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Re: [Xen-devel] nptl status?

To: Stuart Jansen <sjansen@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] nptl status?
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
Date: Tue, 30 Nov 2004 02:23:58 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx, Ian.Pratt@xxxxxxxxxxxx
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> I read, I think on the Xen Web site, that Xen doesn't support NPTL yet.
> Digging through the Xen mailing list a few days ago, I saw a message
> that implied it is working now. What is the current status of NPTL in
> Xen? Out of curiosity, if it is not yet supported, what would be needed
> to support it? How hard would it be for a person with zero Xen
> experience to ramp up and work on adding NPTL support?

NPTL is supported, but we're forced to take traps for almost
every attempt to access thread local storage, which is slow (I
think Rik said 12-15% on a kernel compile).

The only way to improve on this would be to have our own very
slightly modified version of libc that could be installed to
restore full performance. We're hoping to look into this at some

Disabling NPTL works for most people.


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