[Xen-users] Dom0 and memory

[Luís Silva <luis.silva@xxxxxxxxxxxxx>]

Hello,

I'm trying to use Xen (4.0.1-rc2 with 2.6.32.x paravirt kernel) in a desktop machine. This machine has 4G ram, and xen gets 3884MB available, acording to xm info. Acording to xm list, dom0 gets 3884MB of memory, but dom0 kernel only sees about 2724MB. dom0_mem is unset at boot, but if set at 4G or 3884M the problem remains the same. As this is a desktop machine I would like dom0 to have the maximum available memory at boot and then balloon out as necessary. How can I achieve this?

Thanks in advance,
Luís

xm info
host                   : luis-port
release                : 2.6.32.15-1-pvops
version                : #5 SMP PREEMPT Wed Jun 16 16:56:00 WEST 2010
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 2
threads_per_core       : 2
cpu_mhz                : 2660
hw_caps                : bfebfbff:28100800:00000000:00001f40:0298e3ff:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 3884
free_memory            : 933
node_to_cpu            : node0:0-3
node_to_memory         : node0:933
node_to_dma32_mem      : node0:861
max_node_id            : 0
xen_major              : 4
xen_minor              : 0
xen_extra              : .1-rc2
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          : unavailable
xen_commandline        : 
cc_compiler            : gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) 
cc_compile_by          : buildd
cc_compile_domain      : ppa
cc_compile_date        : Thu Jun 10 16:58:29 UTC 2010
xend_config_format     : 4

==============================================================================

xm list 
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  3884     4     r-----    771.8
srv-001-ub1004                                   256     1                 0.0

==============================================================================

xm list -l
(domain
    (domid 0)
    (cpu_weight 256)
    (cpu_cap 0)
    (bootloader )
    (on_crash restart)
    (uuid 00000000-0000-0000-0000-000000000000)
    (bootloader_args )
    (vcpus 4)
    (description )
    (name Domain-0)
    (cpus (() () () ()))
    (on_reboot restart)
    (on_poweroff destroy)
    (maxmem 16777215)
    (memory 3884)
    (shadow_memory 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (cpu_time 776.139622245)
    (online_vcpus 4)
    (image (linux (kernel ) (superpages 0) (nomigrate 0) (tsc_mode 0)))
    (status 2)
    (state r-----)
)
(domain
    (cpu_weight 256)
    (cpu_cap 0)
    (bootloader /usr/bin/pygrub)
    (on_crash destroy)
    (uuid 2d701982-75c1-023b-c1ca-534363463e9e)
    (bootloader_args )
    (vcpus 1)
    (description )
    (name srv-001-ub1004)
    (cpus (()))
    (on_reboot restart)
    (on_poweroff destroy)
    (maxmem 256)
    (memory 256)
    (shadow_memory 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1276883490.07)
    (image
        (linux
            (kernel )
            (superpages 0)
            (pci ())
            (nomigrate 0)
            (tsc_mode 0)
            (device_model /usr/lib/xen/bin/qemu-dm)
            (notes
                (HV_START_LOW 18446603336221196288)
                (FEATURES '!writable_page_tables|pae_pgdir_above_4gb')
                (VIRT_BASE 18446744071562067968)
                (GUEST_VERSION 2.6)
                (PADDR_OFFSET 0)
                (GUEST_OS linux)
                (HYPERCALL_PAGE 18446744071578882048)
                (LOADER generic)
                (SUSPEND_CANCEL 1)
                (PAE_MODE yes)
                (ENTRY 18446744071587734016)
                (XEN_VERSION xen-3.0)
            )
        )
    )
    (status 0)
    (device
        (tap2
            (protocol x86_64-abi)
            (uuid 7d542bc6-8a64-6c06-881f-e03d8bbf75c3)
            (bootable 1)
            (dev xvda:disk)
            (uname tap:tapdisk:aio:/var/lib/libvirt/images/srv-001-ub1004.img)
            (mode w)
            (backend 0)
        )
    )
    (device
        (vif
            (bridge virbr0)
            (mac 00:16:36:47:57:87)
            (backend 0)
            (uuid 9682f5ef-382c-1415-3458-516fed1f0a8e)
            (script /etc/xen/scripts/vif-bridge)
        )
    )
    (device (vkbd (uuid 0ffbdeb0-5c30-3da6-27de-1724f6a55776) (backend 0)))
    (device
        (vfb
            (vncunused 0)
            (vnc 1)
            (uuid e7a111fa-8455-a18f-f30f-c0a4970da21b)
            (vnclisten 127.0.0.1)
            (vncdisplay 1)
            (keymap pt)
        )
    )
)

==============================================================================

cat /proc/meminfo 
MemTotal:        2789504 kB
MemFree:           28356 kB
Buffers:           12064 kB
Cached:           720924 kB
SwapCached:         2264 kB
Active:          1818904 kB
Inactive:         643364 kB
Active(anon):    1476156 kB
Inactive(anon):   371192 kB
Active(file):     342748 kB
Inactive(file):   272172 kB
Unevictable:          64 kB
Mlocked:              64 kB
SwapTotal:       3999736 kB
SwapFree:        3986772 kB
Dirty:                 8 kB
Writeback:             0 kB
AnonPages:       1727548 kB
Mapped:           103612 kB
Shmem:            118064 kB
Slab:              54860 kB
SReclaimable:      26128 kB
SUnreclaim:        28732 kB
KernelStack:        2768 kB
PageTables:        26524 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     5394488 kB
Committed_AS:    1820704 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      560132 kB
VmallocChunk:   34359176696 kB
HardwareCorrupted:     0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     2798464 kB
DirectMap2M:           0 kB

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