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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Xen 3 not seeing the right amount of RAM on x86_64
Daniel Mealha Cabrita wrote: It looks like you're using a 32-bit Xen kernel without compiled PAE support. I don't think so from the output of "uname -a". But it looks strange. --Sadique Also looks like your non-Xen kernel is a 32-bit one with PAE support. Em Qua 28 Nov 2007 02:47, Chuck McIntyre escreveu:Hi, I am having a problem where Xen is not seeing the appropriate amount of memory allocated. At first I thought this was similar to previously described issues with the BIOS remapped hole for PCI devices (such as in a post here http://lists.xensource.com/archives/html/xen-users/2005-07/msg00177.html), however, we only see about 3.5GB (see below) of RAM regardless of whether we have a system with 4GB of RAM or 8GB of RAM (as seen by the BIOS). Regardless, when we boot into the non-xen kernel available on the same box, the OS then sees all the available RAM. I have tried to provide as much relevant information as I could without being spammy. Please let me know if I need to provide additional details. I would appreciate any help here, as this one has us stumped, or do we have a bug with our hardware version? __4GB system___ [me@molotov ~]$ uname -a Linux molotov.mydomain 2.6.18-8.1.15.el5.centos.plusxen #1 SMP Thu Oct 25 07:21:34 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux [me@molotov ~]$ rpm -qa | grep xen xen-3.0.3-25.0.4.el5 xen-libs-3.0.3-25.0.4.el5 xen-libs-3.0.3-25.0.4.el5 kernel-xen-2.6.18-8.1.15.el5.centos.plus [me@molotov ~]$ grep MemTotal /proc/meminfo MemTotal: 3428400 kB top gives me: Mem: 3428400k total, 422916k used, 3005484k free, 21648k buffers [root@molotov ~]# xm info 2>&1 | grep memory total_memory : 3535 free_memory : 129 xentop gives me: Mem: 3620404k total, 3488052k used, 132352k free CPUs: 4 @ 2200MHz dmesg BIOS-provided physical RAM map: Xen: 0000000000000000 - 00000000d1d4c000 (usable) On node 0 totalpages: 859468 DMA zone: 859468 pages, LIFO batch:31 DMI present. -=After reboot=- BIOS gives me: Initializing USB Controllers .. Done. 4096MB OK [me@molotov ~]$ grep MemTotal /proc/meminfo MemTotal: 4050520 kB top gives Mem: 4050520k total, 264668k used, 3785852k free, 20612k buffers dmesg BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009dc00 (usable) BIOS-e820: 000000000009dc00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000dcff0000 (usable) BIOS-e820: 00000000dcff0000 - 00000000dcffe000 (ACPI data) BIOS-e820: 00000000dcffe000 - 00000000dd000000 (ACPI NVS) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved) BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000123000000 (usable) DMI present. Bootmem setup node 0 0000000000000000-0000000080000000 Bootmem setup node 1 0000000080000000-0000000123000000 On node 0 totalpages: 515808 DMA zone: 2728 pages, LIFO batch:0 DMA32 zone: 513080 pages, LIFO batch:31 On node 1 totalpages: 515144 DMA32 zone: 373744 pages, LIFO batch:31 Normal zone: 141400 pages, LIFO batch:31 __ 8GB System __ [me@molotov ~]$ uname -a Linux benelli.mydomain 2.6.18-8.1.15.el5.centos.plusxen #1 SMP Thu Oct 25 07:21:34 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux [me@molotov ~]$ rpm -qa | grep xen kernel-xen-2.6.18-8.1.15.el5.centos.plus xen-libs-3.0.3-25.0.4.el5 xen-libs-3.0.3-25.0.4.el5 xen-3.0.3-25.0.4.el5 [me@benelli ~]$ grep MemTotal /proc/meminfo MemTotal: 3428336 kB top gives me: Mem: 3428336k total, 437888k used, 2990448k free, 16580k buffers [root@benelli ~]# xm info 2>&1| grep memory total_memory : 3535 free_memory : 0 xentop gives me: Mem: 3620336k total, 3620064k used, 272k free CPUs: 4 @ 2200MHz dmesg BIOS-provided physical RAM map: Xen: 0000000000000000 - 00000000d1d3c000 (usable) DMI present. -=After Reboot=- BIOS gives me: Initializing USB Controllers .. Done. 8192MB OK After reboot into non-xen kernel: [root@benelli ~]# grep MemTotal /proc/meminfo MemTotal: 8181124 kB Top gives Mem: 8181124k total, 284732k used, 7896392k free, 16944k buffers dmesg BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009c400 (usable) BIOS-e820: 000000000009c400 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000dcfe0000 (usable) BIOS-e820: 00000000dcfe0000 - 00000000dcfee000 (ACPI data) BIOS-e820: 00000000dcfee000 - 00000000dcff0000 (ACPI NVS) BIOS-e820: 00000000dcff0000 - 00000000dcffe000 (reserved) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved) BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000223000000 (usable) DMI present. Bootmem setup node 0 0000000000000000-0000000123000000 Bootmem setup node 1 0000000123000000-0000000223000000 On node 0 totalpages: 1030931 DMA zone: 2723 pages, LIFO batch:0 DMA32 zone: 886808 pages, LIFO batch:31 Normal zone: 141400 pages, LIFO batch:31 On node 1 totalpages: 1034240 Normal zone: 1034240 pages, LIFO batch:31 __Both Systems__ Here is grub.conf (equivalent on both systems): default=0 timeout=5 serial --unit=0 --speed=9600 terminal --timeout=5 serial console title CentOS (2.6.18-8.1.15.el5.centos.plusxen) root (hd0,0) kernel /boot/xen.gz-2.6.18-8.1.15.el5.centos.plus console=vga module /boot/vmlinuz-2.6.18-8.1.15.el5.centos.plusxen ro root=/dev/md0 console=ttyS0 console=ttyS0,9600n8 console=tty0 xencons=tty module /boot/initrd-2.6.18-8.1.15.el5.centos.plusxen.img title CentOS (2.6.18-8.1.15.el5.centos.plus) root (hd0,0) kernel /boot/vmlinuz-2.6.18-8.1.15.el5.centos.plus ro root=/dev/md0 console=ttyS0 console=ttyS0,9600n8 console=tty0 xencons=tty initrd /boot/initrd-2.6.18-8.1.15.el5.centos.plus.img _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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