Re: [squid-users] 100% CPU

From: Amos Jeffries <>
Date: Sat, 11 Aug 2012 13:01:08 +1200

On 11/08/2012 3:05 a.m., Hank Disuko wrote:
> Hi folks,
> I'm using:
> Squid Cache version 3.0.STABLE13 for i686-suse-linux
> This cache has been running well for at least a couple years, or more. As of yesterday, my squid process started using 100% CPU and users on the proxy are experiencing extremely slow Internet speeds.
> I've disabled caching (thinking it was maybe a cache issue), but the problem remains.

Okay. Sometimes it is garbage collection on large caches which sucks up
CPU. This test eliminates that.

> I've tried strace on the squid process, but I don't know what I'm even looking for. As for syscalls, I see lots of reads and writes.
> It seems to be a particular user, or number of users running something through the proxy that is causing the CPU to spike. This morning everything was find for a couple hours with users on it...CPU was behaving...then within a minute or so it spiked and remained pegged at 100%. Would a video or audio stream cause something like this? A very large download?

Or lots of downloads. Or someone hit one of the DoS vulnerabilities
which have been found and fixed since that release came out.

*please* upgrade your Squid. 3.0 is several years past its end-of-life.
At minimum please upgrade to 3.0.STABLE26 to avoid the worst DoS

NOTE: free support is only available for the current Squid releases.

Received on Sat Aug 11 2012 - 01:01:24 MDT

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