Re: [Xen-devel] can not use all available memory

[Alexander Bienzeisler <chosi@xxxxxxxxx>]

I am currently using Xen 4.2.1-pre built from git source. Kernel version 
3.1.1
xl info before:

host                   : susi-0
release                : 3.1.1-xen
version                : #1 SMP Fri Nov 18 10:16:22 CET 2011
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 31
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 3325
hw_caps                : 
bfebfbff:2c100800:00000000:00003f40:029ee3ff:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 98291
free_memory            : 28969
sharing_freed_memory   : 0
sharing_used_memory    : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 2
xen_extra              : .1-pre
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Wed Nov 14 11:46:07 2012 +0000 25922:8ca6372315f8
xen_commandline        : placeholder loglvl=all dom0_mem=2048M 
dom0_max_vcpus=2 dom0_vcpus_pin com2=115200 console=com2,vga
cc_compiler            : gcc (Debian 4.4.5-8) 4.4.5
cc_compile_by          : root
cc_compile_domain      : wsk.tu-chemnitz.de
cc_compile_date        : Thu Nov 22 13:50:09 CET 2012
xend_config_format     : 4

xl list before:

Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0  2048     2 r-----    3490.0
Squeeze                                     19  4091     2 -b----     370.3
win2k8_2_susi6                              31 16373    12 -b----    1619.3
win2k8_susi5                                33 32757    12 -b----    1264.0
win7_susi3                                  43  4085     4 -b----     416.0
scientific_susi7                            44  8192    16 -b----      39.9

domU config:

name = "centos_susi8"
uuid = "2e87b315-fd5a-dfbc-fe9d-6e121fdfa632"
maxmem = 16384
memory = 16384
vcpus = 16
builder = "generic"
bootloader = "pygrub"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
vfb = [ "type=vnc,vncunused=1,keymap=de" ]
disk = [ "phy:/dev/mapper/storage-SL5,xvda,w" ]
vif = [ "mac=00:50:56:37:61:17,bridge=xenbr0" ]

error message after:

xl create /root/configs/centos_susi8.cfg
Parsing config from /root/configs/centos_susi8.cfg
libxl: error: libxl.c:3433:libxl_set_memory_target: new target 0 for 
dom0 is below the minimum threshold

with 8gigs:

xl info after:

host                   : susi-0
release                : 3.1.1-xen
version                : #1 SMP Fri Nov 18 10:16:22 CET 2011
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 31
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 3325
hw_caps                : 
bfebfbff:2c100800:00000000:00003f40:029ee3ff:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 98291
free_memory            : 20776
sharing_freed_memory   : 0
sharing_used_memory    : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 2
xen_extra              : .1-pre
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Wed Nov 14 11:46:07 2012 +0000 25922:8ca6372315f8
xen_commandline        : placeholder loglvl=all dom0_mem=2048M 
dom0_max_vcpus=2 dom0_vcpus_pin com2=115200 console=com2,vga
cc_compiler            : gcc (Debian 4.4.5-8) 4.4.5
cc_compile_by          : root
cc_compile_domain      : wsk.tu-chemnitz.de
cc_compile_date        : Thu Nov 22 13:50:09 CET 2012
xend_config_format     : 4

xl list after:

Name                                        ID   Mem VCPUs State   Time(s)
Domain-0                                     0  2048     2 r-----    3550.0
Squeeze                                     19  4091     2 -b----     381.5
win2k8_2_susi6                              31 16373    12 -b----    1627.1
win2k8_susi5                                33 32757    12 ------    1269.0
win7_susi3                                  43  4085     4 -b----     418.7
scientific_susi7                            44  8192    16 -b----      40.3
centos_susi8                                46  8192    16 -b----       4.4




Am 23.11.2012 12:52, schrieb Pasi Kärkkäinen:
> On Fri, Nov 23, 2012 at 12:35:26PM +0100, Alexander Bienzeisler wrote:
> > Hello,
> >
> > i just tried to add a domU with 16 gigs of ram (maxmem = 16384,
> > memory = 16384) with free_memory : 28969 but got an error:
> >
> > libxl: error: libxl.c:3433:libxl_set_memory_target: new target 0 for
> > dom0 is below the minimum threshold
> >
> > I was able to create it with 8 gigs of ram, ending up with
> > free_memory : 20776
> >
> > Is there something wrong with memory in 4.2? I can't seem to use all of it.
> What exact Xen version are you using? what dom0 kernel version?
>
> Also please pastebin "xl info" and "xl list" before and after starting the VM.
>
> -- Pasi

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