cvs commit: src/etc services

[Greg 'groggy' Lehey]

On Saturday, 19 May 2007 at 21:43:35 -0700, Doug Barton wrote:
> Greg Lehey wrote:
>> grog        2007-05-20 03:31:52 UTC
>>
>>  FreeBSD src repository
>>
>>  Modified files:
>>    etc                  services
>>  Log:
>>  Bring the well known ports of /etc/services into sync with the IANA
>>  list.
>>
>>  This is only for the well known known ports (port 1-1023) for tcp and
>>  udp only.
>>
>>  Changes:
>>  - Removed "problems" comments around port 57, 77 and 87
>>  - Removed audionews (port 114)
>>  - Added imap3 (port 220)
>>  - Removed yak-chat (port 258)
>>  - Removed concert (port 786)
>>  - Added a lot of new allocations
>
> In the past we've avoided adding entries to /etc/services that were
> not actually being used by something we care about since every extra
> entry increases response time for getservby*() calls.

Understood.  It's a factor I thought about.

> Do we feel this is no longer a factor worth worrying about?

It's certainly worth worrying about, and I thought about it before
committing.  My thoughts:

- Clearly a lot of this stuff was just corrections.
- We don't know in advance which IP ports are used by ports from the
  Ports Collection.
- Maybe the performance issue isn't that serious after all.

To quote from services(5):

   BUGS
        A name server should be used instead of a static file.

I was just thinking that it might be relatively simple to build a
"compiled" file in tabular format and then mmap it.  That should be
relatively simple, and should greatly improve performance modulo mmap
overhead.  How does the mmap overhead compare with querying a name
server?

Greg
--
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