Xen users - Jul 2009 - Memory consumption of xend on x86_64

Hi,

On one of our servers which has 6GB RAM (dom0 RAM: 3GB), the xend service
is taking about 46% of the memory. Is this normal? We use xen on other
servers (8GB, 6GB RAM) too and in them xend is taking about 3% of the
memory.

This particular server if of x86_64 architecture where as the rest are of
i386. Is that the reason for xend taking so much RAM?

Regards,
Sree Harsha Totakura
Member, Open Source Platform - TEG
Tata Consultancy Services
Ph:- +91-22-67782038
Mailto: sreeharsha.totakura@tcs.com
Website: http://www.tcs.com
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Hi,

If I try to run 32bit hosts on a 64bit dom-0, will they run under HVM?

Also, How can I check whether the guests are running under PV or HVM? I use
virt-manager  it creates the virtual machines without the need to use xm.

Thanks-
Harsha

xen-users-bounces@lists.xensource.com wrote on 07/30/2009 05:10:16 PM:
> Sreeharsha Totakura <sreeharsha.totakura@tcs.com>
> Sent by: xen-users-bounces@lists.xensource.com
>
> 07/30/2009 05:10 PM
>
> To
>
> xen-users@lists.xensource.com
>
> cc
>
> Subject
>
> [Xen-users] Memory consumption of xend on x86_64
>
>
> Hi,
>
> On one of our servers which has 6GB RAM (dom0 RAM: 3GB), the xend service
> is taking about 46% of the memory. Is this normal? We use xen on other
> servers (8GB, 6GB RAM) too and in them xend is taking about 3% of the
> memory.
>
> This particular server if of x86_64 architecture where as the rest are of
> i386. Is that the reason for xend taking so much RAM?
> Regards,
-
Harsha

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I think you can l limit the amount of ram consumed by dom0 on 64 bit hosts
by modifying the kernel initialization statement in grub or lilo. just add
the line *dom0_mem*=512M or something similar. You can also change the
memory after initialization by running xm mem-set 0 512M and it should
change dom0

Rob


On Thu, Jul 30, 2009 at 4:40 AM, Sreeharsha Totakura <
sreeharsha.totakura@tcs.com> wrote:
>
> Hi,
>
> On one of our servers which has 6GB RAM (dom0 RAM: 3GB), the xend service
> is taking about 46% of the memory. Is this normal? We use xen on other
> servers (8GB, 6GB RAM) too and in them xend is taking about 3% of the
> memory.
>
> This particular server if of x86_64 architecture where as the rest are of
> i386. Is that the reason for xend taking so much RAM?
>
> Regards,
> Sree Harsha Totakura
> Member, Open Source Platform - TEG
> Tata Consultancy Services
> Ph:- +91-22-67782038
> Mailto: sreeharsha.totakura@tcs.com
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty.   IT Services
>                  Business Solutions
>                  Outsourcing
> ____________________________________________
>
> =====-----=====-----====> Notice: The information contained in this
e-mail
> message and/or attachments to it may contain
> confidential or privileged information. If you are
> not the intended recipient, any dissemination, use,
> review, distribution, printing or copying of the
> information contained in this e-mail message
> and/or attachments to it are strictly prohibited. If
> you have received this communication in error,
> please notify us by reply e-mail or telephone and
> immediately and permanently delete the message
> and any attachments. Thank you
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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On Fri, Jul 31, 2009 at 2:07 PM, Sreeharsha
Totakura<sreeharsha.totakura@tcs.com> wrote:
> Hi,
>
> If I try to run 32bit hosts on a 64bit dom-0, will they run under HVM?
Newer versions of Xen (I think 3.1+ will do) can run 32bit PV domU or
dom0 on top of 64bit hypervisor, so you don''t have to use HVM.
>
> Also, How can I check whether the guests are running under PV or HVM? I use
> virt-manager  it creates the virtual machines without the need to use xm.
The easiest way is to look what parameters you use to create the domU.
If you use -p or --paravirt, it will be PV. If you use -v or --hvm, it
will be HVM. Some domU (like Windows) only supports HVM.

Deterimining this from domU is somewhat harder. One way to do it is to
look at /proc/xen. If that directory exists then most likely it''s PV
domU.

-- 
Fajar

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