[Xen-users] cannot start VM after 100 or so VMs have been started

[xen <vmkernelli@xxxxxxxxxxxx>]

Hi, all:
    Now, I do one test for xen-3.4.0. but met a strange problem

   The test computer is:
   CPU: Inter(R) Core(TM)2 Duo CPU
   Memory: 4G
   Each VM (DomU): 1 vcpu. 16M mem

  For 4G mem, except the Mem for xen use,  if each VM use 16M mem,  I can start almost 200 VMs. because 16M * 200 = almose 3.2 G, There're still have enough mem for xen use

 I start VMs for 0 to 200. But I found any VM cannot be started after 106 VMs have been started.

the error message in /var/log/xen/xend.log is:
[2009-11-26 18:34:17 3366] DEBUG (XendDomain:452) Adding Domain: 106
[2009-11-26 18:34:17 3366] DEBUG (XendDomainInfo:2496) XendDomainInfo.initDomain: 106 256
[2009-11-26 18:34:17 3366] DEBUG (XendDomainInfo:2520) _initDomain:shadow_memory=0x0, memory_static_max=0x1000000, memory_static_min=0x0.
[2009-11-26 18:34:17 3366] DEBUG (balloon:172) Balloon: 4480 KiB free; 0 to scrub; need 17408; retries: 20.
[2009-11-26 18:34:17 3366] DEBUG (balloon:187) Balloon: setting dom0 target to 2316 MiB.
[2009-11-26 18:34:17 3366] DEBUG (XendDomainInfo:1302) Setting memory target of domain Domain-0 (0) to 2316 MiB.
[2009-11-26 18:34:17 3366] DEBUG (balloon:166) Balloon: 17792 KiB free; need 17408; done.
[2009-11-26 18:34:17 3366] INFO (image:173) buildDomain os=linux dom=106 vcpus=1
[2009-11-26 18:34:17 3366] DEBUG (image:661) domid          = 106
[2009-11-26 18:34:17 3366] DEBUG (image:662) memsize        = 16
[2009-11-26 18:34:17 3366] DEBUG (image:663) image          = /tmp/xen-test/mini-os.gz
[2009-11-26 18:34:17 3366] DEBUG (image:664) store_evtchn   = 1
[2009-11-26 18:34:17 3366] DEBUG (image:665) console_evtchn = 2
[2009-11-26 18:34:17 3366] DEBUG (image:666) cmdline        =
[2009-11-26 18:34:17 3366] DEBUG (image:667) ramdisk        =
[2009-11-26 18:34:17 3366] DEBUG (image:668) vcpus          = 1
[2009-11-26 18:34:17 3366] DEBUG (image:669) features       =
[2009-11-26 18:34:17 3366] DEBUG (image:670) flags          = 0
[2009-11-26 18:34:17 3366] ERROR (XendDomainInfo:2578) XendDomainInfo.initDomain: exception occurred
Traceback (most recent call last):
  File "usr/lib/python2.6/site-

packages/xen/xend/XendDomainInfo.py", line 2551, in _initDomain
    channel_details = self.image.createImage()
  File "usr/lib/python2.6/site-packages/xen/xend/image.py", line 156, in createImage
    return self.createDomain()
  File "usr/lib/python2.6/site-packages/xen/xend/image.py", line 175, in createDomain
    result = self.buildDomain()
  File "usr/lib/python2.6/site-packages/xen/xend/image.py", line 979, in buildDomain
    rc = LinuxImageHandler.buildDomain(self)
  File "usr/lib/python2.6/site-packages/xen/xend/image.py", line 683, in buildDomain
    vhpt           = self.vhpt)
Error: (1, 'Internal error', 'launch_vm: SETVCPUCONTEXT failed (rc=-1)\n')
[2009-11-26 18:34:17 3366] ERROR (XendDomainInfo:476) VM start failed

 
If I destroy one VM, I can start it or another VM successfully. But the total num of VMs are almost 106.

Could anyone give me some hints? 
Many thanks! 

---

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