# Members of group my-hugetlbfs(1001) can allocate "huge" Shared memory segment
vm.hugetlb_shm_group = 1001

fs.inotify.max_user_watches=524288

#https://blog.cloudflare.com/http-2-prioritization-with-nginx/
net.ipv4.tcp_notsent_lowat = 16384
net.core.default_qdisc = fq_codel
net.ipv4.tcp_congestion_control = bbr

#http://rudd-o.com/linux-and-free-software/tales-from-responsivenessland-why-linux-feels-slow-and-how-to-fix-that
vm.swappiness=1
vm.vfs_cache_pressure=50
vm.stat_interval=10

#from redhat's latency guide pdf
#https://access.redhat.com/sites/default/files/attachments/201501-perf-brief-low-latency-tuning-rhel7-v1.1.pdf
kernel.nmi_watchdog=0

#network stuff
net.core.busy_read=50
net.core.busy_poll=50
net.ipv4.tcp_fastopen=3
vm.dirty_ratio=10
vm.dirty_background_ratio=3

#https://sites.google.com/site/mytechnotesproject/home/announce/vmdirtyratioandvmdirtybackgroundratio
#vm.dirty_ratio=5
#vm.dirty_background_ratio=5

#https://github.com/hamadmarri/cacule-cpu-scheduler/issues/39
##Network-Settings
net.core.netdev_max_backlog = 16384
net.core.somaxconn = 8192
net.core.rmem_default = 1048576
net.core.rmem_max = 16777216
net.core.wmem_default = 1048576
net.core.wmem_max = 16777216
net.core.optmem_max = 65536
net.ipv4.tcp_rmem = 4096 1048576 2097152
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.udp_rmem_min = 8192
net.ipv4.udp_wmem_min = 8192
net.ipv4.tcp_keepalive_time = 60
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 6
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.all.log_martians = 1
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_syncookies = 1