Tuning for Better Network Performance

I'm interested in finding out if I can improve on my existing network performance.
Can turning off the 12 bytes of timestamp really be a meaningful change for performance?
How do you tweak the RWIN in Linux exactly?

I've looked at these sites but don't feel comfortable without further advice.
http://www.psc.edu/networking/projects/tcptune/
I was unable to follow along with: http://www.linuxforums.org/forum/networking/124571-solved-changing-rwin-value.html

These are some suggestions:

These are some values inside the system:

Code:

$ sysctl -a | fgrep tcp
error: permission denied on key 'kernel.cad_pid'
error: permission denied on key 'fs.binfmt_misc.register'
error: permission denied on key 'dev.parport.parport0.autoprobe'
error: permission denied on key 'dev.parport.parport0.autoprobe0'
error: permission denied on key 'dev.parport.parport0.autoprobe1'
error: permission denied on key 'dev.parport.parport0.autoprobe2'
error: permission denied on key 'dev.parport.parport0.autoprobe3'
error: permission denied on key 'net.ipv4.route.flush'
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_retrans_collapse = 1
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 5
net.ipv4.tcp_max_orphans = 32768
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_keepalive_time = 7200
net.ipv4.tcp_keepalive_probes = 9
net.ipv4.tcp_keepalive_intvl = 75
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 15
net.ipv4.tcp_fin_timeout = 60
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_abort_on_overflow = 0
net.ipv4.tcp_stdurg = 0
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_max_syn_backlog = 1024
net.ipv4.tcp_orphan_retries = 0
net.ipv4.tcp_fack = 1
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_dsack = 1
net.ipv4.tcp_mem = 80832    107776    161664
net.ipv4.tcp_wmem = 4096    16384    3448832
net.ipv4.tcp_rmem = 4096    87380    3448832
net.ipv4.tcp_app_win = 31
net.ipv4.tcp_adv_win_scale = 2
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_frto = 2
net.ipv4.tcp_frto_response = 0
net.ipv4.tcp_low_latency = 0
net.ipv4.tcp_no_metrics_save = 0
net.ipv4.tcp_moderate_rcvbuf = 1
net.ipv4.tcp_tso_win_divisor = 3
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_abc = 0
net.ipv4.tcp_mtu_probing = 0
net.ipv4.tcp_base_mss = 512
net.ipv4.tcp_workaround_signed_windows = 0
net.ipv4.tcp_dma_copybreak = 4096
net.ipv4.tcp_slow_start_after_idle = 1
net.ipv4.tcp_available_congestion_control = cubic reno
net.ipv4.tcp_allowed_congestion_control = cubic reno
net.ipv4.tcp_max_ssthresh = 0
net.ipv4.tcp_cookie_size = 0
net.ipv4.tcp_thin_linear_timeouts = 0
net.ipv4.tcp_thin_dupack = 0
error: permission denied on key 'net.ipv6.route.flush'

 

Don't go there. If you really don't know the impact of all those, the chances are fairly high you will screw things. And the best way to improve your network performance is a good isp and decent bandwidth.
Mrk

 

Thanks for the warning.
I've already changed these settings and have achieved 150+kb/s improvement. It's not permanent so all will revert when I reboot.
How do I optamize? Should all four listed below be the same value? Would different values be better?

Cheers