[squid-users] squid 4.1 default queue-size should consider concurrency

[Marcus Kool]

The original intention of this default value is have a queue that is twice the size of the messages being processed, so for helpers with concurrency=NCONC and num_children=NCHILD it makes a lot of 
sense to set the default queue length to 2*NCONC*NCHILD.
I do not understand that "compatibility" with doing the wrong calculation is a good thing.

Marcus


On 03/07/18 05:16, Amos Jeffries wrote:
> On 03/07/18 20:00, Amish wrote:
>> Hello,
>>
>> In squid 4.1 new option "queue-size" was introduced.
>>
>> In most (or all) cases default "queue-size" is set to children-max*2.
>>
>> But I believe it should be higher of (children-max*2) OR (concurrency*2)
>>
>> Or it can be some better formula but the point I am trying to make is
>> that, "concurrency" should be taken in to account for calculating
>> default value of "queue-size".
>>
>> Please consider.
> 
> FYI; When we add a directive or option to control some behaviour that
> already happens the default is usually set to the value all existing
> Squid are using so nobody gets an unexpected surprise with upgrade.
> 
> That can change later once more people have experimented to find what a
> better value actually is.
> 
> Cheers
> Amos
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