Re: [Xen-devel] Re: NPTL/TLS "emulation" idea (fwd)

[Rik van Riel <riel@xxxxxxxxxx>]

On Wed, 20 Oct 2004, Keir Fraser wrote:

> Yes, so the answer is that we 'flip' about as often as the current
> code emulates (e.g., about 2.5 million flips/emulations to boot a Red
> Hat system).
>
> The performance is very bad, but the flipping code is both simpler and
> more robust than emulation so I will go with the new technique.

How bad is the performance?  A 10% performance penalty, 30% ?

> But I will still print a warning message from Linux to tell the user to
> remove /lib/tls.

I've heard that this will actually break some things, like
db4 locking and the RPM database consistency...

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan



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