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xen-devel
Re: [Xen-devel] [Fwd: [Xen-users] Dom0 and memory]
My suspicion would be the dom0 kernel and I'd try a different kernel to see
if that has the same issue. For example, the XCP patch queue (basically
Citrix XenServer's dom0 kernel) which applies on top of a vanilla 2.6.27
source tree: http://xenbits.xen.org/xapi/linux-2.6.27.pq.hg
Basically it looks like the dom0 kernel is voluntarily giving up 900M of
memory, for some reason, even though Xen and tools would like it to have
that memory.
-- Keir
On 26/06/2010 12:24, "Luís Silva" <luis.silva@xxxxxxxxxxxxx> wrote:
> Hello,
>
> I posted this email on xen-users a while back and I got no answer. I thought
> it could be a configuration problem and didn't want to cause unnecessary noise
> on xen-devel...
>
> As no aswers came and I found no documentation supporting this behaviour I'm
> posting now to xen-devel. Xen was updated to 4.0.1-rc3 and the problem stayed
> the same.
>
> Can anyone help me?
>
> Thanks,
> Luís
>
> -------- Forwarded Message --------
>> From: Luís Silva <luis.silva@xxxxxxxxxxxxx
>> <mailto:%3d%3fISO-8859-1%3fQ%3fLu%3dEDs%3f%3d%20Silva%20%3cluis.silva@axiomas
>> oft.pt%3e> >
>> Reply-to: luis.silva@xxxxxxxxxxxxx
>> To: Xen-users@xxxxxxxxxxxxxxxxxxx
>> Subject: [Xen-users] Dom0 and memory
>> Date: Sat, 19 Jun 2010 12:01:53 +0100
>>
>> 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
>>
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>
>
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