Re: SVN commit 259045 breaks -CURRENT

On Sat, 14 Dec 2013 13:59:04 -0800
Steve Kargl <sgk_at_troutmask.apl.washington.edu> wrote:

> On Sat, Dec 14, 2013 at 10:44:10PM +0100, Stefan Esser wrote:
> > I noticed a severe slowdown and network problems on my amd64 -CURRENT
> > system. By bisecting SVN revisions I identified the following commit
> > to be responsible:
> > 
> > ----------------------------------------------------------------------
> > r259045 | kib | 2013-12-06 22:44:13 +0100 (Fri, 06 Dec 2013) | 9 lines
> > 
> > Disallow optimizations which potentially remove boundary checks
> > for signed values due to a compiler authors considering integer
> > overflow as impossible.
> > 
> > The change follows suit of other projects taking the same measure.
> > ----------------------------------------------------------------------
> > 
> > This commit added the following line to /sys/conf/kern.mk:
> > 
> > CFLAGS+=       -fno-strict-overflow
> > 
> > 
> > The most obvious symptoms of the problem on my system are:
> > 
> > 1) sa-spamd needs > 140 seconds to start
> >    (instead of a few seconds)
> > 
> > 2) SSH logins are very slow, many seconds of delay between connect
> >    and password prompt, several seconds after password entry until
> >    a command prompt appears (normally instantaneous)
> > 
> 
> Ah, so that explains the behavior I'm see.  Just updated a circa Aug 3rd
> i386 FreeBSD to top-of-tree.  My ssh logins to my work system take 30+
> seconds now. :(

I observe dnsmasq causing extremely high network latency without any
visible reason - though that may not be related. I'll remove
-fno-strict-overflow, recompile kernel and see if anything changes.

Bye
Marc