Re: Re: CentOS5 virtual machine image

Am Freitag, den 26.01.2007, 13:29 -0700 schrieb Bernard
Johnson:
> Nils Toedtmann wrote:
> > I agree. But customization of C4 (and probably C3,
too) to run smoothly
> > as a VM is a bit evil (i run a bunch of productive
C4 DomUs, so walked
> > through that valley ...): glibc and db4 have to be
patched/rebuilt
> > because of NPTL incompatibilities. 
> 
> I agree that C3 would be a problem - both guest and
host.
> 
> However, for C4 I have a "installer hack"
that allows C4 to install
> under Xen (FC6 host) using virt-manager &
kickstart.  When it's
> finished, the only package that is modified is the
kernel (to provide a
> domU image).
> 
> Perhaps your VM is the issue with tls. 

Among other things: yes.

> Once I started using a recent
> enough host (FC6) and a recent enough guest (C4), all
my tls problems
> disappeared. 

I guess they did not disappear but got hidden. AFAIK
(correct me if i am
wrong) recent xen versions have a hack to workaround
TLS-libs silently,
but there is still a performance penalty. And the db4-prob
ist still
there: install and start cyrus-imapd on C4 under xen/FC6. If
the maillog
does not fill up with DBERROR, i owe you a beer.

/nils.

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Nils Toedtmann wrote:
> I guess they did not disappear but got hidden. AFAIK
(correct me if i am
> wrong) recent xen versions have a hack to workaround
TLS-libs silently,
> but there is still a performance penalty. 

That was not my understanding, however you may be right. 
Can you point
me to documentation as to what the workaround actually does?
 And what
performance penalty we might be paying?

> And the db4-prob ist still
> there: install and start cyrus-imapd on C4 under
xen/FC6. If the maillog
> does not fill up with DBERROR, i owe you a beer.

xen host: FC6, guest: CentOS 4.4

verified - no problem

I will let you off easy on the beer.  Instead of sending
across the
ocean, you can send it to my hotel in Switzerland in 2 weeks
;)

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Nils Toedtmann wrote:
> I guess they did not disappear but got hidden. AFAIK
(correct me if i am
> wrong) recent xen versions have a hack to workaround
TLS-libs silently,
> but there is still a performance penalty. 

Do you have some numbers to elaborate on the point of
performance loss ?

- KB
-- 
Karanbir Singh : http://www.karan.org/ :
2522219icq
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