From mboxrd@z Thu Jan  1 00:00:00 1970
From: Victor fernandez <Victormanuel.fernandez@usc.es>
Subject: Re: Lost of performance over AMD-V with KVM?
Date: Tue, 09 Jul 2013 16:42:59 +0200
Message-ID: <51DC2173.30605@usc.es>
References: <51DC001B.2010703@usc.es>
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Hi Gleb,

     there are flags that with the tuning of KVM (-cpu host) we get tha=
t=20
some of
     important cpu flags are not included in SL6 ( Ht, rdtscp, 3dnowext=
,=20
3dnow,
constant_tsc,nonstop_tsc,amd_dcm,monitor,svm,extapic,osvw,ibs,skinit,wd=
t,nodeid_msr).

     And the machines used for testing were 2 nodes AMD 6128 - 2Ghz - 2=
=20
CPUs
     (8 Cores/CPU Core - 1GB) 16 Cores Total - 16 GB RAM for AMD-V=20
virtualization,
     and we did the same tests with the same software versions with 2=20
nodes of DELL
     PowerEdge SC1950, biprocessors dual core, 2 Xeon(R) CPU 5160 @=20
3.00GHz,
     16GB RAM. for Intel VT virtualization. And with Intel technology w=
e=20
get the
     typical virtualization performance, around 2-5% of lost.

      Thanks in advance,
         V=EDctor Fdez.