RE: [Xen-devel] 46% performance drop with change in glibc

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> There is no tls subdir since NPTL is the default (and LT is 
> completely gone in FC5).  The code in /lib is the TLS code 
> using the correct ABI.
> 
> The crippled ABI is supported by the code in 
> /lib/i686/nosegneg.  This code is *automatically* used if the 
> kernel is compiled to match the glibc version.  This happens using the
> 
> linux-2.6-xen-vdso-note.patch

I believe we have this patch in the xen repo, but I haven't ever
verified whether the right thing happens under FC4.

Andrew: please could you check you have the xen glibc rpm installed and
verify that the glibc selection is working using one of our kernels. 

Thanks,
Ian

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