semenphp

логи apache
[Tue Mar 15 21:21:58.008459 2016] [:error] [pid 1702] [client 178.62.228.32:40676] PHP Stack trace:, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.008472 2016] [:error] [pid 1702] [client 178.62.228.32:40676] PHP 1. {main}() /home/ros/web/rosru/public_html/gzip.php:0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014375 2016] [:error] [pid 1692] [client 178.62.228.32:40677] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014382 2016] [:error] [pid 2595] [client 178.62.228.32:40678] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014707 2016] [:error] [pid 2595] [client 178.62.228.32:40678] PHP Notice: Undefined index: HTTP_IF_NONE_MATCH in /home/ros/web/ros.ru/public_html/gzip.php on line 31, referer: rosru/sony-xperia-e3
[Tue Mar 15 21:21:58.014723 2016] [:error] [pid 2595] [client 178.62.228.32:40678] PHP Stack trace:, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014722 2016] [:error] [pid 1692] [client 178.62.228.32:40677] PHP Notice: Undefined index: HTTP_IF_NONE_MATCH in /home/ros/web/ros.ru/public_html/gzip.php on line 31, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014735 2016] [:error] [pid 2595] [client 178.62.228.32:40678] PHP 1. {main}() /home/ros/web/rosru/public_html/gzip.php:0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014739 2016] [:error] [pid 1692] [client 178.62.228.32:40677] PHP Stack trace:, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.014752 2016] [:error] [pid 1692] [client 178.62.228.32:40677] PHP 1. {main}() /home/ros/web/ros.ru/public_html/gzip.php:0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:58.467259 2016] [:error] [pid 2524] [client 178.62.228.32:40679] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/sony-xperia-e3
[Tue Mar 15 21:21:59.882598 2016] [:error] [pid 1626] [client 178.62.228.32:40680] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/admin/edit_product/37483
[Tue Mar 15 21:21:59.937447 2016] [:error] [pid 1702] [client 178.62.228.32:40681] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/resources/css/style.css?v=9
[Tue Mar 15 21:22:01.135051 2016] [:error] [pid 2595] [client 178.62.228.32:40682] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: rosru/admin/orders
[Tue Mar 15 21:22:01.216977 2016] [:error] [pid 1692] [client 178.62.228.32:40683] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/resources/css/style.css?v=9
[Tue Mar 15 21:22:03.129943 2016] [:error] [pid 2524] [client 178.62.228.32:40684] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: ros.ru/tovary/zashitnoe-steklo-ultra-tempered-glas...
[Tue Mar 15 21:22:04.200340 2016] [:error] [pid 1626] [client 178.62.228.32:40685] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0
[Tue Mar 15 21:22:05.324678 2016] [:error] [pid 2599] [client 178.62.228.32:40686] PHP Warning: Unknown: output handler 'ob_gzhandler' conflicts with 'zlib output compression' in Unknown on line 0, referer: /sony-xperia-e3/

команда top
1953 mysql 20 0 4393492 682772 7584 S 38.2 8.4 2:55.18 mysqld
4380 www-data 20 0 459604 22584 8328 S 3.7 0.3 0:00.30 apache2
2615 www-data 20 0 460960 27704 14064 S 3.0 0.3 0:04.47 apache2
4369 www-data 20 0 459116 26016 12208 S 2.7 0.3 0:01.64 apache2
1305 nginx 20 0 52984 3008 1028 S 0.7 0.0 0:04.18 nginx
4370 roscase 20 0 460284 28980 14016 S 0.7 0.4 0:00.96 apache2
7 root 20 0 0 0 0 S 0.3 0.0 0:01.42 rcu_sched
9 root 20 0 0 0 0 S 0.3 0.0 0:00.23 rcuos/1
1303 nginx 20 0 53108 3008 1028 S 0.3 0.0 0:03.88 nginx
2218 www-data 20 0 462188 31664 16872 S 0.3 0.4 0:05.05 apache2
4093 www-data 20 0 459700 24912 12584 S 0.3 0.3 0:01.10 apache2
4371 www-data 20 0 457552 21592 9396 S 0.3 0.3 0:01.21 apache2
4387 root 20 0 24920 1640 1176 R 0.3 0.0 0:00.05 top
1 root 20 0 33464 2820 1472 S 0.0 0.0 0:01.33 init

конфигурации apache
# It is split into several files forming the configuration hierarchy outlined
# below, all located in the /etc/apache2/ directory:
#
# /etc/apache2/
# |-- apache2.conf
# | `-- ports.conf
# |-- mods-enabled
# | |-- *.load
# | `-- *.conf
# |-- conf.d
# | `-- *

# Global configuration
PidFile ${APACHE_PID_FILE}
Timeout 30
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 10

StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 256
MaxClients 200
MaxRequestsPerChild 4000

StartServers 2
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 64
ThreadsPerChild 25
MaxClients 200
MaxRequestsPerChild 4000

StartServers 2
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 64
ThreadsPerChild 25
MaxClients 200
MaxRequestsPerChild 4000

ExtendedStatus On

SetHandler server-status
Order deny,allow
Deny from all
Allow from all

# These need to be set in /etc/apache2/envvars
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
#User www-data
#Group www-data

AccessFileName .htaccess

Order allow,deny
Deny from all
Satisfy all

DefaultType None
HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn

# Include module configuration:
Include mods-enabled/*.load
Include mods-enabled/*.conf

# Include list of ports to listen on and which to use for name based vhosts
Include ports.conf

LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
LogFormat "%b" bytes

Include conf.d/

# Include the virtual host configurations:
#Include sites-enabled/
#Alias /phpmyadmin /usr/share/phpmyadmin

конфиги mysql
[client]
port=3306
socket=/var/run/mysqld/mysqld.sock

[mysqld_safe]
socket=/var/run/mysqld/mysqld.sock
open-files-limit=32000
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

[mysqld]
user=mysql
pid-file=/var/run/mysqld/mysqld.pid
socket=/var/run/mysqld/mysqld.sock
port=3306
basedir=/usr
datadir=/var/lib/mysql
tmpdir=/tmp
lc-messages-dir=/usr/share/mysql
log_error=/var/log/mysql/error.log
max_allowed_packet=50M
max_connections=1000
max_user_connections=50
wait_timeout=100
interactive_timeout=10
long_query_time=5
skip-name-resolve
#
default-storage-engine = innodb

query_cache_size=30M
tmp_table_size=150M
max_heap_table_size=150M

memlock
table_cache=4096
thread_cache_size=300
thread_concurrency=2
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 3

# InnoDb
innodb_file_per_table

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/lib/mysql
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/lib/mysql
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
innodb_log_group_home_dir = /var/lib/mysql/
innodb_buffer_pool_size = 1G
innodb_additional_mem_pool_size = 20M
innodb_lock_wait_timeout = 120

innodb_thread_concurrency = 2
innodb_flush_log_at_trx_commit = 2
innodb_flush_method = O_DIRECT

# MyIsam
key_buffer_size = 1G
myisam_recover
myisam_repair_threads = 1
myisam_data_pointer_size = 6

!includedir /etc/mysql/conf.d/

этот сайт работал на сервере больше двух лет, и буквально вдруг снес чего стал тормозит.
помогите разобраться?