[CentOS-virt] A few questions
Ben Montanelli
montanelli at rivint.com
Tue Jul 14 21:23:45 UTC 2009
To begin: No "problem" per se at the moment. And thank you all for the
tips and information on this list.
If no one objects I would like to promote myself from "newb with scars"
to "clueless duffer."
I need to move forward on my builds and I have some xm dmesg items
unresolved or misunderstoo.
I have 2 domU's loaded, both CentOS 5.3, one as image, one as LVM
blocks. SELinux is On and Enforced in domUs (not yet in dom0).
Apparently all is currently stable.
Xen version 3.1.2-128.1.16.el5
domO = CentOS 5.3 current
Hardware = TYAN S2912G2NR mobo, AMD 2 x 2212, WD VelicoRaptors in Raid1
1) Are the below messages benign? I have read all over the place and
they are quoted in immediate lockup or failure to boot situations. I
have had not had a lockup or crash (after cleaning up the domU confs and
services, zeroing hwclocks, etc.) in days.
(XEN) ioapic_guest_write: apic=0, pin=2, old_irq=-1, new_irq=0
(XEN) ioapic_guest_write: old_entry=00010000, new_entry=000009f0
(XEN) ioapic_guest_write: Installing bogus unmasked IO-APIC entry!
(XEN) mm.c:649:d1 Error getting mfn 25654 (pfn 5555555555555555) from L1
entry 0000000025654025 for dom1
(XEN) mm.c:3327:d1 ptwr_emulate: fixing up invalid PAE PTE 0000000025654025
(XEN) mm.c:625:d2 Non-privileged (2) attempt to map I/O space 000cba6b
(XEN) mm.c:3327:d2 ptwr_emulate: fixing up invalid PAE PTE 00000000cba6b025
2) I went back to HPET because there seems no harm/difference. Does this
XM DMESG indicate Xen is "fixing" it, or do I have a loose end:
with HPET On (current state):
(XEN) ENABLING IO-APIC IRQs
(XEN) -> Using new ACK method
(XEN) Platform timer overflows in 8589 jiffies.
(XEN) Platform timer is 25.000MHz HPET
with HPET Off:
(XEN) ENABLING IO-APIC IRQs
(XEN) -> Using new ACK method
(XEN) ..MP-BIOS bug: 8254 timer not connected to IO-APIC
(XEN) works.
(XEN) Platform timer overflows in 2 jiffies.
(XEN) Platform timer is 1.193MHz PIT
Is HPET On and not setting clock to Jiffies going to bite me at some point?
3) I have been using the Apache ab "stress test" up to the edge of where
I get cut off with synflood protection. My Xen servers will be primarily
web applications and WAN services. When I first started test with ab I
was able to provoke "Time goes backwards" reactions. I tweaked Xen and
now I cannot crash or panic anything.
Is stress testing with ab an appropriate test for my environment and I
can feel a bit more confident and move forward on my build?
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