PROC TWEAK



  • Hi, have any try to tweak CPU tweak at boot?

    (You need to add those entries through the web GUI at System -> Advanced, click on the System Tunables tab) ?

    fs.file-max = 65535
    net.core.rmem_default = 262144
    net.core.rmem_max = 262144
    net.core.wmem_default = 262144
    net.core.wmem_max = 262144
    net.ipv4.tcp_rmem = 4096 87380 8388608
    net.ipv4.tcp_wmem = 4096 65536 8388608
    net.ipv4.tcp_mem = 4096 4096 4096
    net.ipv4.tcp_low_latency = 1
    net.core.netdev_max_backlog = 4000
    net.ipv4.ip_local_port_range = 1024 65000
    net.ipv4.tcp_max_syn_backlog = 16384



  • Or this:

    Increase size of file handles and inode cache

    fs.file-max = 2097152

    tells the kernel how many TCP sockets that are not attached to any

    user file handle to maintain. In case this number is exceeded,

    orphaned connections are immediately reset and a warning is printed.

    net.ipv4.tcp_max_orphans = 60000

    Do not cache metrics on closing connections

    net.ipv4.tcp_no_metrics_save = 1

    Turn on window scaling which can enlarge the transfer window:

    net.ipv4.tcp_window_scaling = 1

    Enable timestamps as defined in RFC1323:

    net.ipv4.tcp_timestamps = 1

    Enable select acknowledgments:

    net.ipv4.tcp_sack = 1

    Maximum number of remembered connection requests, which did not yet

    receive an acknowledgment from connecting client.

    net.ipv4.tcp_max_syn_backlog = 10240

    recommended default congestion control is htcp

    net.ipv4.tcp_congestion_control=htcp

    recommended for hosts with jumbo frames enabled

    net.ipv4.tcp_mtu_probing=1

    Number of times SYNACKs for passive TCP connection.

    net.ipv4.tcp_synack_retries = 2

    Allowed local port range

    net.ipv4.ip_local_port_range = 1024 65535

    Protect Against TCP Time-Wait

    net.ipv4.tcp_rfc1337 = 1

    Decrease the time default value for tcp_fin_timeout connection

    net.ipv4.tcp_fin_timeout = 15

    Increase number of incoming connections

    somaxconn defines the number of request_sock structures

    allocated per each listen call. The

    queue is persistent through the life of the listen socket.

    net.core.somaxconn = 1024

    Increase number of incoming connections backlog queue

    Sets the maximum number of packets, queued on the INPUT

    side, when the interface receives packets faster than

    kernel can process them.

    net.core.netdev_max_backlog = 65536

    Increase the maximum amount of option memory buffers

    net.core.optmem_max = 25165824

    Increase the maximum total buffer-space allocatable

    This is measured in units of pages (4096 bytes)

    net.ipv4.tcp_mem = 65536 131072 262144
    net.ipv4.udp_mem = 65536 131072 262144

    Set the max OS send buffer size (wmem) and receive buffer

    size (rmem) to 12 MB for queues on all protocols. In other

    words set the amount of memory that is allocated for each

    TCP socket when it is opened or created while transferring files

    Default Socket Receive Buffer

    net.core.rmem_default = 25165824

    Maximum Socket Receive Buffer

    net.core.rmem_max = 25165824

    Increase the read-buffer space allocatable (minimum size,

    initial size, and maximum size in bytes)

    net.ipv4.tcp_rmem = 20480 12582912 25165824
    net.ipv4.udp_rmem_min = 16384

    Default Socket Send Buffer

    net.core.wmem_default = 25165824

    Maximum Socket Send Buffer

    net.core.wmem_max = 25165824

    Increase the write-buffer-space allocatable

    net.ipv4.tcp_wmem = 20480 12582912 25165824
    net.ipv4.udp_wmem_min = 16384

    Increase the tcp-time-wait buckets pool size to prevent simple DOS attacks

    net.ipv4.tcp_max_tw_buckets = 1440000

    net.ipv4.tcp_tw_recycle = 1

    net.ipv4.tcp_tw_reuse = 1



  • What are you trying to achieve exactly? Are the default values not working for you?


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