I tought that the members of this forums would be interested in these two links.
Tweak kernel variables in sysctl.conf « Overtone
and
I have used the trick described in these articles to configure my system, I have only edited sysctl.conf to apply to my network settings and I have noticed a dramatic improvement with my net connection and speed. I was wondering if any other forum member had a trick up his sleeve about how to tweak opensuse/sysctl
I am sharing this in hopes that it interest someone and helps, but I can give no guarantees that this will work for you or wont break your system!
Here is my sysctl.conf for those interested.
Disable response to broadcasts.
You don’t want yourself becoming a Smurf amplifier.
net.ipv4.icmp_echo_ignore_broadcasts = 1
enable route verification on all interfaces
net.ipv4.conf.all.rp_filter = 1
enable ipV6 forwarding
#net.ipv6.conf.all.forwarding = 1
increase the number of possible inotify(7) watches
fs.inotify.max_user_watches = 65536
avoid deleting secondary IPs on deleting the primary IP
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.all.promote_secondaries = 1increase TCP max buffer size setable using setsockopt()
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216increase Linux autotuning TCP buffer limits
min, default, and max number of bytes to use
set max to at least 4MB, or higher if you use very high BDP paths
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216don’t cache ssthresh from previous connection
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_moderate_rcvbuf = 1recommended to increase this for 1000 BT or higher
net.core.netdev_max_backlog = 2500
for 10 GigE, use this, uncomment below
net.core.netdev_max_backlog = 30000
Turn off timestamps if you’re on a gigabit or very busy network
Having it off is one less thing the IP stack needs to work on
#net.ipv4.tcp_timestamps = 0
disable tcp selective acknowledgements.
net.ipv4.tcp_sack = 0
#enable window scaling
net.ipv4.tcp_window_scaling = 1
#drop icmp requests for total stealth
net.ipv4.icmp_echo_ignore_all = 1
#disable broadcasting
net.ipv4.icmp_echo_ignore_broadcasts = 1Disable ICMP Redirect Acceptance
#for IPv4
net.ipv4.conf.all.accept_redirects = 1
net.ipv4.conf.all.send_redirects = 1
#Ipv4 at interface level
net.ipv4.conf.eth0.accept_redirects = 1
net.ipv4.conf.eth0.send_redirects = 1
#tcp congestion
net.ipv4.tcp_reordering = 20
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_congestion_control = cubicIncrease the tcp-time-wait buckets pool size
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.tcp_rfc1337 = 1
net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_ecn = 0
net.ipv4.route.flush = 1
#Prevent SYN attack by enabling TCP/IP SYN cookies
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 2048
net.ipv4.tcp_synack_retries = 2Disables IP source routing
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.lo.accept_source_route = 0
net.ipv4.conf.eth0.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0Enable IP spoofing protection, turn on source route verification
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.lo.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1Enable Log Spoofed Packets, Source Routed Packets, Redirect Packets
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.lo.log_martians = 1
net.ipv4.conf.eth0.log_martians = 1Enable bad error message Protection
net.ipv4.icmp_ignore_bogus_error_responses = 1
Set maximum amount of memory allocated to shm to 256M
kernel.shmmax = 268435456
Increase the maximum memory used to reassemble IP fragments
net.ipv4.ipfrag_high_thresh = 512000
net.ipv4.ipfrag_low_thresh = 446464Increase the maximum amount of option memory buffers
net.core.optmem_max = 57344
I have not yet tried any “serious” tweaks regarding the memory, such as setting swappiness. Any options and thoughts are appreciated.
one cuz this guy from the link you priveded has tested this on ubuntu 7.04. its like you try to tweak your windows 7 with guid of windows XP