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To answer the original question, Xen does not yet support NPTL.
Posted Jul 28, 2005 13:02 UTC (Thu) by demon (guest, #31340)
As I don't use UML, I can't say if it does or not, though there might be similar concerns with it as to what had been cropping up with NPTL and Xen.
Posted Aug 3, 2005 0:13 UTC (Wed) by rimuhosting (guest, #31061)
As the parent says, Xen runs NPTL code OK - but a bit slower than other code. Apparently there is a patch to glibc for Xen guests that can improve the performance.
UML does not support NPTL right now. You typically need to just mv /lib/tls /lib/tls.broken to prevent apps using it. There is talk on the mailing lists of some modifications so that it will support NPTL in the future.
The main limitation that this all seems to create is with db4 which depends on NPTL for interprocess locking. e.g. this can affect subversion users, and the workaround is to use a file system backed repository instead.
--PeterRimuHosting - Xen/UML VPS Hosting
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