Re: strange logging line/statistics weirdness - plus 'timeout queue' weirdness?

On Thu, Sep 4, 2008 at 4:20 AM, Willy Tarreau <w#1wt.eu> wrote:
>
> I'm stupid, I found this morning why you see short timers in your logs.
> It's simply because your frontend is full. The connection between your
> client and haproxy does not really establish, your connection establishes
> between the client and the SYSTEM (your connection lies in the backlog
> queue). And the system will wake haproxy up once the frontend releases
> one connection slot by closing one connection. Haproxy starts the accept()
> timer at this precise moment (because it could not even know there was
> something pending, the system was keeping it), and if your request is
> fast to process, you have a small timer as above (eg: 17 ms after waiting
> 1 minute in the system).

ah, ok - the system!!! that certainly helps to clarify things. Thanks for that note - i missed that as well.

> As a hint, you might see in your logs that the
> connection which ended just before yours got processed took approximately
> the time you spent waiting.
>

right.. thanks!!!

-jf

--
In the meantime, here is your PSA:
"It's so hard to write a graphics driver that open-sourcing it would not help."
 -- Andrew Fear, Software Product Manager, NVIDIA Corporation
http://kerneltrap.org/node/7228