Squid at 100% CPU with 10 minutes period

[Guy Bashkansky <guybas@xxxxxxxxx>]

Hi,

The problem: on a certain origin content, Squid reaches 100% CPU
periodically, every 10 minutes, so the cache service suffers.

Any clues where to look?  Maybe this problem and its solution are known?

The CPU load pattern is something like this, minute-by-minute:
40%, 40%, 60%, 80%, 99%, 99%, 99%, 80%, 60%, 40%, repeat.

Thanks,
Guy