in combination with courier-imap: severe performance problems

[Lorenz Weber]

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)

[Lorenz Weber (phry)]

PS: I did no testing to confirm this, but I suspect that other software compiled against libgnutls26 will show similar performance issues.

[Lorenz Weber (phry)]

seems the attachment was lost on bug submission

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "patch extracted from 2.12.16" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]