamic_max must be less 
than or equal to memory_static_max
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1897) 
XendDomainInfo.destroy: domid=None
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1914) 
XendDomainInfo.destroyDomain(None)
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1534) No device model
[2008-09-12 15:03:46 11411] DEBUG (XendDomainInfo:1536) Releasing devices

[xen]# xm list
Name                                        ID   Mem VCPUs      State   
Time(s)
Domain-0                                    0   512     1     r-----    
258.9
test_domain                               1   127     1     -b----    220.8

[xen]# free -m
                  total       used       free     shared    buffers     
cached
Mem:          3872        372       3500          0         88         55
-/+ buffers/cache:        227       3644

[xen]# uname -a
Linux xen 2.6.21-xen #3 SMP Fri Sep 5 17:22:35 CEST 2008 x86_64 Intel(R) 
Xeon(R) CPU E5420 @ 2.50GHz GenuineIntel GNU/Linux

Pavel

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