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From Greg Ames <>
Subject Re: [Fwd: [PATCH scoreboard] adding port entry]
Date Wed, 27 Mar 2002 20:44:46 GMT
Stas Bekman wrote:

> So there are two different issues here:
> 1. patching the scoreboard to collect and store this extra info
> 2. patching mod_status to use this extra info

> since mod_status in the extended mode is already doing a lot of work,
> how much of an extra overhead will the port/ip info will add?

A hard question to answer without benchmarking.  Where does the scoreboard
growth stop?

I assume we would support IPv6, so this would mean increasing the size of
worker_score by the size of a v6 sockaddr struct, which is 24-28 bytes.  The
worker_score is 208 bytes now on my Linux box.  It's a Pentium II with a 32 byte
cache line size.  This means that each request would touch a minimum of 8 cache
lines rather than 7 cache lines for the worker_score, i.e., it would cause at
least one additional cache miss per request on my box.


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