Re: [Xen-users] 32 on 64bit

[Stephan Seitz <s.seitz@xxxxxxxxxxxx>]

Steffen Heil schrieb:
> Hi
>
> Since today I am using 32bit linux paravirt domains on a 64bit dom0 and
> 64bit hypervisor.
>
> My personal impression is that these 32bit domains are much slower than
> their 64bit counterparts.
>
> Can this be true? Can someone verify or falsify this?
This highly depends on the libc version your domU is running.
Make sure you've a xen-aware (aka nosegneg) libc installed.
On debianlike distros the package is libc6-xen.

If you're running an older distro or otherwise unable to setup
such a libc, a workaround is to remove /lib/tls. This is advertised
by Xen as move /lib/tls to /lib/tls.disabled
This has be done everytime the libc is updated.

As a "softer" alternative, you could first try to add
hwcap 0 nosegneg
to your /etc/ld.so.conf or (on newer versions) to a new
file in /etc/ld.so.conf.d/ (e.g. /etc/ld.so.conf.d/libc6-xen )


Cheers,

Stephan


> Regards,
>   Steffen
>
>
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