[Bug 1268193] [NEW] in combination with courier-imap: severe performance problems

[Lorenz Weber]

Public bug reported:

I compiled courier-mta (using the apt-get source/fakeroot method with
--with-gnutls as additional config flag) against gnutls and experienced
severe performance problems.

Testing shows that downloading a 10MB-attachment with the openssl library takes ~1.6 seconds, but ~60 seconds using the gnutls library.
More details and test methods are described in this mailing list thread: http://sourceforge.net/mailarchive/forum.php?thread_name=52CFECFC.5070300%40lenzw.de&forum_name=courier-imap

More investigation has shown that this bug does not apply with newer versions of gnutls, namely 2.12.16 fixes the issue.  (From 60s down to 1.5s)
I am attaching a patch which resolves the problem when applied to gnutls26_2.12.14-5ubuntu3.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libgnutls26 2.12.14-5ubuntu3.5
Uname: Linux 3.10.13-x86_64-jb1 x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Sat Jan 11 21:01:25 2014
MarkForUpload: True
SourcePackage: gnutls26
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: gnutls26 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1268193

Title:
  in combination with courier-imap: severe performance problems

Status in “gnutls26” package in Ubuntu:
  New

Bug description:
  I compiled courier-mta (using the apt-get source/fakeroot method with
  --with-gnutls as additional config flag) against gnutls and
  experienced severe performance problems.

  Testing shows that downloading a 10MB-attachment with the openssl library takes ~1.6 seconds, but ~60 seconds using the gnutls library.
  More details and test methods are described in this mailing list thread: http://sourceforge.net/mailarchive/forum.php?thread_name=52CFECFC.5070300%40lenzw.de&forum_name=courier-imap

  More investigation has shown that this bug does not apply with newer versions of gnutls, namely 2.12.16 fixes the issue.  (From 60s down to 1.5s)
  I am attaching a patch which resolves the problem when applied to gnutls26_2.12.14-5ubuntu3.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libgnutls26 2.12.14-5ubuntu3.5
  Uname: Linux 3.10.13-x86_64-jb1 x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Sat Jan 11 21:01:25 2014
  MarkForUpload: True
  SourcePackage: gnutls26
  UpgradeStatus: No upgrade log present (probably fresh install)

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