From: Jes Sorensen <Jes.Sorensen@redhat.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Marc MERLIN <marc@merlins.org>, linux-raid@vger.kernel.org
Subject: Re: md raid5 on top of dmcrypt, or dmcrypt on top of md raid5?
Date: Fri, 12 Feb 2016 09:34:59 -0500 [thread overview]
Message-ID: <wrfja8n62e0c.fsf@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1602121020570.11524@uplift.swm.pp.se> (Mikael Abrahamsson's message of "Fri, 12 Feb 2016 10:30:22 +0100 (CET)")
Mikael Abrahamsson <swmike@swm.pp.se> writes:
> On Thu, 11 Feb 2016, Marc MERLIN wrote:
>
>> But can someone confirm that indeed if I have a single md device,
>> and 4 CPUs, my throughput is not limited by a single CPU decrypting
>> the device?
>
> There have been multiple discussions about this over time, and since
> you didn't qualify "not good" with a number, it's hard to say if this
> is your problem or not.
About a year ago when I last received a new laptop, I put btrfs on top
of luks - it was a rather miserable experience. The system would freeze
up and be really slow.
I believe the issue was btrfs not acting well with crypto underneath it,
and there was hallway talk confirming this but I have no hard data. In
the end I gave up and put my /home on xfs on top of LUKS and used btrfs
for the uncrypted portions.
It may be the btrfs with crypto issues have been resolved since then.
Cheers,
Jes
next prev parent reply other threads:[~2016-02-12 14:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 16:29 md raid5 on top of dmcrypt, or dmcrypt on top of md raid5? Marc MERLIN
2016-02-11 17:13 ` Andreas Klauer
2016-02-11 17:40 ` Marc MERLIN
2016-02-12 9:30 ` Mikael Abrahamsson
2016-02-12 14:34 ` Jes Sorensen [this message]
2016-02-12 19:07 ` Marc MERLIN
2016-02-12 19:57 ` John Stoffel
2016-02-22 0:44 ` Marc MERLIN
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