From: Egon Alter <egon.alter@gmx.net>
To: linux-arm-kernel@lists.infradead.org
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Marek <mmarek@suse.cz>,
hyojun.im@lge.com, raphael.andy.lee@gmail.com,
linux-kbuild@vger.kernel.org, gunho.lee@lge.com,
namhyung.kim@lge.com, x86@kernel.org,
linux-kernel@vger.kernel.org,
Josh Triplett <josh@joshtriplett.org>,
Nitin Gupta <nitingupta910@gmail.com>,
Richard Purdie <rpurdie@openedhand.com>,
Ingo Molnar <mingo@redhat.com>,
Joe Millenbach <jmillenbach@gmail.com>,
chan.jeong@lge.com, Kyungsik Lee <kyungsik.lee@lge.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Albin Tonnerre <albin.tonnerre@free-electrons.com>,
CE Linux Developers List <celinux-dev@lists.celinuxforum.org>,
minchan.kim@lge.com
Subject: Re: [RFC PATCH 0/4] Add support for LZ4-compressed kernels
Date: Tue, 29 Jan 2013 12:43:20 +0100 [thread overview]
Message-ID: <34874167.ghObrToI03@fb07-iapwap2> (raw)
In-Reply-To: <20130129101549.GP23505@n2100.arm.linux.org.uk>
Am Dienstag, 29. Januar 2013, 10:15:49 schrieb Russell King - ARM Linux:
> On Mon, Jan 28, 2013 at 02:25:10PM -0800, Andrew Morton wrote:
> > What's this "with enabled unaligned memory access" thing? You mean "if
> > the arch supports CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS"? If so,
> > that's only x86, which isn't really in the target market for this
> > patch, yes?
> >
> > It's a lot of code for a 50ms boot-time improvement. Does anyone have
> > any opinions on whether or not the benefits are worth the cost?
>
> Well... when I saw this my immediate reaction was "oh no, yet another
> decompressor for the kernel". We have five of these things already.
> Do we really need a sixth?
>
> My feeling is that we should have:
> - one decompressor which is the fastest
> - one decompressor for the highest compression ratio
> - one popular decompressor (eg conventional gzip)
the problem gets more complicated as the "fastest" decompressor usually
creates larger images which need more time to load from the storage, e.g. a
one MB larger image on a 10 MB/s storage (note: bootloaders often configure
the storage controllers in slow modes) gives 100 ms more boot time, thus
eating the gain of a "fast decompressor".
Egon
WARNING: multiple messages have this Message-ID (diff)
From: egon.alter@gmx.net (Egon Alter)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 0/4] Add support for LZ4-compressed kernels
Date: Tue, 29 Jan 2013 12:43:20 +0100 [thread overview]
Message-ID: <34874167.ghObrToI03@fb07-iapwap2> (raw)
In-Reply-To: <20130129101549.GP23505@n2100.arm.linux.org.uk>
Am Dienstag, 29. Januar 2013, 10:15:49 schrieb Russell King - ARM Linux:
> On Mon, Jan 28, 2013 at 02:25:10PM -0800, Andrew Morton wrote:
> > What's this "with enabled unaligned memory access" thing? You mean "if
> > the arch supports CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS"? If so,
> > that's only x86, which isn't really in the target market for this
> > patch, yes?
> >
> > It's a lot of code for a 50ms boot-time improvement. Does anyone have
> > any opinions on whether or not the benefits are worth the cost?
>
> Well... when I saw this my immediate reaction was "oh no, yet another
> decompressor for the kernel". We have five of these things already.
> Do we really need a sixth?
>
> My feeling is that we should have:
> - one decompressor which is the fastest
> - one decompressor for the highest compression ratio
> - one popular decompressor (eg conventional gzip)
the problem gets more complicated as the "fastest" decompressor usually
creates larger images which need more time to load from the storage, e.g. a
one MB larger image on a 10 MB/s storage (note: bootloaders often configure
the storage controllers in slow modes) gives 100 ms more boot time, thus
eating the gain of a "fast decompressor".
Egon
next prev parent reply other threads:[~2013-01-29 11:43 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-26 5:50 [RFC PATCH 0/4] Add support for LZ4-compressed kernels Kyungsik Lee
2013-01-26 5:50 ` Kyungsik Lee
2013-01-26 5:50 ` [RFC PATCH 1/4] decompressors: add lz4 decompressor module Kyungsik Lee
2013-01-26 5:50 ` Kyungsik Lee
2013-01-26 5:50 ` [RFC PATCH 2/4] lib: add support for LZ4-compressed kernels Kyungsik Lee
2013-01-26 5:50 ` Kyungsik Lee
2013-01-26 5:50 ` [RFC PATCH 3/4] arm: " Kyungsik Lee
2013-01-26 5:50 ` Kyungsik Lee
2013-01-26 5:50 ` [RFC PATCH 4/4] x86: " Kyungsik Lee
2013-01-26 5:50 ` Kyungsik Lee
2013-01-28 22:25 ` [RFC PATCH 0/4] Add " Andrew Morton
2013-01-28 22:25 ` Andrew Morton
2013-01-29 1:16 ` kyungsik.lee
2013-01-29 1:16 ` kyungsik.lee
2013-01-29 4:29 ` Nicolas Pitre
2013-01-29 4:29 ` Nicolas Pitre
2013-01-29 6:18 ` H. Peter Anvin
2013-01-29 6:18 ` H. Peter Anvin
2013-01-30 10:23 ` Johannes Stezenbach
2013-01-30 10:23 ` Johannes Stezenbach
2013-02-04 2:02 ` Markus F.X.J. Oberhumer
2013-02-04 2:02 ` Markus F.X.J. Oberhumer
2013-02-04 10:50 ` Russell King - ARM Linux
2013-02-04 10:50 ` Russell King - ARM Linux
2013-02-05 11:39 ` Johannes Stezenbach
2013-02-05 11:39 ` Johannes Stezenbach
2013-01-29 7:26 ` Richard Cochran
2013-01-29 7:26 ` Richard Cochran
2013-01-29 10:15 ` Russell King - ARM Linux
2013-01-29 10:15 ` Russell King - ARM Linux
2013-01-29 11:43 ` Egon Alter [this message]
2013-01-29 11:43 ` Egon Alter
2013-01-29 12:15 ` Russell King - ARM Linux
2013-01-29 12:15 ` Russell King - ARM Linux
2013-02-01 8:15 ` kyungsik.lee
2013-02-01 8:15 ` kyungsik.lee
2013-01-30 3:36 ` H. Peter Anvin
2013-01-30 3:36 ` H. Peter Anvin
2013-01-30 18:33 ` Nicolas Pitre
2013-01-30 18:33 ` Nicolas Pitre
2013-01-31 21:48 ` H. Peter Anvin
2013-01-31 21:48 ` H. Peter Anvin
2013-01-31 22:16 ` Nicolas Pitre
2013-01-31 22:16 ` Nicolas Pitre
2013-01-31 22:18 ` H. Peter Anvin
2013-01-31 22:18 ` H. Peter Anvin
2013-02-01 2:28 ` Nicolas Pitre
2013-02-01 2:28 ` Nicolas Pitre
2013-02-01 6:37 ` H. Peter Anvin
2013-02-01 6:37 ` H. Peter Anvin
2013-01-29 21:09 ` Rajesh Pawar
2013-01-29 21:09 ` Rajesh Pawar
2013-02-01 7:00 ` kyungsik.lee
2013-02-01 7:00 ` kyungsik.lee
2013-02-04 1:37 ` Markus F.X.J. Oberhumer
2013-02-04 1:37 ` Markus F.X.J. Oberhumer
2013-01-29 22:55 ` David Sterba
2013-01-29 22:55 ` David Sterba
2013-01-30 4:03 ` 이경식
2013-01-30 4:27 ` 이경식
2013-02-01 7:13 ` kyungsik.lee
2013-02-01 7:13 ` kyungsik.lee
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