[squid-users] Tune Squid proxy to handle 90k connection

[Alex Rousskov]

On 2024-05-17 09:51, Andre Bolinhas wrote:

> Alex can you reply this please

Already did. Please see
https://lists.squid-cache.org/pipermail/squid-users/2024-May/026677.html

Alex.


>>  Hi
>> Well, the performance and NTLM issues that I had with persistent 
>> connections goes back to squid 3.5 😳, so I never re-enabled it again 
>> on new version, I'm using Squid 5.9 and 6.8 now.
>>
>> If you tell me that now that persistent connections are more stable 
>> and inclusive is recommended to be enabled by default to gain 
>> performance and also speed up NTLM/Kerberos authentication, I will 
>> re-enable again on my production servers. 
> 
> 
> On 17/05/2024 14:42, Alex Rousskov wrote:
>> On 2024-05-16 19:12, Jonathan Lee wrote:
>>> What about using COSS file system?
>>
>> Squid does not support COSS cache_dirs since v3.5. If Squid in 
>> question does disk caching, then rock cache_dirs may be the best bet.
>>
>> Alex.
>>
>>
>>>> On May 16, 2024, at 15:10, Andre Bolinhas wrote:
>>>>
>>>>  Hi
>>>> Well, the performance and NTLM issues that I had with persistent 
>>>> connections goes back to squid 3.5 😳, so I never re-enabled it 
>>>> again on new version, I'm using Squid 5.9 and 6.8 now.
>>>>
>>>> If you tell me that now that persistent connections are more stable 
>>>> and inclusive is recommended to be enabled by default to gain 
>>>> performance and also speed up NTLM/Kerberos authentication, I will 
>>>> re-enable again on my production servers.
>>>>
>>>> Best Regards
>>>>
>>>> On 16/05/2024 21:34, Alex Rousskov wrote:
>>>>> On 17/05/24 02:23, Bolinhas André wrote:
>>>>>
>>>>>> Has I explain, by default I set those directives to off to avoid 
>>>>>> high cpu consumption.
>>>>>
>>>>> Just FYI: In this context, when you say "default", folks will tend 
>>>>> to think that you are talking about default Squid configuration 
>>>>> setting (i.e. something hard-coded in Squid code) rather than the 
>>>>> actual thing you are talking about (i.e. your custom Squid 
>>>>> configuration).
>>>>>
>>>>> I do not know whether disabling persistent connections reduces CPU 
>>>>> consumption in your environment. There are too many variables. In 
>>>>> most cases, including NTLM authentication cases detailed by Amos, 
>>>>> disabling persistent connections hurts performance, but there are 
>>>>> always exceptions (and bugs).
>>>>>
>>>>> It is not clear (to me) whether you disable persistent connections 
>>>>> because they hurt performance in your environment OR you disable 
>>>>> persistent connections because _you assume_ (without evidence) that 
>>>>> they hurt performance in your environment.
>>>>>
>>>>> If you do not know that disabling persistent connections reduces 
>>>>> CPU consumption in your environment, then you should not disable 
>>>>> them until you discover strong evidence that they hurt performance. 
>>>>> At that point, you can share that evidence and ask for 
>>>>> configuration advice based on that evidence.
>>>>>
>>>>>
>>>>> HTH,
>>>>>
>>>>> Alex.
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