On 08/04/2013 10:15, Ashly Pridmore wrote: > > Hello! > > We are using Apache as a front end for communication to a number of devices > using TR69 (SOAP over HTTP). In order to resolve a problem with a particular > device, I need to enable KeepAlive, but upon doing so I find that a number of > our other devices drop connection to the server until they are rebooted. The > reboot requirement is an acknowledge bug from the vendor, but I would like to > resolve the problem with the device communication as it suggests capacity > issues with our current configuration of Apache. > > At present, with KeepAlive disabled, the command > > netstat -plan|grep :80|wc -l > > returns a value between 5000 and 5500. This drops dramatically if keepalive is > enabled, to around 300 to 400. > > At present, Apache is configured as: > > Timeout 120 > KeepAlive Off > MaxKeepAliveRequests 100 > KeepAliveTimeout 5 > > <IfModule prefork.c> > StartServers 8 > MinSpareServers 5 > MaxSpareServers 20 > ServerLimit 1024 > MaxClients 1024 > MaxRequestsPerChild 0 #unlimited > </IfModule> > > <IfModule worker.c> > StartServers 2 > MaxClients 1000 > MinSpareThreads 25 > MaxSpareThreads 75 > ThreadsPerChild 25 > MaxRequestsPerChild 0 > </IfModule> > > The issue appears to be that when I enable KeepAlive with this configuration > Apache intermittently stops accepting connections on the socket. We found that > before changing the httpd.conf file (we raised the max clients and > maxrequestsperchild variables) and enabling KeepAlive meant that I was > intermittently unable to telnet into the server on port 80, suggesting a > capacity issue. > > I am wondering how high would be an acceptable limit for these values, and if > anyone had any other ideas for what might be causing this. > > Thanks in advance! > At least say if u run prefork of worker mpm.
KeepAlive is not recommended for a high traffic generally. In both configus you have too much delta between startserver/spareservers and maxclients. Apache spawn childs at fixed rate so it dont follow high connections peaks -- Simone Caruso IT Consultant +39 349 65 90 805
