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

[Andrew Theurer <habanero@xxxxxxxxxx>]

Ian Pratt wrote:

> > > > 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.
> > I am not seeing this patch in ./patches/linux-2.6.12 
> > directory.  Is it somewhere else?
> It should be in the main tree. The appended patch was included some time
> ago, but I've never tested it to see whether it works since I don't
> generally run bleeding edge Fedora.
>
> Is there some piece of the patch missing?
No, it's all there.  Only part I needed was the change to ld.so.conf.  
So, anyone with FC4, you might want to make sure you have the entry 
"hwcap 0 nosegneg".  It looks like the performance regression has 
disappeared now.  Thanks all for you help.
-Andrew


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