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

To: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] 46% performance drop with change in glibc
From: Andrew Theurer <habanero@xxxxxxxxxx>
Date: Tue, 8 Nov 2005 09:57:05 -0500
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Ulrich Drepper <drepper@xxxxxxxxxx>, Robert Read <robert@xxxxxxxxxxxxx>
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On Tuesday 08 November 2005 07:17, 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" ?

Assuming most/all distros are doing it this way.  I do recall a beta version 
of openSUSE just moved the tls dir in an rc script, but maybe they are doing 
something different now.  Anyone involved with Linux distributions care to 
comment?

-Andrew

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