[squid-users] Why Squid on CentOS is faster than Debian ?

[Amos Jeffries]

On 31/03/19 3:41 am, David Touzeau wrote:
> On 30.03.19 10:22, David Touzeau wrote:
> 
>>> Did you have perform squid stress on Debian against CentOS ?
>>>
>>> I have installed:
>>>
>>> * Debian 9 net install + Squid compiled
>>> * CentOS 7 minimal  + Squid compiled
>>>
>>> Same version, same compilation parameters, same Squid settings.
>>
>>> It seems that Squid on CentOS is 10 times faster than squid on Debian
>>
>> faster in what? Response time? number of parallel connections?
>> single or multiple connection data transfers?
>> HTTP or HTTPS?
>>
>>> What are kernel differences that made this huge performance changes?
>>
>> no kernel differences should cause 10x speed difference.
>>

If you still have the config.log files from the build you may be able to
track down something being detected (or not) in one of the builds.

The -march=native or -O level options for compile would be the first
place I look for a major difference like that. Either on Squid or on one
of the system libraries it uses. The *FLAGS summary at the end of the
build can be a good starting point for comparison.

Compiler version can also have an effect as newer compilers use more
performance related tricks than older ones (YMMV on which tricks are
actually better).


>>
> Faster in what? Response time?
> 
> 1. response time, MISS and HIT are faster
> 
> Example:
> 
> on Centos MEM_HIT are about  0-1 msec against Debian about 3-4 msec
> 

On the same test traffic?


Amos