Date: Sat, 14 Dec 2013 23:20:42 +0100 From: Marc UBM <ubm.freebsd@googlemail.com> To: freebsd-current@freebsd.org Subject: Re: SVN commit 259045 breaks -CURRENT Message-ID: <20131214232042.dbf77b9d6227c38292def34a@gmail.com> In-Reply-To: <20131214215904.GA24545@troutmask.apl.washington.edu> References: <52ACD12A.5020906@freebsd.org> <20131214215904.GA24545@troutmask.apl.washington.edu>
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On Sat, 14 Dec 2013 13:59:04 -0800 Steve Kargl <sgk@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
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