Bug 877421

Summary:	gnutls: linking against GNUTLS activates multi-threaded algorithms
Product:	[Fedora] Fedora	Reporter:	Florian Weimer <fweimer>
Component:	gnutls	Assignee:	Nikos Mavrogiannopoulos <nmavrogi>
Status:	CLOSED DEFERRED	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	jorton, nmavrogi, tmraz
Target Milestone:	---	Keywords:	FutureFeature
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Fixed In Version:		Doc Type:	Enhancement
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Last Closed:	2013-12-05 10:36:31 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Florian Weimer 2012-11-16 13:40:16 UTC

GNUTLS pulls in libpthread, thereby forcing malloc and libstdc++ reference counting (which affects std::string and std::(tr1::)shared_ptr) to use atomic operations.  For some loads, this has a measurable performance impact.

This is unnecessary because GNUTLS does not create threads on its own, and the mutex functions it needs are available in libc proper.

(I saw this with gnutls-2.12.17-1.fc17.)

Comment 1 Fedora End Of Life 2013-07-04 04:05:13 UTC

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Comment 2 Florian Weimer 2013-07-04 08:03:43 UTC

Still present in gnutls-3.1.11-1.fc19.x86_64 (same version as in rawhide).

Comment 3 Nikos Mavrogiannopoulos 2013-11-26 16:18:55 UTC

There are two issues here. One gnutls links to librt -mainly for clock_gettime() and librt links to pthreads. Since new glibc include clock_gettime, this is no longer needed, thus the issue can be fixed within gnutls.

The second issue is linking with p11-kit which also links with pthreads (for mutex_lock and this can also be avoided). I'll try to handle both the issues in rawhide.

Comment 4 Nikos Mavrogiannopoulos 2013-12-05 10:36:31 UTC

After some research it seems that this is unlikely to be fixed. GnuTLS is linked to p11-kit which uses the pthread library.

Comment 5 Florian Weimer 2013-12-05 10:40:44 UTC

(In reply to Nikos Mavrogiannopoulos from comment #4)
> After some research it seems that this is unlikely to be fixed. GnuTLS is
> linked to p11-kit which uses the pthread library.

There is bug 985495 for that.

Comment 6 Nikos Mavrogiannopoulos 2013-12-05 11:08:43 UTC

Let's postpone that issue then until a solution in p11-kit can be implemented.