Re: Desired improvements in Nmap performance?

[Brandon Enright <bmenrigh () ucsd edu>]

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On Sun, 30 Nov 2008 18:24:59 -0700
David Fifield <david () bamsoftware com> wrote:

> I'm starting a project to improve Nmap's performance and the
> predictability of the length of its scans. This may involve tuning
> performance parameters, adjusting the congestion control mechanism, or
> other things not thought of yet.
>
> What complaints do you have about Nmap's performance? One thing I have
> heard is that for very large scans Nmap may be too slow, or the time
> taken may be too unpredictable.
>
> One possible improvement is I've identified is that sometimes scan
> delay kicks in when I don't think it should. If a scan has just
> started and I see the scan delay go from 0 to 5 ms I'm likely to kill
> the scan and start it over.
>
> Write back with possibilities you see for improvement. I'd like any
> changes we make to be in response to actual user concerns.
>
> David Fifield

Hi David,

I'm glad you'll be looking into performance changes.  I've run into
many performance oddities that I've had to ignore or try to work
around.  Unfortunately reproducing these in a controlled way so that
you have something to test and work off of is hard so rather than send
you one long email, I'll probably respond to this one several times as
I can come up with decent examples of things that should be looked at.

Brandon

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