From: Avi Kivity <avi@redhat.com>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: Gerd Hoffmann <kraxel@redhat.com>, Stefan <kvm@pms.ifi.lmu.de>,
kvm@vger.kernel.org
Subject: Re: 64 bit guest much faster ?
Date: Mon, 26 Oct 2009 12:44:30 +0200 [thread overview]
Message-ID: <4AE57D8E.7090506@redhat.com> (raw)
In-Reply-To: <4AE57D04.10408@msgid.tls.msk.ru>
On 10/26/2009 12:42 PM, Michael Tokarev wrote:
>> Oh yes, without ept/npt the slowdown should indeed be significant
>> with this much memory.
>
>
> How it is with 4Gb guest/mem without PAE (I mean, with
> CONFIG_HIGHMEM_4G=y)?
> Or even 2Gb? In case of npt or without.
>
It'll be slow. Just use x86_64 with > 1GB.
> Can we construct a sort of a table of expected slowdowns (not in numbers
> but just in terms "significant", "minor" etc) of running <4Gb or >4Gb
> (and <1Gb and >1Gb if that makes significant diffencece) 32bit guests
> with and without npt and 64bit guests, please? I guess it's quite
> interesting to many users.
These tables will be useless, it greatly depends on workload.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2009-10-26 10:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-23 15:54 64 bit guest much faster ? Stefan
2009-10-25 5:41 ` Avi Kivity
2009-10-26 8:58 ` Gerd Hoffmann
2009-10-26 10:12 ` Avi Kivity
2009-10-26 10:42 ` Michael Tokarev
2009-10-26 10:44 ` Avi Kivity [this message]
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