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Date:      Sat, 15 Dec 2012 14:33:37 -0800
From:      Alfred Perlstein <bright@mu.org>
To:        Pawel Jakub Dawidek <pjd@FreeBSD.org>
Cc:        Adrian Chadd <adrian@FreeBSD.org>, "src-committers@FreeBSD.org" <src-committers@FreeBSD.org>, John Baldwin <jhb@FreeBSD.org>, "svn-src-all@FreeBSD.org" <svn-src-all@FreeBSD.org>, Alfred Perlstein <alfred@FreeBSD.org>, Andriy Gapon <avg@FreeBSD.org>, Navdeep Parhar <np@FreeBSD.org>, "svn-src-head@FreeBSD.org" <svn-src-head@FreeBSD.org>
Subject:   Re: svn commit: r244112 - head/sys/kern
Message-ID:  <03D95002-35FE-4880-80FA-3E97944AB988@mu.org>
In-Reply-To: <20121215210333.GH1411@garage.freebsd.pl>
References:  <201212110708.qBB78EWx025288@svn.freebsd.org> <201212121046.43706.jhb@freebsd.org> <CAJ-Vmo=U04GX%2BZyKuzXLwV%2BPpzU6_dm5BCmL=DWfsmhTVAR%2BsA@mail.gmail.com> <201212121658.49048.jhb@freebsd.org> <50C90567.8080406@FreeBSD.org> <50C909BD.9090709@mu.org> <50C91B32.4080904@FreeBSD.org> <50C91CD3.7030900@mu.org> <50C9206D.6080502@FreeBSD.org> <50C9271C.70803@mu.org> <20121215210333.GH1411@garage.freebsd.pl>

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Your use case (small swap & large ram) is exactly why I would like to try th=
is.=20

Do you object?

Sent from my iPhone

On Dec 15, 2012, at 1:03 PM, Pawel Jakub Dawidek <pjd@FreeBSD.org> wrote:

> On Wed, Dec 12, 2012 at 04:53:48PM -0800, Alfred Perlstein wrote:
>> Like what if I do gzipp'd kernel dumps next? (on my todo list)  How many=20=

>> people will complain that "gzip is too dangerous in kernel context foo=20=

>> foo!!!!"
>>=20
>> Not sure, I guess I'll find out?
>=20
> Well... :) savecore(8) has an option to compress the dumps. The only use
> case for compressing-while-dumping I see is small swap/dump partition.
> I'm not against this change, but I would not use it myself. When you are
> dumping your kernel is in undefined state, so the less code you execute
> in that state the higher chances your dump will succeed. I much prefer
> to either compress the dumps with savecore(8) or use ZFS dataset with
> compression enabled for /var/crash/.
>=20
> --=20
> Pawel Jakub Dawidek                       http://www.wheelsystems.com
> FreeBSD committer                         http://www.FreeBSD.org
> Am I Evil? Yes, I Am!                     http://tupytaj.pl



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