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Re: [Xen-users] how to find out whether glibc is XEN-ready or not

from [Mark Williamson]

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Subject:	Re: [Xen-users] how to find out whether glibc is XEN-ready or not
From:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date:	Tue, 4 Apr 2006 17:56:09 +0100
Cc:	"Stephen C. Tweedie" <sct@xxxxxxxxxx>, Ulf Behrens <ulf.behrens@xxxxxxx>
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> I can't speak for the SuSE package, but on FC5 glibc picks up the right
> TLS version automatically too.  You can check it's working with
>
>       $ cat /proc/self/maps
>
> which on my local i386 dom0 shows:
>
>                 /lib/i686/nosegneg/libc-2.4.so
>
> as the libc in use, showing it is detecting and using the "nosegneg"
> Xen-friendly version automatically.  SuSE may well be using a similar
> scheme.

IIRC, SuSE's TLS just never uses negative segment references, even on native - 
I understood they didn't find the performance advantages justified the extra 
complexity switching for Xen-vs-native.

Cheers,
Mark

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