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[Xen-users] Re: xm mem-set Domain-0 box went poof

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Re: xm mem-set Domain-0 box went poof
From: Brandon Lamb <brandonlamb@xxxxxxxxx>
Date: Sun, 14 Mar 2010 02:21:14 -0800
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On Sun, Mar 14, 2010 at 2:03 AM, Brandon Lamb <brandonlamb@xxxxxxxxx> wrote:
> On Sun, Mar 14, 2010 at 1:49 AM, Brandon Lamb <brandonlamb@xxxxxxxxx> wrote:
>> On a fresh reboot
>>
>> free:
>>       total   used    free shared buffers cached
>> Mem: 3371340 448156 2923184      0    5328  77840
>>
>> ----------
>>
>> top:
>> Mem:   3371340k total,   449044k used,  2922296k free,     5344k buffers
>>
>> ----------
>>
>> xentop - 01:44:00   Xen 3.4.3-rc4-pre
>> 1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
>> Mem: 4160828k total, 4022996k used, 137832k free    CPUs: 4 @ 2308MHz
>>      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k)
>> MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR
>> SSID
>>  Domain-0 -----r        109    2.2    3965032   95.3   no limit       n/a    
>>  4
>>
>> ----------
>>
>> xm mem-set Domain-0 512
>>
>> xentop showed ~1G memory (26% memory), then right after this i tried
>>
>> xm mem-set Domain-0 192
>>
>> ... box died with caps and scroll lock flashing.
>>
>> I had dom0_mem=512, dom0-min-mem=192
>>
>> xen-3.4-testing-hg and xen/master kernel from jeremy's git repo
>
> Rebooted, this time did xm mem-set Domain-0 448, no crashes.
>
> xentop - 01:58:54   Xen 3.4.3-rc4-pre
> 1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
> Mem: 4160828k total, 1113620k used, 3047208k free    CPUs: 4 @ 2308MHz
>      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k)
> MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR
> SSID
>  Domain-0 -----r        123    1.8    1055656   25.4   no limit
> n/a     4    0        0        0    0        0        0        0    0
>
> So this look to me like I *should* have 3 gigs free, why its still
> saying that its using 1gig is beyond me. Anyhow, now I try to start my
> guest...
>
> xen1:/etc/xen# xm create syslog.cfg
> Using config file "./syslog.cfg".
> Error: (4, 'Out of memory', 'xc_dom_alloc_segment: segment ramdisk too
> large (0xef4f > 0x10000 - 0x26e0 pages)\n')
>
> xen1:/etc/xen# cat syslog.cfg
> kernel      = '/boot/vmlinuz-2.6.31.12'
> ramdisk     = '/boot/initrd.img-2.6.31.12'
> memory      = '256'
> #maxmem         = '384'
> root        = '/dev/xvda ro'
> disk        = ['phy:/dev/volumes/syslog,xvda,w']
> name        = 'syslog'
> vcpus           = 1
> vif         = [ 'ip=208.200.248.121, mac=00:16:3E:36:9C:15,
> bridge=xenbr0, model=e1000' ]
> vfb                     = ['vnc=1, vnclisten=0.0.0.0, vncunused=1']
> serial          = 'pty'
> on_poweroff = 'destroy'
> on_reboot   = 'restart'
> on_crash    = 'restart'
>
> /dev/volumes/syslog is on lvm.
>
> I dont get it, I had this working fine on another box argh. The last
> thing I just did was remove all /boot files related to xen, dom0
> kernel etc, did make uninstall in xen-testing and then copied over
> tarballs of my working install, then ran the make install and copied
> my xend-config over. Why does this hate me so

Wow well just had a WTH moment. For s&g I set memory=512 in my
syslog.cfg... and it STARTED!

No more Error: (4, 'Out of memory', 'xc_dom_alloc_segment: segment
ramdisk too large (0xef4f > 0x10000 - 0x26e0 pages)\n')

I am totally scratching my head... must be something going on that i
dont know about

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