Debian
Xen 伺服器：可用記憶體！= dmidecode -t17 輸出
概述
我在 Debian buster 上執行 Xen 伺服器。最新核心、最新 BIOS 版本、舊版引導。
引導到 Xen 伺服器僅顯示 8 GB 的可用 RAM，同時辨識出 16 GB 的 RAM 已連接。
在沒有 Xen 的情況下啟動到 Debian 顯示所有 16 GB 的 RAM 空閒。
**我的問題：**知道我能做些什麼來強制 Xen 使用全部 16 GB 嗎？
例如，我可以看到
xl dmesg由於某些不匹配而使用 32 位定址而不是 64 位定址是錯誤的。我可以強制 ACPI 使用 64 位嗎？日誌
來自 Xen
啟動到 Xen 顯示
ACPI: 32/64X FACS address mismatch in FADT - da7ed080/0000000000000000, using 32並使用總共 16 GB 的 RAM 中的 8 GB。user@server:~/ free -m free -m total used free shared buff/cache available Mem: 7387 379 6635 9 373 6841 Swap: 16291 0 16291 user@server:~/ dmidecode -t17 # dmidecode 3.2 Getting SMBIOS data from sysfs. SMBIOS 2.7 present. Handle 0x0041, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM3 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1600 MT/s Manufacturer: Samsung Serial Number: 03B0650F7097 Asset Tag: 02151000 Part Number: M378B5173QH0-CK0 Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0043, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM1 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1333 MT/s Manufacturer: Kingston Serial Number: 05009D00801C Asset Tag: 07194900 Part Number: 99U5402-034.A00LF Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0045, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM4 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1600 MT/s Manufacturer: Samsung Serial Number: 0330650F7097 Asset Tag: 02151000 Part Number: M378B5173QH0-CK0 Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0047, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM2 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1333 MT/s Manufacturer: Kingston Serial Number: 0500A4008015 Asset Tag: 07194900 Part Number: 99U5402-034.A00LF Rank: 1 Configured Memory Speed: 1333 MT/s user@server:~/ xl dmesg (XEN) parameter "placeholder" unknown! (XEN) Xen version 4.11.4-pre (Debian 4.11.3+24-g14b62ab3e5-1~deb10u1) (pkg-xen-devel@lists.alioth.debian.org) (gcc (Debian 8.3.0-6) 8.3.0) debug=n Wed Jan 8 20:16:51 UTC 2020 (XEN) Bootloader: GRUB 2.02+dfsg1-20 (XEN) Command line: placeholder (XEN) Xen image load base address: 0xdb000000 (XEN) Video information: (XEN) VGA is text mode 80x25, font 8x16 (XEN) VBE/DDC methods: V2; EDID transfer time: 1 seconds (XEN) Disc information: (XEN) Found 1 MBR signatures (XEN) Found 3 EDD information structures (XEN) Xen-e820 RAM map: (XEN) 0000000000000000 - 000000000009d800 (usable) (XEN) 000000000009d800 - 00000000000a0000 (reserved) (XEN) 00000000000e0000 - 0000000000100000 (reserved) (XEN) 0000000000100000 - 00000000d0ad5000 (usable) (XEN) 00000000d0ad5000 - 00000000d0adc000 (ACPI NVS) (XEN) 00000000d0adc000 - 00000000d0f18000 (usable) (XEN) 00000000d0f18000 - 00000000d13af000 (reserved) (XEN) 00000000d13af000 - 00000000d7eeb000 (usable) (XEN) 00000000d7eeb000 - 00000000d8000000 (reserved) (XEN) 00000000d8000000 - 00000000d8760000 (usable) (XEN) 00000000d8760000 - 00000000d8800000 (reserved) (XEN) 00000000d8800000 - 00000000d8fae000 (usable) (XEN) 00000000d8fae000 - 00000000d9000000 (ACPI data) (XEN) 00000000d9000000 - 00000000da71c000 (usable) (XEN) 00000000da71c000 - 00000000da800000 (ACPI NVS) (XEN) 00000000da800000 - 00000000dbe11000 (usable) (XEN) 00000000dbe11000 - 00000000dc000000 (reserved) (XEN) 00000000dd000000 - 00000000df200000 (reserved) (XEN) 00000000f8000000 - 00000000fc000000 (reserved) (XEN) 00000000fec00000 - 00000000fec01000 (reserved) (XEN) 00000000fed00000 - 00000000fed04000 (reserved) (XEN) 00000000fed1c000 - 00000000fed20000 (reserved) (XEN) 00000000fee00000 - 00000000fee01000 (reserved) (XEN) 00000000ff000000 - 0000000100000000 (reserved) (XEN) 0000000100000000 - 000000041ee00000 (usable) (XEN) ACPI: RSDP 000F0490, 0024 (r2 DELL ) (XEN) ACPI: XSDT D8FED098, 00AC (r1 DELL CBX3 1072009 AMI 10013) (XEN) ACPI: FACP D8FF8B50, 010C (r5 DELL CBX3 1072009 AMI 10013) (XEN) ACPI: DSDT D8FED1D0, B97E (r2 DELL CBX3 14 INTL 20091112) (XEN) ACPI: FACS DA7ED080, 0040 (XEN) ACPI: APIC D8FF8C60, 0092 (r3 DELL CBX3 1072009 AMI 10013) (XEN) ACPI: FPDT D8FF8CF8, 0044 (r1 DELL CBX3 1072009 AMI 10013) (XEN) ACPI: SLIC D8FF8D40, 0176 (r3 DELL CBX3 1072009 MSFT 10013) (XEN) ACPI: LPIT D8FF8EB8, 005C (r1 DELL CBX3 0 AMI. 5) (XEN) ACPI: SSDT D8FF8F18, 0539 (r1 PmRef Cpu0Ist 3000 INTL 20120711) (XEN) ACPI: SSDT D8FF9458, 0AD8 (r1 PmRef CpuPm 3000 INTL 20120711) (XEN) ACPI: SSDT D8FF9F30, 01C7 (r1 PmRef LakeTiny 3000 INTL 20120711) (XEN) ACPI: HPET D8FFA0F8, 0038 (r1 DELL CBX3 1072009 AMI. 5) (XEN) ACPI: SSDT D8FFA130, 036D (r1 SataRe SataTabl 1000 INTL 20120711) (XEN) ACPI: MCFG D8FFA4A0, 003C (r1 DELL CBX3 1072009 MSFT 97) (XEN) ACPI: SSDT D8FFA4E0, 34D6 (r1 SaSsdt SaSsdt 3000 INTL 20091112) (XEN) ACPI: ASF! D8FFD9B8, 00A5 (r32 INTEL HCG 1 TFSM F4240) (XEN) ACPI: SSDT D8FFDA60, 0587 (r1 AMITCG PROC 1 INTL 20120711) (XEN) ACPI: MSDM D8FFDFE8, 0055 (r3 DELL CBX3 6222004 AMI 10013) (XEN) ACPI: DMAR D8FFE040, 00B8 (r1 INTEL HSW 1 INTL 1) (XEN) ACPI: TCPA D8FFE0F8, 0032 (r2 APTIO4 NAPAASF 1 MSFT 1000013) (XEN) System RAM: 16292MB (16683156kB) (XEN) Domain heap initialised (XEN) ACPI: 32/64X FACS address mismatch in FADT - da7ed080/0000000000000000, using 32 (XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23 (XEN) Enabling APIC mode: Flat. Using 1 I/O APICs (XEN) Switched to APIC driver x2apic_cluster (XEN) xstate: size: 0x340 and states: 0x7 user@server:~/ xl info host : server release : 4.19.0-8-amd64 version : #1 SMP Debian 4.19.98-1 (2020-01-26) machine : x86_64 nr_cpus : 8 max_cpu_id : 7 nr_nodes : 1 cores_per_socket : 4 threads_per_core : 2 cpu_mhz : 3591.702 hw_caps : bfebfbff:77faf3ff:2c100800:00000021:00000001:000027ab:00000000:00000100 virt_caps : hvm hvm_directio total_memory : 16292 free_memory : 8278 sharing_freed_memory : 0 sharing_used_memory : 0 outstanding_claims : 0 free_cpus : 0 xen_major : 4 xen_minor : 11 xen_extra : .4-pre xen_version : 4.11.4-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 : xen_commandline : placeholder cc_compiler : gcc (Debian 8.3.0-6) 8.3.0 cc_compile_by : pkg-xen-devel cc_compile_domain : lists.alioth.debian.org cc_compile_date : Wed Jan 8 20:16:51 UTC 2020 build_id : b6822aa1d8f867753b92985e5cb0e806e520a08c xend_config_format : 4來自 Debian Buster（沒有 Xen）
在沒有 Xen 的情況下啟動到 Debian buster 會產生完整的 16 GB，一切都很好。
user@server:~/ free -m total used free shared buff/cache available Mem: 15950 388 15310 8 251 15292 Swap: 16291 0 16291 user@server:~/ dmidecode -t17 # dmidecode 3.2 Getting SMBIOS data from sysfs. SMBIOS 2.7 present. Handle 0x0041, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM3 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1600 MT/s Manufacturer: Samsung Serial Number: 03B0650F7097 Asset Tag: 02151000 Part Number: M378B5173QH0-CK0 Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0043, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM1 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1333 MT/s Manufacturer: Kingston Serial Number: 05009D00801C Asset Tag: 07194900 Part Number: 99U5402-034.A00LF Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0045, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM4 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1600 MT/s Manufacturer: Samsung Serial Number: 0330650F7097 Asset Tag: 02151000 Part Number: M378B5173QH0-CK0 Rank: 1 Configured Memory Speed: 1333 MT/s Handle 0x0047, DMI type 17, 34 bytes Memory Device Array Handle: 0x0040 Error Information Handle: Not Provided Total Width: 64 bits Data Width: 64 bits Size: 4096 MB Form Factor: DIMM Set: None Locator: DIMM2 Bank Locator: Not Specified Type: DDR3 Type Detail: Synchronous Speed: 1333 MT/s Manufacturer: Kingston Serial Number: 0500A4008015 Asset Tag: 07194900 Part Number: 99U5402-034.A00LF Rank: 1 Configured Memory Speed: 1333 MT/s
total_memory : 16292 free_memory : 8278in
xl info的輸出顯示 Xen 正在使用所有可用記憶體，但不是以您期望的方式：它看到所有 16GiB，但未分配的記憶體剛剛超過 8GiB。所以你的 dom0 看到不到 8GiB 的記憶體，其餘的可供 domUs 使用。如果要為 dom0 分配更多記憶體，則需要編輯引導載入程序配置。
（32/64X 錯誤消息並不意味著系統正在切換到 32 位定址；這意味著 ACPI 表中的地址不匹配，並且核心正在使用有效地址，即此處的 32 位地址。這只會影響它如何找到特定的 ACPI 表。）