Hi,

On 15.12.2018 14:24, Matthias Fischer wrote:
> On 30.10.2018 17:05, Michael Tremer wrote:
>> On Tue, 2018-10-30 at 15:37 +0100, Matthias Fischer wrote:
>>> On 30.10.2018 15:03, Michael Tremer wrote:
>>> > Hey,
> 
> Hi,
> 
>> ...

>> A queue size of 64 seems sensible to me because that is probably what the>> average tabloid newspaper page has. Maybe it should be 16 * N or so...

>> ...

> I tested this quite a while now. If I set 'queue-size' to 64, there will
> be occasional warnings:
> 
> ...
> 2018/12/15 14:10:59 kid1| comm_udp_sendto FD 8, (family=2) 127.0.0.1:53:
> (1) Operation not permitted
> 2018/12/15 14:10:59 kid1| idnsSendQuery FD 8: sendto: (1) Operation not
> permitted
> ...
> 
> With a value of '128' these warnings do not occur.
> 
> Running on Duo Box.
> 
> Corresponding 'squid.conf' line, latest 'squid 4.4', 32bit:
> 
> ...
> url_rewrite_children 2 startup=2 idle=2 queue-size=128
> ...

FYI: Apparently two specific DNS block rules which blocked direct DNS
requests were responsible for these error messages.

After deactivating these rules, squid runs fine with "queue-size=64"

Best,
Matthias