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Today's Topics:
1. Re: vcpus higher than real cpus possible? (Mark Williamson)
2. Re: Live Migration Query (Asim)
3. Re: Getting dumU real mem usage (Mark Williamson)
4. Re: sEDF Scheduling question (Todd Deshane)
5. Re: Live migration not moving the disk image. Is is supposed
to? (Mark Williamson)
6. Re: IBM x445, anyone using it? (isplist@xxxxxxxxxxxx)
7. RE: Loading FreeBSD in an HVM-domain on Intel-basedhost with
GRUB (Patro, Sumant)
----------------------------------------------------------------------
Message: 1
Date: Mon, 19 May 2008 15:32:15 +0100
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-users] vcpus higher than real cpus possible?
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: "\[STD\]Ein" <ein@xxxxxxxxxxxxxx>, Stefan de Konink
<skinkie@xxxxxxxxx>, 'David Hl?cik' <david@xxxxxxxxx>
Message-ID: <200805191532.17778.mark.williamson@xxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
Having more vcpuÂ?s assigned to a domu than real cpuÂ?s is not a
supported
scenario, although it does seem to work. The scheduling of such a
configuration is a nightmare though, and your guest system will be
interrupting itself when it believes concurrent processing is
taking place,
which could (will?) lead to instability. You would likely see more
cpu
time spent on state switching than actual work in such a setup.
It shouldn't give you instability but it is not efficient so I
wouldn't
recommend it unless you need it for some reason.
Think of VCPUs in a VM as like rather like threads in a process.
The system
can cope with having more of them than there are logical CPUs, it
just won't
be able to run them all at once.
One difference is that although there are efficient ways of having
more
threads in a process than there are logical CPUs, it's very rarely
going to
be efficient to have more VCPUs than logical CPUs. It misleads the
guest OS
into thinking it's on a bigger system than it is, resulting in it
wasting
time trying to use the extra CPUs. As [STD]ein said, the VCPUs will
compete
with each other for time on the real machine - wasting time.
For a PV domU you can hot-unplug CPUs from a running domain in order
to
optimise it for the physical system it's running on. I don't know
if this
has been done for an HVM guest, I'd assume you have to set the number
correctly at boot time.
Cheers,
Mark
_____
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of David
Hlácik
Sent: May 17, 2008 3:51 PM
To: Stefan de Konink
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] vcpus higher than real cpus possible?
But best approach is to use VCPUs same as real CPUs to achieve best
performace right?
Thanks,
D.
On Sat, May 17, 2008 at 10:32 PM, Stefan de Konink
<skinkie@xxxxxxxxx>
wrote:
On Sat, 17 May 2008, [ISO-8859-2] David Hláèik wrote:
Hello, i have just migrated machine to xen server where only 2
cpus are
available. I have copied config from machine where domU was located
before.
That machine had 4 CPUS (QUADCORE), current machine has 2 CPUS (1
XEON
2cores).
I have forgot to change vcpus from 4 to 2 in config, but .. what
really
surprised me ... machine started . How it is possible? It was
really slow
alltought and not possible for working (Windows server 2003).
Since Xen is always doing this :) Think for one processor having 2
DomU's
running. Technically you have then 3 vcpu's on the same moment. It
is just
about scheduling tasks for a vcpu.
Stefan
--
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/
)
------------------------------
Message: 2
Date: Mon, 19 May 2008 07:36:41 -0700
From: Asim <linkasim@xxxxxxxxx>
Subject: Re: [Xen-users] Live Migration Query
To: "Stein, Tim" <Tim.O.Stein@xxxxxxxxxxxxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Message-ID:
<7ef321c10805190736x1a0dadf7w904f54d3a2ce6ef7@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
I'm using Xen 3.1.4. It is a 32 bit host on a 32 bit kernel for dom0
but the
machine is 64 bit.
Did you get this error as well => ERROR Internal error: Couldn't
enable
shadow mode
I thought it has something to do with PAE mode.
Thanks,
Asim
On Sun, May 18, 2008 at 11:18 PM, Stein, Tim <
Tim.O.Stein@xxxxxxxxxxxxxxxxxxx> wrote:
Am Sonntag, 18. Mai 2008 schrieb Asim:
Error: /usr/lib/xen/bin/xc_save 23 3 0 0 1 failed
What version of Xen are you using? I had a similar problem when
trying to
migrate a 32bit guest under a 64bit host with Xen 3.04. Xen 3.2
solved this
issue for me.
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Message: 3
Date: Mon, 19 May 2008 17:21:52 +0100
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Getting dumU real mem usage
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: MS <ms@xxxxxxxxxx>
Message-ID: <200805191721.53913.mark.williamson@xxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-15"
Hi there,
i need to get at my dom0 the real memory usage of a domU.
The real used memoy (like /proc/meminfo), not just the allocated
mem who
is shown eg. at xentop.
There's not currently a way to do this. Dan Magenheimer is working
on some
metrics for determining memory pressure in a domU; I don't know if
it's
exactly what you're looking for but it's certainly related. His
work is
aimed at automatically ballooning guests according to what memory
they need,
so that the overall throughput of your Xen system can be higher.
Cheers,
mark
--
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/
)
------------------------------
Message: 4
Date: Mon, 19 May 2008 13:48:21 -0400
From: "Todd Deshane" <deshantm@xxxxxxxxx>
Subject: Re: [Xen-users] sEDF Scheduling question
To: "Koen van Besien" <koen.vanbesien@xxxxxxxxx>
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Message-ID:
<1e16a9ed0805191048r28ff3c46rceaa9a7ca1dc08a2@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi Koen,
On Sun, May 18, 2008 at 8:55 AM, Koen van Besien
<koen.vanbesien@xxxxxxxxx> wrote:
Hi,
I was wondering if there is some more information about the sEDF
scheduler and its parameters.
Or people who have some experience with it.
As I recall, sEDF has been deprecated (replaced with the credit
scheduler).
See: http://lists.xensource.com/archives/html/xen-users/2007-01/msg00312.html
Cheers,
Todd
------------------------------
Message: 5
Date: Mon, 19 May 2008 19:11:03 +0100
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Live migration not moving the disk image. Is
is supposed to?
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: 'Stefan de Konink' <skinkie@xxxxxxxxx>, "Jamie J. Begin"
<begin@xxxxxxxxxxxxxxx>
Message-ID: <200805191911.06024.mark.williamson@xxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
From: Stefan de Konink [mailto:skinkie@xxxxxxxxx]
Sent: Thursday, May 15, 2008 7:28 PM
To: Jamie J. Begin
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Live migration not moving the disk image.
Is is
supposed to?
On Thu, 15 May 2008, Jamie J. Begin wrote:
From my reading, it looks like performing "xm migrate -live domU
target_server" ought to also copy the disk image. Am I right?
When I attempt this procedure, everything looks to work except
for the
image
file getting moved. The command takes about 30 seconds to
complete and
then
"xm list" shows the domU to be gone from the old host and running
on
the
new
host. The SSH connection to the domU also continues to function
without
a
hiccup. However, the disk image isn't located anywhere on the new
server.
Also, the xen log on the new server lists the following error:
[2008-05-15 19:10:21 xend 3790] ERROR (XendCheckpoint:275) Device
51712
(tap) could not be connected.
/virt/myserver.img does not exist
That sounds pretty much like expected behavior. This is why you
require
something like NFS, DRBD, iSCSI to have the storage available over
more
than one machine at a time.
Stefan
Ok, thanks. I just wanted to make sure that this was expected
behavior.
Yeah, iSCSI is forthcoming for the production environment. I'm just
testing a few things here.
You do need to have the storage accessible from multiple machines in
order to
support live migration. You can either do this by having dom0
access the
storage (e.g. over SAN or network) and export it to the domU as a
VBD (I
recommend this, it's more transparent) or by setting up the domU to
access
its storage directly over the network (e.g. using iSCSI root or NFS
root).
Xen includes some NBD-aware block scripts to make it easy to handle
NBD-based
block devices in an automated way. Stefan has, I believe, published
some
iSCSI (and Netapp filer specific) block scripts on these mailing
lists, which
may also prove useful.
Cheers,
Mark
--
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/
)
------------------------------
Message: 6
Date: Mon, 19 May 2008 13:15:20 -0500
From: "isplist@xxxxxxxxxxxx" <isplist@xxxxxxxxxxxx>
Subject: Re: [Xen-users] IBM x445, anyone using it?
To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Message-ID: <2008519131520.519815@leena>
Content-Type: text/plain; charset="ISO-8859-1"
Yep. The max for a single node x445 is 8 processors, no dual core
support that I am aware of.
What type of processors should I be looking for which are properly
supported then?
showed up in RHEL and SLES. Also, to the best of my recollection,
they were 32bit only boxes. And, as I said before, there is no
hardware virutalization support on those processors or BIOS.
Yes, 32bit.
Just from the little bit you have shared, your problem has NOTHING
to
do with hardware virtualization, unless you are trying to take a HVM
guest from one Xen box that supports VT, and trying to run it on a
different Xen box that does NOT support VT.
It's just a fresh CentOS install with Virtualization because I
wanted to try out Xen.
Sounds more like a filesystem issue or something like that.
I'm not sure that there is a problem, perhaps a little configuration
which is not installed by default or such?
Really, use virt-manager or YaST and install a paravirtualized guest
just to see if it works. Besides, you have a running system, and a
running Dom0, so Xen works. Dom0 is, in reality, just a
paravirtualized guest OS running on the hypervisor.
That's exactly what I've tried and received the path error :).
Using Virtual Machine Manager, I've tried to install a pre-
configured ISO. It was simply what I had handy. I can try something
else. Is there something I can try from the command line? I just
want a basic Linux install, no servers, nothing for now.
What does this mean? You copied a working guest filesystem image to
your new Xen box, or you copied an install tree? What OS are you
using for the Host? What OS are you using for the guest? How is
your
install tree set up (file tree, ISO, or what?)
It's an ISO of a pre-installed CentOS OS with qmail pre-configured
along with other tools. Just had it handy when I first gave this a
quick try.
Again, as I said before, you will not have Fully Virtualized
abilities
on the x445, it does not support the hardware virtualization code,
and
I am almost sure that it won't even support the processors that have
HVM code on them (Though that is just a guess, so YMMV there).
That's fine, like I too said, I just happen to have these machines
sitting here so was hoping I might be able to use them with Xen.
From what I can tell, I won't be needing fully virtualized machines
anyhow. I don't tend to consolidate things which I try to get the
most power from. In other words, I won't be virtualizing machines
which need to be as powerful as they can be. I will be virtualizing
machines which don't do a lot, DNS servers for example are pretty
simple I/O machines, very low use web, mail, other servers, things
like that.
And to answer your other questions... virtualbox may work, but it's
rather new, and I've never tried it myself. VMWare MAY work,
I didn't ask about this but I think it's in the thread somewhere.
Either way, if I can use the x445 for non fully virtualized
machines, that still would be cool. It would allow me to shut down a
couple dozen low use boxes, virtualizing them along with their
storage on SAN.
But again, you have Xen booted, and a running Dom0, so Xen is doing
what it's supposed to do... my money is on a bad install tree (which
is what that error you shared seems to point to) or trying to run a
full virt guest from one Xen box on a second Xen box that does not
support full virt.
I'll look around for a guest which is known to easily work para-
virtualized. If you know of one, please let me know in the meantime.
Thanks.
Mike
------------------------------
Message: 7
Date: Mon, 19 May 2008 12:30:01 -0600
From: "Patro, Sumant" <Sumant.Patro@xxxxxxx>
Subject: RE: [Xen-users] Loading FreeBSD in an HVM-domain on
Intel-basedhost with GRUB
To: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Message-ID:
<0631C836DBF79F42B5A60C8C8D4E82290109C112@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Thank you Boris.
I could install FreeBSD 7.0 DomU with the instructions listed in the
link you provided.
Regards,
Sumant
________________________________
From: Boris Derzhavets [mailto:bderzhavets@xxxxxxxxx]
Sent: Thursday, May 15, 2008 2:15 AM
To: Patro, Sumant
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Loading FreeBSD in an HVM-domain on
Intel-basedhost with GRUB
Install HVM FreeBSD 7.0 DomU (32-bit) at Xen 3.2.1 CentOS 5.1 Dom0
(64-bit)
http://bderzhavets.blogspot.com/2008/04/install-hvm-freebsd-7.html
----- Original Message ----
From: "Patro, Sumant" <Sumant.Patro@xxxxxxx>
To: Igor Chubin <igor@xxxxxxx>; Keir.Fraser@xxxxxxxxxxxx;
kip.macy@xxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Wednesday, May 14, 2008 10:07:59 PM
Subject: RE: [Xen-users] Loading FreeBSD in an HVM-domain on
Intel-basedhost with GRUB
Hello All,
I am trying to install FreeBSD 7.0 (8.0-current) as a guest OS
with RHEL 5.1/5.2. I compiled xen 3.2 with vmxassist=n as suggested in
bug 622. After I installed and booted this xen kernel I have
difficulty
in starting the VMManager to create guest OS.
Could anyone please provide details on which Linux OS & the
tools I may use to install FreeBSD as guest.
I also tried with the instructions @
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/virtualization
-guest.html with kernel7.0-Release and kernel8.0-current. With both of
them I get a crash on doing xm create xmexample1.bsd -c. The trace is
below :
(XEN) Unhandled page fault in domain 1 on VCPU 0 (ec=0002)
(XEN) Pagetable walk from 00000472:
(XEN) L2[0x000] = 00000000 ffffffff
(XEN) domain_crash_sync called from entry.S (ff157619)
(XEN) Domain 1 (vcpu#0) crashed on cpu#1:
(XEN) ----[ Xen-3.0.4-1 x86_32 debug=n Not tainted
]----
(XEN) CPU: 1
(XEN) EIP: e019:[<c0458a30>]
(XEN) EFLAGS: 00000202 CONTEXT: guest
b cr4: 000026d0 cr3: 0d873000 cr2: 00000472
(XEN) ds: e021 es: e021 fs: e021 gs: e021 ss:
e021 cs: e019
(XEN) Guest stack trace from esp=c0c4fff0:
(XEN) 00000002 c0458a30 0001e019 00010002
(XEN) Unhandled page fault in domain 2 on VCPU 0
(ec=0002)
(XEN) Pagetable walk from 00000472:
(XEN) L2[0x000] = 00000000 ffffffff
(XEN) domain_crash_sync called from entry.S (ff157619)
(XEN) Domain 2 (vcpu#0) crashed on cpu#1:
(XEN) ----[ Xen-3.0.4-1 x86_32 debug=n Not tainted
]----
(XEN) CPU: 1
(XEN) EIP: e019:[<c0458a30>]
(XEN) EFLAGS: 00000202 CONTEXT: guest
(XEN) eax: 00000000 ebx: 00000000 ecx: 00000000
edx: 00000000
(XEN) esi: c0c47000 edi: 00000000 ebp: 00000000
esp: c0c4fff0
(XEN) cr0: 8005003b cr4: 000026d0002 c0458a30 0001e019
00010002
Unhandled page fault in domain 2llllllINIT: Switching to
runlevel: 0
Thanks in advance. Your help is highly appreciated.
Regards,
Sumant
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Igor
Chubin
Sent: Thursday, February 07, 2008 10:37 AM
To: Keir.Fraser@xxxxxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Loading FreeBSD in an HVM-domain on
Intel-basedhost with GRUB
The problem is solved.
Keir Fraser have said in Xen-devel mailing list
that the problem should not exist in the current xen-unstable
(since yesterday).
I have just built xen-unstable and really there is no problem
with usage of /boot/loader in an HVM domain even on a Intel-based
host.
So bug 622 does not exist anymore (at least for me).
Thank all and thank Keir again.
On Do, Feb 07, 2008 at 11:32:28 +0100, Oskar Lindgren wrote:
Hi,
Yes, it is possible. That is how I do it. But io under freebsd is
slow..
/ Oskar
Igor Chubin skrev:
Hello all,
please tell me,
is it possible (at least theoretically) to circumvent bug 622 [1] by
using
GRUB instead of /boot/loader to load FreeBSD kernel?
Or it is silly idea: even if we bypass /boot/loader we will not be
able
to run FreeBSD kernel in a HVM-domain on a Intel-based host for some
other reason?
As far as I know, GRUB can't load FreeBSD kernel
directly, but only can make chainloading using /boot/loader.
Certainly, it is not the solution, but there were patches
to GRUB that allow to boot FreeBSD directly [2].
I want to try to use it and eliminate /boot/loader
from boot process at all.
What can you say about this idea?
[1] http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=622
[2] http://savannah.gnu.org/bugs/?10728
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