Dear All, I have been noticing for some time now that my squid server passes in nearly regular intervals during the day where the squid process CPU usage hits 100% for around 20 - 30 seconds or so during which squid will not serve requests. After these 20 -30sec the squid CPU usage drops to around 5 - 13% and website navigation is normal again. This happens like I said before at nearly regular intervals during each day several times and it happens only for around 20 -30sec. I have been observing the cache.log file but there is nothing apparent there. Is there a way that I know what squid is doing when this problem happens to try and resolve it as trying to solve it like it is now with no info about what is going on is somewhat vague. I think this problem happened after I have changed memory and disk replacement policies from lru to heap but I am not so sure that this is the source of the problem. I am using squid2.7-Stable6 on a fedora9 server which is a dual xeon quad 2.8Ghz CPU with 16Gb of Ram installed and 3 SAS hard drives. One more thing this server is also running videocache 1.9.1 but it has been running videocache also before the problem started with no problems whatsoever. I appreciate any help you can offer me. Sincerely, Ragheb Rustom Smartelecom S.A.R.L Sin el fil - Mar Elias Street Absi Center - Ground Floor Beirut, Lebanon Email: ragheb@xxxxxxxxxxxxxxx