On 2011-11-08 22:59, Albe Laurenz wrote:
> In addition to the oprofile data I collected three times:
> - the duration as shown in the server log
> - the duration as shown by \timing
> - the duration of the psql command as measured by "time"
[...]
> I think this makes a good case for disabling compression.
It's a few data points, but is it enough to make a good case? As I
understand it, compression can save time not only on transport but also
on the amount of data that needs to go through encryption -- probably
depending on choice of cypher, hardware support, machine word width,
compilation details etc. Would it make sense to run a wider experiment,
e.g. in the buld farm?
Another reason why I believe compression is often used with encryption
is to maximize information content per byte of data: harder to guess,
harder to crack. Would that matter?
Jeroen
