[gnutls-help] gnutls + courier-imap => very slow

Daniel Kahn Gillmor dkg at fifthhorseman.net
Fri Jan 10 06:37:35 CET 2014

On 01/09/2014 11:46 PM, Sam Varshavchik wrote:
> Lenz Weber writes:
>> I'm currently investigating some serious performance problems when using
>> courier-0.66.1ubuntu4 in combination with
>> gnutls-3.0.11+really2.12.14-5ubuntu3.5, which would be the usual
>> combination if one were to compile courier using the --with-gnutls
>> config flag in the lastest Ubuntu LTS version 12.04.
> However, I happened to have sources of 3.2.7 handy, and from poking
> around, those syscalls appear to be coming out of
> wrap_nettle_rnd_refresh() in lib/nettle/rnd.c, which appears to have
> something to do with reseeding an internal random number pool. It looks
> like there's a lot of work happening here; and I don't quite follow why
> that needs to be done for each call to gnutls_record_send(); but that's
> as far as I could go, with what I know.

the ubuntu version Lenz mentioned is "really2.12.14", which means it's
built against gcrypt, not nettle, iiuc.  sorry i don't have more help to
offer on this at the moment, but just wanted to avoid anyone doing a
goose chase down into the nettle code for this situation.


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