kernel_tuning
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kernel_tuning [2011/12/22 14:40] k2patel [###### Optimization Dec. 22 2011 ######] |
kernel_tuning [2020/08/10 02:35] |
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| - | ====== Kernel Tuning ====== | ||
| - | This tuning i have used for dedicated DB server.\\ | ||
| - | You can use it, as it is on any modern server, but please make sure to read note once.\\ | ||
| - | |||
| - | ==== ###### Optimization Dec. 22 2011 ###### ==== | ||
| - | |||
| - | |||
| - | === ## Reduce Swapping === | ||
| - | <code bash> | ||
| - | vm.swappiness = 30 | ||
| - | vm.dirty_ratio = 50 | ||
| - | vm.dirty_background_ratio = 5 | ||
| - | </code> | ||
| - | === ## Prevent Syn Attack === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_syncookies = 1 | ||
| - | net.ipv4.tcp_syn_retries = 5 | ||
| - | net.ipv4.tcp_synack_retries = 2 | ||
| - | net.ipv4.tcp_max_syn_backlog = 4096 | ||
| - | </code> | ||
| - | === ## Enable IP Spoofing Protection === | ||
| - | <code bash> | ||
| - | net.ipv4.conf.all.rp_filter = 1 | ||
| - | net.ipv4.conf.default.rp_filter = 1 | ||
| - | </code> | ||
| - | === ## Decrease tcp fin timeout === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_fin_timeout = 15 | ||
| - | </code> | ||
| - | === ## Decrease the time default value for keep alive === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_keepalive_time = 300 | ||
| - | net.ipv4.tcp_keepalive_probes = 5 | ||
| - | net.ipv4.tcp_keepalive_intvl = 15 | ||
| - | </code> | ||
| - | === ## Enable Fix for RFC1337 === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_rfc1337 = 1 | ||
| - | </code> | ||
| - | |||
| - | <note warning> | ||
| - | ## Not for Low memory system | ||
| - | </note> | ||
| - | |||
| - | === ## Increase Read Buffer === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_rmem = 8192 87380 16777216 | ||
| - | net.ipv4.udp_rmem_min = 16384 | ||
| - | net.core.rmem_default = 131072 | ||
| - | net.core.rmem_max = 16777216 | ||
| - | </code> | ||
| - | === ## Increase Write Buffer === | ||
| - | <code bash> | ||
| - | net.ipv4.tcp_wmem = 8192 65536 16777216 | ||
| - | net.ipv4.udp_wmem_min = 16384 | ||
| - | net.core.wmem_default = 131072 | ||
| - | net.core.wmem_max = 16777216 | ||
| - | </code> | ||
| - | === ## Increase Number of incocimng connections === | ||
| - | <code bash> | ||
| - | net.core.somaxconn = 32768 | ||
| - | </code> | ||
| - | === ## Increase max buffer for con. === | ||
| - | <code bash> | ||
| - | net.core.optmem_max = 65536 | ||
| - | </code> | ||
| - | === ## Increase TCP queue lenght === | ||
| - | <code bash> | ||
| - | net.ipv4.neigh.default.proxy_qlen = 96 | ||
| - | net.ipv4.neigh.default.unres_qlen = 6 | ||
| - | </code> | ||
| - | === ## increase slots for tcp / udp === | ||
| - | <code bash> | ||
| - | sunrpc.tcp_slot_table_entries = 32 | ||
| - | sunrpc.udp_slot_table_entries = 32 | ||
| - | </code> | ||
| - | === ## increase uRPC datagram queue lenght === | ||
| - | <code bash> | ||
| - | net.unix.max_dgram_qlen = 50 | ||
| - | </code> | ||
kernel_tuning.txt ยท Last modified: 2020/08/10 02:35 (external edit)
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