Dummynet low bandwidth simulation
Ivan Voras
ivoras at fer.hr
Tue Apr 27 05:08:37 PDT 2004
Luigi Rizzo wrote:
> considering your msg about rst etc -- there are a number of potential
> failure modes including the most likely one below:
>
> + because of the extra delay, the initial syn handshake takes too
> long to complete causing way too many entries in the listen queue,
> so this saturates the server side.
I dont' understand this - the messages ("limiting RST response freq.") are
not showing on the server side (where the web server is), but on the client.
(Apache's default backlog is 511 and I raised kern.ipc.somaxconn to 1000 on
the server).
But I've discovered a possible cause: apache httpd processes have been
dyeing on the server, and occasionally I see: "collecting pv entries,
suggest increasing PMAP_SHPGPERPROC". What is that?
--
Every sufficiently advanced magic is indistinguishable from technology
- Arthur C Anticlarke
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