SSL Compression doesn't work

Hi,
I try to reduce bandwith use with ssl and compression. I create a test with:

1. CentOS release 6.6 (Final )x86_64

a. openssl-1.0.1e-30.el6_6.4.x86_64

b. kernel-2.6.32-504.1.3.el6.x86_64

2. PostgreSQL 9.3.5

a. postgresql93-libs-9.3.5-1PGDG.rhel6.x86_64

b. postgresql93-contrib-9.3.5-1PGDG.rhel6.x86_64

c. postgresql93-9.3.5-1PGDG.rhel6.x86_64

d. postgresql93-server-9.3.5-1PGDG.rhel6.x86_64

I configure a postgresql with SSL (http://www.postgresql.org/docs/9.3/static/ssl-tcp.htm), with self-signed certificate.
All work fine for SSL, but when I try to use the compression I didn't find any difference monitoring traffic with tcdump.

These commands has the same network load (~1.1MB)

* psql "user=USER password=PASS host=HOST dbname=postgres sslmode=require sslcompression=1" -c "SELECT lpad('', 1024*1024, 'A');"

* psql "user=USER password=PASS host=HOST dbname=postgres sslmode=require sslcompression=0" -c "SELECT lpad('', 1024*1024, 'A');"

* psql "user=USER password=PASS host=HOST dbname=postgres sslmode=disable" -c "SELECT lpad('', 1024*1024, 'A');"

Best regards,
Edoardo Innocenti

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