I have problem with Apache and slow read request (see pic). This is not slowloris - we have mod_antiloris. On this server one from many domains have thousands request in minute (some mobile app check status). What can I set to better performance?
Many configs tried. This is current:
KeepAlive Off
StartServers 8
MinSpareServers 15
MaxSpareServers 20
ServerLimit 50
MaxClients 50
MaxRequestsPerChild 50
ListenBackLog 65536
ˇ sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_max_syn_backlog = 65536
net.ipv4.tcp_syncookies = 1
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
vm.swappiness = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_no_metrics_save = 1
EDIT 1:
This issue we have on all servers, but there are about 5 connections in READ. On this we have max connections in READ sometime. Thank you.
EDIT 2
#0 0x00007f92aad5f098 in __poll (fds=0x7ffffd321a10, nfds=1, timeout=<value optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:83
#1 0x00007f92ab259717 in apr_wait_for_io_or_timeout (f=<value optimized out>, s=<value optimized out>, for_read=1)
at support/unix/waitio.c:51
#2 0x00007f92ab25501a in apr_socket_recv (sock=0x7f92b4e372f8, buf=0x7f92b4e69568 "itoposvem.cz", len=0x7ffffd321af0)
at network_io/unix/sendrecv.c:87
#3 0x00007f92abc4b465 in socket_bucket_read (a=0x7f92b4e41be8, str=0x7ffffd321af8, len=0x7ffffd321af0, block=<value optimized out>)
at buckets/apr_buckets_socket.c:36
#4 0x00007f92abc4a417 in apr_brigade_split_line (bbOut=0x7f92b4e68bf0, bbIn=0x7f92b4e37e20, block=APR_BLOCK_READ, maxbytes=8192)
at buckets/apr_brigade.c:319
#5 0x00007f92ac7928a2 in ap_core_input_filter (f=0x7f92b4e37dc0, b=0x7f92b4e68bf0, mode=AP_MODE_GETLINE, block=APR_BLOCK_READ,
readbytes=0) at /usr/src/debug/httpd-2.2.15/server/core_filters.c:155
#6 0x00007f92a64d8d09 in logio_in_filter (f=<value optimized out>, bb=0x7f92b4e68bf0, mode=<value optimized out>,
block=<value optimized out>, readbytes=<value optimized out>) at /usr/src/debug/httpd-2.2.15/modules/loggers/mod_logio.c:125
#7 0x00007f92ac786e26 in ap_rgetline_core (s=0x7f92b4e675e8, n=8192, read=0x7ffffd321ce8, r=0x7f92b4e675b8, fold=0,
bb=0x7f92b4e68bf0) at /usr/src/debug/httpd-2.2.15/server/protocol.c:231
#8 0x00007f92ac78788e in read_request_line (conn=0x7f92b4e374e8) at /usr/src/debug/httpd-2.2.15/server/protocol.c:596
#9 ap_read_request (conn=0x7f92b4e374e8) at /usr/src/debug/httpd-2.2.15/server/protocol.c:913
#10 0x00007f92ac79fa30 in ap_process_http_connection (c=0x7f92b4e374e8) at /usr/src/debug/httpd-2.2.15/modules/http/http_core.c:183
#11 0x00007f92ac79b7d8 in ap_run_process_connection (c=0x7f92b4e374e8) at /usr/src/debug/httpd-2.2.15/server/connection.c:43
#12 0x00007f92ac7a7ad7 in child_main (child_num_arg=<value optimized out>)
at /usr/src/debug/httpd-2.2.15/server/mpm/prefork/prefork.c:667
#13 0x00007f92ac7a7dea in make_child (s=0x7f92adb59860, slot=8) at /usr/src/debug/httpd-2.2.15/server/mpm/prefork/prefork.c:763
#14 0x00007f92ac7a8a6c in perform_idle_server_maintenance (_pconf=<value optimized out>, plog=<value optimized out>,
s=<value optimized out>) at /usr/src/debug/httpd-2.2.15/server/mpm/prefork/prefork.c:898
#15 ap_mpm_run (_pconf=<value optimized out>, plog=<value optimized out>, s=<value optimized out>)
at /usr/src/debug/httpd-2.2.15/server/mpm/prefork/prefork.c:1102
#16 0x00007f92ac77f9b0 in main (argc=1, argv=0x7ffffd3221c8) at /usr/src/debug/httpd-2.2.15/server/main.c:763
