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