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From: Henrik Holst <henrik@witsbits.com>
To: Avi Kivity <avi@redhat.com>
Cc: Arne Kepp <ak@opengeo.org>, kvm@vger.kernel.org
Subject: Re: Poor write- and overall performance
Date: Mon, 15 Dec 2008 11:22:39 +0100	[thread overview]
Message-ID: <1229336559.5926.6.camel@henrik-desktop> (raw)
In-Reply-To: <4945FB64.3040109@redhat.com>

mån 2008-12-15 klockan 08:38 +0200 skrev Avi Kivity:
> Arne Kepp wrote:
> > Hi,
> >
> > I'm testing KVM 80 (prepackaged from lfarkas.org) on CentOS 5.2 (both 
> > guest and host) and comparing against Xen 3.3.0. The only modification 
> > I've really made is that I've set noatime on both guest and host. The 
> > guest is running straight from an LVM volume and is assigned 4 Gb RAM 
> > and 4 virtual CPUs.
> 
> I suggest trying scsi in kvm-81, or setting cache=writeback if you want 
> to keep using IDE (but be aware of the potential for severe data loss 
> with the latter option).
> 
Now I haven't tried kvm-81 but scsi with 4GB of RAM or more is severely
broken in QEMU for all other tested KVM versions (80 and downwards).

/Henrik Holst


  reply	other threads:[~2008-12-15 10:22 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-14 23:44 Poor write- and overall performance Arne Kepp
2008-12-15  6:38 ` Avi Kivity
2008-12-15 10:22   ` Henrik Holst [this message]
2008-12-15 10:26     ` Avi Kivity
2008-12-15 10:29       ` Henrik Holst
2008-12-20  1:44   ` Arne Kepp
2008-12-20  5:19     ` Ryan Harper

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