[Users] Re: 4gb seg fixup - centos5 HN and VE, with Xen

[Aleksandar Ivanisevic]

"Max Vohra" <maxv at corp.spry.com> writes:

> In my experience, the 4gb fixup errors occur on a 64bit system with over 4GB
> of memory and a 32 bit dom0 kernel, with PAE enabled, and TLS enabled in the
> DomU. Moving /lib/tls to /lib/tls.disabled and running ldconfig in the domU
> should fix the warning, but threading will be SLOW.

well, I have 8 gigs of memory, 32bit dom0 and domU and tried renaming
tls.disabled trick although my /lib/tls directory in domU is empty.

It didn't work, the messages are still there.

The domU is running fine, have yet to measure if there is a
performance hit.

> --
> Max V.
>
> On Tue, Dec 2, 2008 at 6:29 AM, Aleksandar Ivanisevic <
> aleksandar at ivanisevic.de> wrote:
>
>> Henrik Holmboe <henrik at holmboe.se>
>> writes:
>>
>> > ++ 27/11/08 15:48 +0100 - Aleksandar Ivanisevic:
>> >>I have the same problem with the same setup, so at least it is
>> >>reproducible ;)
>> >
>> > Good to know. Do you experience any problem with a plain Xen domU
>> > (provided by Centos, and thus without OpenVZ)?
>>
>> Nothing out of the ordinary ;)
>>
>> >>Is this causing any real problems for you except messed up console and
>> >>syslog filling with useless messgaes?
>> >
>> > Not really. But as Marcin suggested I guess it degrades the performance.
>> > And I don't have a good feeling about it. :) I would of course
>> > appreciate if someone more knowledgeable would say if I need to worry.
>>
>> Right now I'm running one fully virtualized xen DomU without xen
>> kernel in it and I'm planning to switch to paravirt and compare
>> application performance.
>>
>> BTW I'm not sure which is the more stable/preferred way of running
>> xen+ovz: xen kernel without ovz in dom0 and then paravirt
>> ovzkernel-xen domU with VEs inside, or vice versa: ovzkernel-xen in
>> dom0 + a mix of VEs and DomUs running in dom0. I'll be trying the
>> former. mainly because its a smaller step in my environment.

-- 
To sto si frustriran, zavidan tko zna na cemu i sto ne vidis dalje od
svoje guzice je tuzno. Da onda barem imas toliko samokontrole da
sutis umjesto da pravis budalu od sebe... izgleda da si prestar da se
promjenis na bolje. - Davor Pasaric, hr.comp.mac