Re: [Xen-users] how to optimize CentOS XEN dom0?

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

On Wed, Feb 23, 2011 at 6:13 PM, Jeff Sturm <jeff.sturm@xxxxxxxxxx> wrote:
>> -----Original Message-----
>> From: Rudi Ahlers [mailto:Rudi@xxxxxxxxxxx]
>> Sent: Wednesday, February 23, 2011 9:17 AM
>> To: Jeff Sturm
>> Cc: xen-users
>> Subject: Re: [Xen-users] how to optimize CentOS XEN dom0?
>>
>> These stats were taken a few minutes after the server was hard
> rebooted cause it
>> didn't respond anything on the network, internet or even console.
>
> I see.   Did the dom0 log anything (e.g. /var/log/messages) before it
> died?
>
> Might be helpful to install sysstat.  Using sar, I can see performance
> trends right up to the point where a server died, including load average
> and memory growth.
>
> -Jeff
>
>
>
> _______________________________________________



I see a lot of these errors in /var/log/messages shortly before it crashed:



Feb 22 15:27:14 zaxen01 kernel: HighMem: empty
Feb 22 15:27:14 zaxen01 kernel: 918 pagecache pages
Feb 22 15:27:14 zaxen01 kernel: Swap cache: add 2248198, delete
2248009, find 160685591/160898897, race 0+453
Feb 22 15:27:14 zaxen01 kernel: Free swap  = 0kB
Feb 22 15:27:14 zaxen01 kernel: Total swap = 4194296kB
Feb 22 15:27:14 zaxen01 kernel: Free swap:            0kB
Feb 22 15:27:14 zaxen01 kernel: 133120 pages of RAM
Feb 22 15:27:14 zaxen01 kernel: 22818 reserved pages
Feb 22 15:27:16 zaxen01 kernel: 105840 pages shared
Feb 22 15:27:16 zaxen01 kernel: 189 pages swap cached
Feb 22 15:27:17 zaxen01 kernel: Out of memory: Killed process 17464,
UID 99, (sendmail).
Feb 23 00:35:38 zaxen01 syslogd 1.4.1: restart.
Feb 23 00:35:38 zaxen01 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Feb 23 00:35:38 zaxen01 kernel: Bootdata ok (command line is ro
root=/dev/System/root rhgb quiet xencons=tty6)
Feb 23 00:35:38 zaxen01 kernel: Linux version 2.6.18-194.32.1.el5xen
(mockbuild@xxxxxxxxxxxxxxxxxxxx) (gcc version 4.1.2 20080704 (Red Hat
4.1.2-48)) #1 SMP
Wed Jan 5 18:44:24 EST 2011
Feb 23 00:35:38 zaxen01 kernel: BIOS-provided physical RAM map:
Feb 23 00:35:38 zaxen01 kernel:  Xen: 0000000000000000 -
0000000020800000 (usable)
Feb 23 00:35:38 zaxen01 kernel: DMI 2.4 present.
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC (acpi_id[0x01]
lapic_id[0x00] enabled)
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC (acpi_id[0x03]
lapic_id[0x02] enabled)
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC (acpi_id[0x02]
lapic_id[0x01] enabled)
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC (acpi_id[0x04]
lapic_id[0x03] enabled)
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl
lint[0x1])
Feb 23 00:35:38 zaxen01 kernel: ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl
lint[0x1])
Feb 23 00:35:38 zaxen01 kernel: ACPI: IOAPIC (id[0x02]
address[0xfec00000] gsi_base[0])
Feb 23 00:35:38 zaxen01 kernel: IOAPIC[0]: apic_id 2, version 32,
address 0xfec00000, GSI 0-23
Feb 23 00:35:38 zaxen01 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 0
global_irq 2 dfl dfl)
Feb 23 00:35:38 zaxen01 kernel: ACPI: INT_SRC_OVR (bus 0 bus_irq 9
global_irq 9 high level)
Feb 23 00:35:38 zaxen01 kernel: Setting APIC routing to xen
Feb 23 00:35:38 zaxen01 kernel: Using ACPI (MADT) for SMP
configuration information
Feb 23 00:35:38 zaxen01 kernel: Allocating PCI resources starting at
d4000000 (gap: d0000000:2ff00000)
Feb 23 00:35:38 zaxen01 kernel: Built 1 zonelists.  Total pages: 133120
Feb 23 00:35:38 zaxen01 kernel: Kernel command line: ro
root=/dev/System/root rhgb quiet xencons=tty6
Feb 23 00:35:38 zaxen01 kernel: Initializing CPU#0
Feb 23 00:35:38 zaxen01 kernel: PID hash table entries: 4096 (order:
12, 32768 bytes)





-- 
Kind Regards
Rudi Ahlers
SoftDux

Website: http://www.SoftDux.com
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