Re: IO on guest is 20 times slower than host

From: Avi Kivity <avi@redhat.com>
To: Kurt Yoder <ktykvm@yoderhome.com>
Cc: kvm@vger.kernel.org
Subject: Re: IO on guest is 20 times slower than host
Date: Sun, 29 Mar 2009 17:29:39 +0300	[thread overview]
Message-ID: <49CF85D3.1020507@redhat.com> (raw)
In-Reply-To: <52871.140.147.222.3.1238163053.squirrel@dyn.yoderhome.com>

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'?

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