On 16/03/2016 5:06 p.m., asakura@xxxxxxxxxxxxx wrote: > Hello, > > Recently, in our environment, CPU load on the squid proxy server > is happening trouble to become a 100%. > > example---- > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 29767 squid 20 0 1430m 1.3g 5332 R 99.1 17.4 6836:56 squid > 16856 squid 20 0 29764 3280 1620 S 2.0 0.0 68:46.34 squid_kerb_auth > 16860 squid 20 0 29760 3272 1616 S 1.7 0.0 43:53.67 squid_kerb_auth > 16855 squid 20 0 22636 1244 1000 S 0.3 0.0 2:57.66 negotiate_wrapp > 21437 asakura 20 0 15432 1632 932 R 0.3 0.0 0:01.02 top > 26167 root 20 0 19088 2248 1060 S 0.3 0.0 1016:14 syslog-ng > --- > > As a result of investigation, We suspect that CPU load become a 100% > when user attempts to log in from more than different ip addresses. > All that CPU has to be spent doing something. So what is that something? > This time, squid has been accessed from 20 or more units of > the PC with the same user ID. > When we disable user authentication from target segment, CPU load be low. > > We want to know whether CPU load goes up when squid is accessed from > a large number of different IP addresses with the same user ID. > > Our environment is below, > - squid-3.5.1 with squid_kerb_auth(sorry old version...) x5 server First step is upgrading. So you can see if it is one of the thousand or so bugs already fixed since that old version. There have been at least 2 bugs whose claimed symptom was "100% CPU usage" that got fixed this past year. Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
