sysctl.conf: Revert enabling busy loop waiting on sockets

[people/pmueller/ipfire-2.x.git] / config / etc / sysctl.conf

diff --git a/config/etc/sysctl.conf b/config/etc/sysctl.conf
index 011c4287ea04f7194548ac9a27e88b9e2701bf53..9a943fffa886430d4d45078f19f5b3dbc796bbb6 100644 (file)
--- a/config/etc/sysctl.conf
+++ b/config/etc/sysctl.conf
@@ -1,9 +1,6 @@
 net.ipv4.ip_forward = 1
 net.ipv4.ip_dynaddr = 1
 
-# Disable Path MTU Discovery
-net.ipv4.ip_no_pmtu_disc = 1
-
 net.ipv4.icmp_echo_ignore_broadcasts = 1
 net.ipv4.icmp_ignore_bogus_error_responses = 1
 net.ipv4.icmp_ratelimit = 1000
@@ -27,7 +24,6 @@ net.ipv4.conf.all.accept_source_route = 0
 net.ipv4.conf.all.log_martians = 1
 
 kernel.printk = 1 4 1 7
-vm.swappiness=0
 vm.mmap_min_addr = 4096
 vm.min_free_kbytes = 8192
 
@@ -44,7 +40,45 @@ net.bridge.bridge-nf-call-iptables = 0
 net.bridge.bridge-nf-call-arptables = 0
 
 # Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
-kernel.kptr_restrict = 1
+kernel.kptr_restrict = 2
 
 # Avoid kernel memory address exposures via dmesg.
 kernel.dmesg_restrict = 1
+
+# Minimal preemption granularity for CPU-bound tasks:
+# (default: 1 msec#  (1 + ilog(ncpus)), units: nanoseconds)
+kernel.sched_min_granularity_ns = 10000000
+
+# If a workload mostly uses anonymous memory and it hits this limit, the entire
+# working set is buffered for I/O, and any more write buffering would require
+# swapping, so it's time to throttle writes until I/O can catch up.  Workloads
+# that mostly use file mappings may be able to use even higher values.
+#
+# The generator of dirty data starts writeback at this percentage (system default
+# is 20%)
+vm.dirty_ratio = 10
+
+# Start background writeback (via writeback threads) at this percentage (system
+# default is 10%)
+vm.dirty_background_ratio = 3
+
+# The swappiness parameter controls the tendency of the kernel to move
+# processes out of physical memory and onto the swap disk.
+# 0 tells the kernel to avoid swapping processes out of physical memory
+# for as long as possible
+# 100 tells the kernel to aggressively swap processes out of physical memory
+# and move them to swap cache
+vm.swappiness = 1
+
+# The total time the scheduler will consider a migrated process
+# "cache hot" and thus less likely to be re-migrated
+# (system default is 500000, i.e. 0.5 ms)
+kernel.sched_migration_cost_ns = 5000000
+
+# Increase kernel buffer size maximums
+net.ipv4.tcp_rmem = 4096 87380 16777216
+net.ipv4.tcp_wmem = 4096 16384 16777216
+net.ipv4.udp_mem = 3145728 4194304 16777216
+
+# Enable TCP fast-open
+net.ipv4.tcp_fastopen = 3