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Date:      Tue, 12 Oct 2010 10:18:18 -0700
From:      Jeremy Chadwick <freebsd@jdc.parodius.com>
To:        Andriy Gapon <avg@icyb.net.ua>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: Locked up processes after upgrade to ZFS v15
Message-ID:  <20101012171818.GA37195@icarus.home.lan>
In-Reply-To: <4CB48BFA.50604@icyb.net.ua>
References:  <20101012130245.GA32584@icarus.home.lan> <4CB46CE9.20905@icyb.net.ua> <20101012143559.GA34396@icarus.home.lan> <4CB47355.1050109@icyb.net.ua> <20101012151852.GA35014@icarus.home.lan> <4CB47E3F.3050002@icyb.net.ua> <20101012154543.GA35378@icarus.home.lan> <4CB4887C.3050309@icyb.net.ua> <20101012162045.GA36262@icarus.home.lan> <4CB48BFA.50604@icyb.net.ua>

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On Tue, Oct 12, 2010 at 07:25:30PM +0300, Andriy Gapon wrote:
> on 12/10/2010 19:20 Jeremy Chadwick said the following:
> > On Tue, Oct 12, 2010 at 07:10:36PM +0300, Andriy Gapon wrote:
> >>> Secondly: the testbox is running kernel/world source from October 8th.
> >>> I *have not* applied your kernel patch at this point.  Just a FYI.
> >>
> >> OK, can you now retest with the patch?
> > 
> > Will do!  Should have results in the next hour or so (going to start the
> > buildkernel now).
> 
> Just in case: KERNFAST=1 makes things really fast :-)

Hmm, first time I've heard of that one.  Akin to something like NOCLEAN?
Ah, I'll just look it/the code up myself.  :-)

Anyway, system's rebuilt with your patch.  Seems to work!  The sendfile
regression test now returns to the shell after the mmap test, and the
DTrace script doesn't output any information, which I imagine is what's
supposed to happen given the criteria.

I'd say commit it!  :-)

Also, one thing which I'm sure users or SAs will ask in the meantime:
what's the workaround, at least for Apache 2.x?  Disable sendfile,
disable mmap, or both together?

-- 
| Jeremy Chadwick                                   jdc@parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |




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