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Steve Thompson | 1 Jan 03:44

RE: Question about /gplpv

On Wed, 31 Dec 2008, Venefax wrote:

> I can confirm now the only remaining issue with the GPLPV drivers: the
> windows virtual machines do not reboot, the domains must be destroyed and
> restarted.

I'm a Xen PV Drivers noob: I installed 0.9.12-pre13.exe for the first time 
about five days ago, and I don't have this problem with either Windows XP 
or Windows 2003 guests; a reboot works fine. I also note that I did the 
install before I saw the docs comment about xen-3.0.3 in Dom0 supposedly 
not working; I have xen-3.0.3 on a CentOS 5.2 x86_64 Dom0 and it works 
well for me. The increase in guest performance is outstanding.

Steve
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Boris Derzhavets | 1 Jan 11:52
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Re: xen 3.3.0 crash problems

Take a look at xend.log.
Through my experience back port Intrepid Xen 3.3 Hypervisor
to Hardy Dom0 works fine. How you made Xen 3.3.0 port to Hardy ?

--- On Thu, 1/1/09, Swapna Shingre <swaps_138 <at> yahoo.com> wrote:
From: Swapna Shingre <swaps_138 <at> yahoo.com>
Subject: [Xen-users] xen 3.3.0 crash problems
To: xen-users <at> lists.xensource.com
Date: Thursday, January 1, 2009, 4:02 AM

Hello,
I am using xen 3.3.0 on ubuntu 8.04.. I compiled the xen source with linux-2.6.18-xen.hg as guest. But I am experiencing crashes after 10 to 15 minutes. What may be the reason?

Please help.
-Swapna

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morten | 1 Jan 14:15
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Large server, Xen limitations

Hi,

we're contemplating getting a large new server, where we will run a number
of
virtual servers.  Are there any things we need to keep in mind in that
case?  Are
there limitations on what a Xen system can manage?

We're talking about a 4 x Quad core CPU server with 64 GBs of RAM and a
couple of terabytes of RAIDed SATA storage.

-Morten 

(Re-sending this, as the first message didn't seem to go through.)
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Nicolas Daneau | 1 Jan 15:05
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Re: Large server, Xen limitations

Hi,

Up to what I know, there are no limitation for Xen. Let enjoy you
large new server!

Nico

2009/1/1  <morten <at> nidelven-it.no>:
> Hi,
>
> we're contemplating getting a large new server, where we will run a number
> of
> virtual servers.  Are there any things we need to keep in mind in that
> case?  Are
> there limitations on what a Xen system can manage?
>
> We're talking about a 4 x Quad core CPU server with 64 GBs of RAM and a
> couple of terabytes of RAIDed SATA storage.
>
> -Morten
>
> (Re-sending this, as the first message didn't seem to go through.)
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users <at> lists.xensource.com
> http://lists.xensource.com/xen-users
>

--

-- 
Nicolas Daneau
   Rue Maurice Bertrand 543
   5300 Landenne
   0486/69.01.65
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DigiTech India Ltd | 1 Jan 15:26
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Xen domU does not boot after date sync

Hello,

After I've synced the date and time(which was around 10 hours ahead), the domU's wont boot up.
No response from SSH or ping.

When trying to login through console, it's stuck after this point:

Linux version 2.6.18-92.1.22.el5xen (mockbuild <at> builder16.centos.org) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Tue Dec 16 13:08:49 EST 2008
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000020800000 (usable)
0MB HIGHMEM available.
520MB LOWMEM available.
NX (Execute Disable) protection: active
ACPI in unprivileged domain disabled
Built 1 zonelists.  Total pages: 133120
Kernel command line:  root=/dev/sda1 ro
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
CPU 0 irqstacks, hard=c073d000 soft=c071d000
PID hash table entries: 4096 (order: 12, 16384 bytes)
Xen reported: 2210.058 MHz processor.
Console: colour dummy device 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Software IO TLB disabled
vmalloc area: e1000000-f4ffe000, maxmem 2d7fe000
Memory: 507904k/532480k available (2100k kernel code, 16036k reserved, 873k data, 176k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine..

Any help would be appreciated.

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Xen-users mailing list
Xen-users <at> lists.xensource.com
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Steve Thompson | 1 Jan 16:09

Re: Large server, Xen limitations

On Thu, 1 Jan 2009, morten <at> nidelven-it.no wrote:

> we're contemplating getting a large new server, where we will run a 
> number of virtual servers.  Are there any things we need to keep in mind 
> in that case?  Are there limitations on what a Xen system can manage?
>
> We're talking about a 4 x Quad core CPU server with 64 GBs of RAM and a
> couple of terabytes of RAIDed SATA storage.

I have a 2 x quad core Dell PE2900 server with 24 GB memory and a couple 
of TB of RAID-1 SATA disk running CentOS 5.2 x86_64 and xen 3.0.3, and 
currently have 33 file-based guests running on it (mostly 32-bit and 
64-bit linux, some Windows). All guests have 1 vcpu and 512 MB memory. 
This setup has been running solidly for about 6 months. Some things I have 
noticed:

- HVM guests were a lot slower than PV guests, and there is a _lot_ of 
qemu-dm overhead on Dom0. In particular, 32-bit HVM guests were much 
slower than 64-bit HVM guests. Avoid HVM as much as possible, and if you 
can't (Windows), use the Xen PV drivers. My workload consists mostly of a 
software development environment, so I run a lot of make's (on Windows, 
under cygwin, sources and objects on Samba shares). I found that the Xen 
PV drivers on Windows improved performance by over three times (reduced 
one compilation from 6 hours to 100 minutes); Windows compile performance 
with cygwin is now about 80% of native speed.

- I converted most of my Linux guests to diskless guests with an NFS root, 
with the Dom0 as NFS server. Not only do the formerly-HVM guests run much 
faster, but they also run faster than file-based PV guests, and now 32-bit 
guests are a little faster than 64-bit guests (less stuff to read from 
NFS, I presume). The qemu-dm overhead on Dom0 is now essentially zero.

- With a large number of guests, you have to be more careful with their 
start/stop/start order to avoid the 'out of memory' error.

- Set xen.independent_wallclock on Linux guests if possible (Xen kernel), 
otherwise it will be next to impossible to keep the clocks in sync.

Steve
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Todd Deshane | 1 Jan 22:22
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Re: Problem booting xen domU Guest

On Wed, Dec 31, 2008 at 6:30 PM, Philipp <Xerberus999X <at> gmx.net> wrote:
> I´m trying to compile the new 2.6.28 vanilla kernel as domU guest. The kernel seems to work fine when I try
to boot with it by its own. But when I try to boot this kernel as domU, he cant seem to find any devices. I cant
seem to figure out where´s the problem. Any hints would be much appreciated.
>

Can you post your kernel config (either on a website, pastebin, or the
like)? That may help people be able to point to potential problems
quicker.

These wiki pages may give some information:
http://wiki.xensource.com/xenwiki/Kernel.org_Linux_on_Xen
http://wiki.xensource.com/xenwiki/XenParavirtOps

Hope that helps.

Cheers,
Todd

--

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com
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Philipp | 1 Jan 23:48
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Re: Problem booting xen domU Guest

Sure that. There ya go:

http://pastebin.com/m645174dd

I really have no idea what else to check. Tried almost anything I could think of.

-------- Original-Nachricht --------
> Datum: Thu, 1 Jan 2009 16:22:23 -0500
> Von: "Todd Deshane" <deshantm <at> gmail.com>
> An: Philipp <Xerberus999X <at> gmx.net>
> CC: xen-users <at> lists.xensource.com
> Betreff: Re: [Xen-users] Problem booting xen domU Guest

> On Wed, Dec 31, 2008 at 6:30 PM, Philipp <Xerberus999X <at> gmx.net> wrote:
> > I´m trying to compile the new 2.6.28 vanilla kernel as domU guest. The
> kernel seems to work fine when I try to boot with it by its own. But when I
> try to boot this kernel as domU, he cant seem to find any devices. I cant
> seem to figure out where´s the problem. Any hints would be much
> appreciated.
> >
> 
> Can you post your kernel config (either on a website, pastebin, or the
> like)? That may help people be able to point to potential problems
> quicker.
> 
> These wiki pages may give some information:
> http://wiki.xensource.com/xenwiki/Kernel.org_Linux_on_Xen
> http://wiki.xensource.com/xenwiki/XenParavirtOps
> 
> Hope that helps.
> 
> Cheers,
> Todd
> 
> -- 
> Todd Deshane
> http://todddeshane.net
> http://runningxen.com
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users <at> lists.xensource.com
> http://lists.xensource.com/xen-users
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Steve Thompson | 2 Jan 00:54

RE: Large server, Xen limitations (Offlist)

On Thu, 1 Jan 2009, Nathan Eisenberg wrote:

> XEN has the advantage of being free, but have you looked at Virtouzzo 
> containers?

Hi Nathan,

I haven't really looked at Virtuozzo containers in any depth, but it seems 
to me, at least on a cursory glance, that the guests have to run the same 
o/s as the host, which unfortunately rules it out for me. Otherwise it 
seems pretty neat. I have other customer requirements that I use xen (and 
later, VMware), so I don't really have too much choice right now.

Steve
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Todd Deshane | 2 Jan 01:18
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Re: Problem booting xen domU Guest

On Thu, Jan 1, 2009 at 5:48 PM, Philipp <Xerberus999X <at> gmx.net> wrote:
> Sure that. There ya go:
>
> http://pastebin.com/m645174dd
>
> I really have no idea what else to check. Tried almost anything I could think of.
>

Does it crash? Or does it come to a initramfs prompt?

When I get into a situation like this, I like to use all the debugging
and redirect
the output to a serial console

The basic idea of how to set it up is here:
http://en.opensuse.org/How_to_Capture_Xen_Hypervisor_and_Kernel_Messages_using_a_Serial_Cable

I don't think there is much of anything that is suse-specific there so
those should work well.

I don't see anything obvious that is wrong, but maybe with more
debugging output and/or
if someone else on this list gives it a look they will see something.

One really common problem is with the initial ram disk not having the
right modules included.

What is the base OS, and Xen version, etc.?

Cheers,
Todd

--

-- 
Todd Deshane
http://todddeshane.net
http://runningxen.com
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Gmane