[squid-users] 3.3.x -> 3.4.x: huge performance regression

[Amos Jeffries]

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On 22/10/2014 7:02 p.m., Eugene M. Zheganin wrote:
> Hi.
> 
> I was using the 3.4.x branch for quite some time, it was working
> just fine on small installations. Yesterday I upgraded my largest
> cache installation from 3.3.13 to 3.4.8 (same config, diskd,
> NTLM/GSS-SPNEGO auth helpers, external helpers). Today morning I
> noticed that squid is spiking to 100% of CPU and almost isn't
> serving any traffic. Restart didn't help, squid is serving pages 
> while continuing to consume CPU, load grows, until it's at 100%,
> and after some time my users are unable to open any page from
> Internet. This is sad, so I downgraded to 3.3.13. CPU consumption
> went back to 20-35% and everything is back to normal.
> 
> In order to understand what's happening I did some dtrace profiling
> to see what is squid busy with, taking the consideration, that
> measuring the same amount of connect()/socket() syscalls should
> give same amount of squid work, but the results were totally
> different on one number of such syscalls.
> 
> Anyone to comment ?

Very well for stating what you looked at. But actually stating what
you saw when looking would have been more helpful.


I have seen a few people mentioning that diskd vs AUFS situation has
resolved itself in FreeBSD 9 or 10. You could try changing the
cache_dir "diskd" to "aufs" or "ufs" and see if the speed increases.
 NP: Only a -k reconfigure is needed moving between those three types.


Amos
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