Delay in dropbear login since 0.9.31

Will Moore will.moore at beraninstruments.com
Fri Sep 10 12:49:01 UTC 2010


> -----Original Message-----
> From: uclibc-bounces at uclibc.org [mailto:uclibc-bounces at uclibc.org] On
> Behalf Of Thomas Petazzoni
> Sent: 10 September 2010 09:36
> 
> Hello Will,
> 
> On Fri, 10 Sep 2010 09:30:24 +0100
> "Will Moore" <will.moore at beraninstruments.com> wrote:
> 
> > Since buildroot 2010.05 (uclibc 0.9.31) targeting i486 and building
> dropbear
> > (0.52) I have found a several second delay (perhaps as much as 10
> seconds)
> > in the ssh and scp login process.  I found that if I revert to uclibc
> > 0.9.30.3 then this login delay disappears.  I am happy to look further
> into
> > this to assist in finding the problem but am unsure where to start.
> Some
> > pointers would be much appreciated.
> 
> Peter as recently added an option to Buildroot that allows to disable
> the reverse DNS queries in Dropbear, see
> http://git.buildroot.net/buildroot/commit/?id=dd0d0f96d8e7a4b1feb2374c7898
> 92eec4386100.

Just to confirm that using the new buildroot option to turn off reverse DNS
queries in Dropbear does stop the delays I have been seeing when running
uClibc 0.9.31.

> 
> It might be the origin of your problem. Now, to the question of why
> uClibc 0.9.31 differs from 0.9.30.3 on this, I'll let the uClibc
> developers answer, because I don't know.
> 
> Regards,
> 
> Thomas
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com
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