4gb seg fixup, process on FC6 domU

[Karl Guenther]

Hi,

I have read through the threads on the 4gb seg fixup.  Both Xen and 
beagle are important to me for day to day use.

I boot into FC6 Xen and beagle seems to work but I am not sure what the 
4gb seg fixup messages are all about.  Are they just warning messages?

Is anything failing that I should know about as a user of both Xen and 
beagle?

Thank You

Karl Guenther

[itamar]

install kernel-xen on domU using a RPMS, will fix your problem.

--------------------

Itamar Reis Peixoto

e-mail: itamar(a)ispbrasil.com.br
msn: itamarjp(a)starmedia.com
skype: itamarjp 
icq: 81053601
[phone]
[phone]
----- Original Message ----- 
From: "Karl Guenther" <karl(a)guentherk.net&gt;
To: "Fedora-xen" <fedora-xen(a)redhat.com&gt;
Sent: Monday, January 15, 2007 6:12 PM
Subject: [Fedora-xen] 4gb seg fixup, process on FC6 domU


>  Hi,
>  
>  I have read through the threads on the 4gb seg fixup.  Both Xen and 
>  beagle are important to me for day to day use.
>  
>  I boot into FC6 Xen and beagle seems to work but I am not sure what the 
>  4gb seg fixup messages are all about.  Are they just warning messages?
>  
>  Is anything failing that I should know about as a user of both Xen and 
>  beagle?
>  
>  Thank You
>  
>  Karl Guenther
>  
>  --
>  Fedora-xen mailing list
>  Fedora-xen(a)redhat.com
>  https://www.redhat.com/mailman/listinfo/fedora-xen
>

[Kenneth Tanzer]

>  install kernel-xen on domU using a RPMS, will fix your problem. 
Can you explain why this would fix the problem, or what the problem is?  
IIRC, domU is terminology for a guest Xen machine (with dom0 being the 
host).  In my case, I was running a xen kernel (dom0), but not running 
any guest machines, so I don't have a domU that would come into play.

Thanks!

Ken

[itamar]

this is a warning about glibc

to stop messages on console

echo "hwcap 0 nosegneg" > /etc/ld.so.conf.d/nosegneg.conf

or install kernel-xen on domU


--------------------

Itamar Reis Peixoto

e-mail: itamar(a)ispbrasil.com.br
msn: itamarjp(a)starmedia.com
skype: itamarjp
icq: 81053601
[phone]
[phone]
----- Original Message ----- 
From: "Ken Tanzer" <ktanzer(a)desc.org&gt;
To: "Itamar Reis Peixoto" <itamar(a)ispbrasil.com.br&gt;
Cc: "Karl Guenther" <karl(a)guentherk.net>; "Fedora-xen" 
<fedora-xen(a)redhat.com&gt;
Sent: Tuesday, January 16, 2007 6:30 PM
Subject: Re: [Fedora-xen] 4gb seg fixup, process on FC6 domU


> > install kernel-xen on domU using a RPMS, will fix your problem.
>
>  Can you explain why this would fix the problem, or what the problem is?
>  IIRC, domU is terminology for a guest Xen machine (with dom0 being the
>  host).  In my case, I was running a xen kernel (dom0), but not running
>  any guest machines, so I don't have a domU that would come into play.
>
>  Thanks!
>
>  Ken
>
>

[Daniel P. Berrange]

On Mon, Jan 15, 2007 at 02:12:40PM -0600, Karl Guenther wrote:
>  Hi,
>  
>  I have read through the threads on the 4gb seg fixup.  Both Xen and 
>  beagle are important to me for day to day use.
>  
>  I boot into FC6 Xen and beagle seems to work but I am not sure what the 
>  4gb seg fixup messages are all about.  Are they just warning messages? 
Yes, there're merely warnings. They indicate that the Mono virtual machine
is using -ve segment addressing, which forces Xen to jump through some
nasty hoops. This in turn causes bad performance for the app in question.
GLibC used to have the same problem, but has been fixed to not do this
kind of -ve segment addressing when run on Xen. Mono is still using the
slow way :-(

Dan.
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