From: David Disseldorp <ddiss@suse.de>
To: Ceriel Jacobs <linux-ide@crashplan.pro>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Project idea: reduce boot time/RAM usage: option to disable/delay raid6_pq and xor kmod
Date: Thu, 28 Dec 2017 21:18:07 +0100 [thread overview]
Message-ID: <20171228211807.60f115f4@suse.de> (raw)
In-Reply-To: <6f082a1d-ed15-2583-fabf-9aa7c80baef0@crashplan.pro>
On Sun, 24 Dec 2017 13:31:40 +0100, Ceriel Jacobs wrote:
> Saving:
> 1. ± 0.4 seconds of boot time (10% of boot until root)
> 2. ± 150k of RAM
> 3. ± 75k of disk space
Thanks for bringing this up - I'm also particularly frustrated by the
boot delay caused by the raid6 algorithm benchmark (1).
> New kernel command-line parameters?
> a.) disable, like:
> - btrfs=noraid6_pq
> - btrfs=noraid (=no xor at all)
> b.) delay raid6_pq and xor module loading, for cases where root mount
> doesn't need raid6_pq and/or xor.
c) It might not help with (2) or (3), but I'd be happy with an option to
preselect the raid6 algorithm, so that the benchmark didn't run on each
boot.
Cheers, David
next prev parent reply other threads:[~2017-12-28 20:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-24 12:31 Project idea: reduce boot time/RAM usage: option to disable/delay raid6_pq and xor kmod Ceriel Jacobs
2017-12-28 20:18 ` David Disseldorp [this message]
2018-01-02 17:55 ` David Sterba
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