RE: 46% performance drop with change in glibc

[Jeremy Katz <katzj@redhat.com>]

On Tue, 2005-11-08 at 13:17 +0000, Ian Pratt wrote:
>  > >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.
> 
> Perhaps we should have the install script insert a file called
> /etc/ld.so.conf.d/xen containing "hwcap 0 nosegneg" ?

Sounds sane.  As Uli said, this mirrors what happens when our xen kernel
package is installed.

Jeremy