Skip to main content

response time - Linux/Apache performance very slow even on local network

I have an Ubuntu server machine running Apache and MYSQL. System and version info is as follows:
Linux kernel 3.0.0.-12
Apache/2.2.20
MySQL Ver 14.14.Distrib 5.1.58



I am running a few websites on this server, some HTML only, some PHP/MySQL. THe [problem is that response time is very slow, both on static as well as the dynamic sites. Sometimes it takes more than 10 seconds before a response is given, this makes the sites very slow and almost unusable.
The problem occurs even when requesting from the local network. I have added the involved subdomains to my /etc/hosts file, and abolve all the problem is not solved by using IP numbers instead of URL's. So there is no DNS lookup issue.
I have modified the log format by showing the response times and sometimes a files takes 12 seconds to be served, see the jquery~.js file in the example screenshot.
I have no explanation for this extremely long response time, but is is not even the only issue here, some other files takes a long time to be served too, but do not show a long response time in the log file.
So probably different tissues are involved here. I cannot find a solution until now, any suggestions???
THanx in advance, Klaas



link to screenshot picture from access logfile




Some extra configuration info:



apache2.conf (comment is removed)



LockFile ${APACHE_LOCK_DIR}/accept.lock
PidFile ${APACHE_PID_FILE}
Timeout 300
KeepAlive On
MaxKeepAliveRequests 100

KeepAliveTimeout 5

    StartServers          5
    MinSpareServers       5
    MaxSpareServers      10
    MaxClients          150
    MaxRequestsPerChild   0




    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          150
    MaxRequestsPerChild   0




    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          150
    MaxRequestsPerChild   0


User ${APACHE_RUN_USER}

Group ${APACHE_RUN_GROUP}

AccessFileName .htaccess


    Order allow,deny
    Deny from all
    Satisfy all



DefaultType text/plain
HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn

Include mods-enabled/*.load
Include mods-enabled/*.conf
Include httpd.conf
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\" %T/%D" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
Include conf.d/
Include sites-enabled/


And the virtual hostfile for one of the slow sites, in fact it is pretty straightforward...





    ServerAdmin blablabla@gmail.com
        ServerSignature EMail
        ServerName toenjoy.drsklaus.nl
    DocumentRoot /var/www/toenjoy.drsklaus.nl
    
        Options FollowSymLinks
        AllowOverride None
    

    
        Options Indexes FollowSymLinks MultiViews
        AllowOverride AuthConfig
                AuthType Basic
                AuthName "To Enjoy"
                AuthUserFile /etc/.htpasswd
                Require user petraaa
        Order allow,deny
        allow from all
    


    ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
    
        AllowOverride None
        Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
        Order allow,deny
        Allow from all
    

    ErrorLog /var/log/apache2/error.log


    # Possible values include: debug, info, notice, warn, error, crit,
    # alert, emerg.
    LogLevel warn
    CustomLog /var/log/apache2/access.log combined

    Alias /doc/ "/usr/share/doc/"
    
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None

        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128



And the output of free -m:



klaas@ubuntu-server:/etc/apache2$ free -m

             total       used       free     shared    buffers     cached
Mem:          1997       1401        595          0        144       1017
-/+ buffers/cache:        238       1758
Swap:         2035          0       2035


and I have no indication that swapping occurs on the moments the site is slow.
I have runned top and it does not appear to be a CPU issue. I have the impression that the spawning of a apache thread could maybe be the bottleneck but it is just a suggestion.
Maybe this gives some extra information!




EDIT:
The problem seemed to be gone for some time but occurs again! And not only with Apache, also connecting using SSH takes a tremendous time, sometimes it takes up to 15 seconds before the keyphrase is asked for. Also scp works very slowly. The behavious is really unpredoctable and makes the server very hard to use.
Any ideas...?

Comments

Post a Comment

Popular posts from this blog

linux - iDRAC6 Virtual Media native library cannot be loaded

When attempting to mount Virtual Media on a iDRAC6 IP KVM session I get the following error: I'm using Ubuntu 9.04 and: $ javaws -version Java(TM) Web Start 1.6.0_16 $ uname -a Linux aud22419-linux 2.6.28-15-generic #51-Ubuntu SMP Mon Aug 31 13:39:06 UTC 2009 x86_64 GNU/Linux $ firefox -version Mozilla Firefox 3.0.14, Copyright (c) 1998 - 2009 mozilla.org On Windows + IE it (unsurprisingly) works. I've just gotten off the phone with the Dell tech support and I was told it is known to work on Linux + Firefox, albeit Ubuntu is not supported (by Dell, that is). Has anyone out there managed to mount virtual media in the same scenario?
Post a Comment
Read more

hp proliant - Smart Array P822 with HBA Mode?

We get an HP DL360 G8 with an Smart Array P822 controller. On that controller will come a HP StorageWorks D2700 . Does anybody know, that it is possible to run the Smart Array P822 in HBA mode? I found only information about the P410i, who can run HBA. If this is not supported, what you think about the LSI 9207-8e controller? Will this fit good in that setup? The Hardware we get is used but all original from HP. The StorageWorks has 25 x 900 GB SAS 10K disks. Because the disks are not new I would like to use only 22 for raid6, and the rest for spare (I need to see if the disk count is optimal or not for zfs). It would be nice if I'm not stick to SAS in future. As OS I would like to install debian stretch with zfs 0.71 as file system and software raid. I have see that hp has an page for debian to. I would like to use hba mode because it is recommend, that zfs know at most as possible about the disk, and I'm independent from the raid controller. For us zfs have many benefits,
Post a Comment
Read more

apache 2.2 - Server Potentially Compromised -- c99madshell

So, low and behold, a legacy site we've been hosting for a client had a version of FCKEditor that allowed someone to upload the dreaded c99madshell exploit onto our web host. I'm not a big security buff -- frankly I'm just a dev currently responsible for S/A duties due to a loss of personnel. Accordingly, I'd love any help you server-faulters could provide in assessing the damage from the exploit. To give you a bit of information: The file was uploaded into a directory within the webroot, "/_img/fck_uploads/File/". The Apache user and group are restricted such that they can't log in and don't have permissions outside of the directory from which we serve sites. All the files had 770 permissions (user rwx, group rwx, other none) -- something I wanted to fix but was told to hold off on as it wasn't "high priority" (hopefully this changes that). So it seems the hackers could've easily executed the script. Now I wasn't able
Post a Comment
Read more