RE: [Xen-users] Why my system only use 3.3G memory ?

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

(XEN) Physical RAM map:
(XEN)  0000000000000000 - 00000000000a0000 (usable)
(XEN)  0000000000100000 - 00000000cffc0000 (usable)
(XEN)  00000000cffc0000 - 00000000cffcfc00 (ACPI data)
(XEN)  00000000cffcfc00 - 00000000cffff000 (reserved)
(XEN)  00000000e0000000 - 00000000fec90000 (reserved)
(XEN)  00000000fed00000 - 00000000fed00400 (reserved)
(XEN)  00000000fee00000 - 00000000fee10000 (reserved)
(XEN)  00000000ffb00000 - 0000000100000000 (reserved)
(XEN) System RAM: 3327MB (3407232kB)

Your BIOS has created a whole at the top of the memory map into which the 
memory mapped PCI devices have been placed, effectively hiding the memory from 
use.

What is slightly odd is that the whole is larger than I've seen before. I 
presume its the area between cffff000 and e0000000 which isn't listed in the 
e820 map (everything above cffc0000 is unusable). 

You'll have to wait until xen3 and use x86_32pae or x86_64 to use more memory.

Ian

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> she11c0de she11c0de
> Sent: 07 July 2005 06:50
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Why my system only use 3.3G memory ?
> 
> Hi, all
> 
> I have a server used to install Xen-2.0.6 on CentOS 4.1 i386, 
> hardware is DELL 2850, dual Xeon 3.2G CPU, 6G memory, use 
> myself custom compiled xen kernel(dom0 and domU), i know xen 
> 2.0 on i386 only use 4G memory, but i found on my server, 
> it's only use 3327M memory, whit's problem, who can help me?
> 
> Here is some info.
> 
> [root@CentOS4 ~]#  xm info
> system                 : Linux
> host                   : CentOS4
> release                : 2.6.11.10-xen0
> version                : #3 Fri Jul 1 02:54:48 CST 2005
> machine                : i686
> cores                  : 2
> hyperthreads_per_core  : 2
> cpu_mhz                : 3192
> memory                 : 3327
> free_memory            : 2913
> 
> 
> [root@CentOS4 ~]#  xm dmesg | less
> ERROR: cannot use unconfigured serial port COM1
>  __  __            ____    ___   __   
>  \ \/ /___ _ __   |___ \  / _ \ / /_  
>   \  // _ \ '_ \    __) || | | | '_ \ 
>   /  \  __/ | | |  / __/ | |_| | (_) |
>  /_/\_\___|_| |_| |_____(_)___(_)___/ 
>                                       
>  http://www.cl.cam.ac.uk/netos/xen
>  University of Cambridge Computer Laboratory
> 
>  Xen version 2.0.6 (tongjian@(none)) (gcc version 3.4.3 
> 20050227 (Red Hat 3.4.3-22.1)) Fri Jul  1 02:53:42 CST 2005  
> Latest ChangeSet: information unavailable
> 
> (XEN) WARNING: Only the first 4GB of the physical memory map 
> can be accessed
> (XEN)          by Xen in 32-bit mode. Truncating the memory map...
> (XEN) Physical RAM map:
> (XEN)  0000000000000000 - 00000000000a0000 (usable)
> (XEN)  0000000000100000 - 00000000cffc0000 (usable)
> (XEN)  00000000cffc0000 - 00000000cffcfc00 (ACPI data)
> (XEN)  00000000cffcfc00 - 00000000cffff000 (reserved)
> (XEN)  00000000e0000000 - 00000000fec90000 (reserved)
> (XEN)  00000000fed00000 - 00000000fed00400 (reserved)
> (XEN)  00000000fee00000 - 00000000fee10000 (reserved)
> (XEN)  00000000ffb00000 - 0000000100000000 (reserved)
> (XEN) System RAM: 3327MB (3407232kB)
> (XEN) Xen heap: 10MB (10680kB)
> (XEN) CPU0: Before vendor init, caps: bfebfbff 20100000 
> 00000000, vendor = 0
> (XEN) CPU#0: Physical ID: 0, Logical ID: 0
> (XEN) CPU caps: bfebfbff 20100000 00000000 00000000
> (XEN) found SMP MP-table at 000fe710
> (XEN) ACPI: RSDP (v000 DELL                                   
>    ) @ 0x000fd650
> (XEN) ACPI: RSDT (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd664
> (XEN) ACPI: FADT (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd6b0
> (XEN) ACPI: MADT (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd724
> (XEN) ACPI: SPCR (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd7cc
> (XEN) ACPI: HPET (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd81c
> (XEN) ACPI: MCFG (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000a) @ 0x000fd854
> (XEN) ACPI: DSDT (v001 DELL   PE BKC   0x00000001 MSFT 
> 0x0100000e) @ 0x00000000
> (XEN) ACPI: Local APIC address 0xfee00000
> (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
> (XEN) Processor #0 Unknown CPU [15:4] APIC version 20
> (XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x06] enabled)
> (XEN) Processor #6 Unknown CPU [15:4] APIC version 20
> (XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x01] enabled)
> (XEN) Processor #1 Unknown CPU [15:4] APIC version 20
> [root@CentOS4 ~]# 
> 
>  
> 
>  
> 
> 
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