[bind10-dev] Enabling/disabling logging on per-message basis

[Michal 'vorner' Vaner]

Hello

On Fri, Mar 30, 2012 at 10:23:02AM -0700, JINMEI Tatuya / 神明達哉 wrote:
> > As measured by me, the orders of logging messages is above 50M MPS
> > (again error to the safe side). That means our .5M messages output
> > for that form 1% of the time of the answering process. Even by
> > making the process of determining the message should not be logged
> > twice as slow would be 1% difference in the total performance.
> 
> I'm afraid I don't understand the measurement description.  But if you
> mean you compared the two versions of BIND 10:
> A: the current (= something like the latest release) version
> B: the current version with the proposed change in this thread,
> and B is only 1% slower than A in terms of max qps it can handle
> (measured by queryperf or something), then I agree the performance
> wouldn't be an issue.

I did not measure the whole server, because the change creates a small change in
the API interface and makes the code not compile in various area I didn't care
to fix. But from the measurements I did I can conclude the expected slowdown
would be well below 1%. I know measuring with queryperf would be better, but I
believe I added enough reserves into the estimates for them to be true even when
in semi-theoretical level.

With regards

-- 
Fragile. Do not turn umop ap1sdn!

Michal 'vorner' Vaner
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