Re: IO on guest is 20 times slower than host

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On Mar 29, 2009, at 10:29 AM, Avi Kivity wrote:

Kurt Yoder wrote:
slow host cpu information, core 1 of 16:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 16
model           : 4
model name      : Quad-Core AMD Opteron(tm) Processor 8382
stepping        : 2
cpu MHz         : 2611.998
cache size      : 512 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall mmxext fxsr_opt
pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl pni monitor
cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a
misalignsse 3dnowprefetch osvw ibs skinit wdt
bogomips        : 5223.97
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate




Can you loading kvm_amd on this host with 'modprobe kvm-amd npt=0'?

So that's most likely the problem for me:

me@host:/etc/nagios/nrpe_directives$ sudo modprobe kvm-amd npt=0
FATAL: Error inserting kvm_amd (/lib/modules/2.6.27-11-server/kernel/ arch/x86/kvm/kvm-amd.ko): Operation not supported
me@host:/etc/nagios/nrpe_directives$ uname -a
Linux boron 2.6.27-11-server #1 SMP Thu Jan 29 20:13:12 UTC 2009 x86_64 GNU/Linux


It looks like I need to enable SVM in my BIOS. I'll do that and report back on the results.

-Kurt
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