From: "H. Peter Anvin" <hpa@zytor.com>
To: kevin.granade@gmail.com
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>,
linux@arm.linux.org.uk, alain@knaff.lu,
linux-kernel@vger.kernel.org, linux-embedded@vger.kernel.org
Subject: Re: [PATCH 3/5] Add support for LZO-compressed kernels
Date: Wed, 22 Jul 2009 09:08:31 -0700 [thread overview]
Message-ID: <4A67397F.8080705@zytor.com> (raw)
In-Reply-To: <0022152d7fe9b6dbcf046f4d04a6@google.com>
kevin.granade@gmail.com wrote:
> >
> > So for a compression ratio that is still relatively close to gzip, it's
> > much faster to extract, at least in that case.
>
> Is that "time to run the extraction algorithm", or "time to read in
> image from media and extract"? I think the time to read from the media
> would tend to dominate the decompression time.
> Either way, could you provide the other time for each algorithm in order
> to give a sense of how this might scale to other CPU speeds/media read
> speeds?
>
If you have very slow media, you probably want to use LZMA. If you have
a very slow CPU and comparatively fast media, LZO might be a good
option... I have heard people asking for *uncompressed* kernels for this
reason, but LZO runs at a significant fraction of memcpy() speed.
-hpa
next prev parent reply other threads:[~2009-07-22 16:08 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-22 14:01 [PATCH 1/5] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Albin Tonnerre
2009-07-22 14:01 ` [PATCH 2/5] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Albin Tonnerre
2009-07-22 14:01 ` [PATCH 3/5] Add support for LZO-compressed kernels Albin Tonnerre
2009-07-22 14:01 ` [PATCH 4/5] Add support for LZO-compressed kernels for ARM Albin Tonnerre
2009-07-22 14:01 ` [PATCH 5/5] Add support for LZO-compressed kernels on x86 Albin Tonnerre
2009-07-29 15:37 ` [PATCH] Add LZO compression support for initramfs and old-style initrd Albin Tonnerre
2009-07-29 20:00 ` [PATCH 5/5] Add support for LZO-compressed kernels on x86 H. Peter Anvin
2009-07-29 21:02 ` Sam Ravnborg
2009-07-31 7:51 ` Albin Tonnerre
2009-07-31 9:31 ` Sam Ravnborg
2009-08-03 14:58 ` [PATCH 1/6] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Albin Tonnerre
2009-08-03 14:58 ` [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Albin Tonnerre
2009-08-03 14:58 ` [PATCH 3/6] Add support for LZO-compressed kernels Albin Tonnerre
2009-08-03 14:58 ` [PATCH 4/6] Add support for LZO-compressed kernels for ARM Albin Tonnerre
2009-08-03 14:58 ` [PATCH 5/6] Add support for LZO-compressed kernels on x86 Albin Tonnerre
2009-08-03 14:58 ` [PATCH 6/6] Add LZO compression support for initramfs and old-style initrd Albin Tonnerre
2009-08-03 15:12 ` H. Peter Anvin
2009-08-03 16:05 ` Albin Tonnerre
2009-08-03 15:11 ` [PATCH 5/6] Add support for LZO-compressed kernels on x86 H. Peter Anvin
2009-08-06 22:40 ` [PATCH 4/6] Add support for LZO-compressed kernels for ARM Russell King - ARM Linux
2009-08-07 9:24 ` Albin Tonnerre
2009-08-07 9:34 ` Russell King - ARM Linux
2009-08-07 9:36 ` Alain Knaff
2009-08-07 10:21 ` Albin Tonnerre
2009-08-07 11:29 ` Alain Knaff
2009-08-07 11:50 ` Matthieu CASTET
2009-08-07 13:01 ` Albin Tonnerre
2009-08-07 13:27 ` Matthieu CASTET
2009-08-07 13:55 ` Albin Tonnerre
2009-08-07 20:00 ` Russell King - ARM Linux
2009-08-07 20:21 ` H. Peter Anvin
2009-08-07 21:08 ` Sam Ravnborg
2009-08-11 9:44 ` Albin Tonnerre
2009-08-11 13:39 ` Sam Ravnborg
2009-08-11 14:17 ` Albin Tonnerre
2009-08-11 13:51 ` Matthieu CASTET
2009-08-11 16:03 ` H. Peter Anvin
2009-08-11 16:27 ` Albin Tonnerre
2009-08-11 16:31 ` H. Peter Anvin
2009-08-13 9:30 ` Albin Tonnerre
2009-08-13 14:07 ` H. Peter Anvin
2009-08-13 12:25 ` Albin Tonnerre
2009-08-14 10:08 ` [PATCH 4/6 v2] " Albin Tonnerre
2009-09-04 15:31 ` Albin Tonnerre
2009-08-04 23:00 ` [PATCH 3/6] Add support for LZO-compressed kernels Andrew Morton
2009-08-04 23:00 ` Andrew Morton
2009-08-05 1:36 ` H. Peter Anvin
2009-08-05 9:19 ` Albin Tonnerre
2009-08-04 23:04 ` Andrew Morton
2009-08-04 23:04 ` Andrew Morton
2009-08-04 22:55 ` [PATCH 2/6] include/linux/unaligned/{l,b}e_byteshift.h: Fix usage for compressed kernels Andrew Morton
2009-08-04 22:55 ` Andrew Morton
2009-08-05 9:29 ` Albin Tonnerre
2009-08-05 21:19 ` Russell King - ARM Linux
2009-08-04 22:55 ` [PATCH 1/6] lib/decompress_*: only include <linux/slab.h> if STATIC is not defined Andrew Morton
2009-08-04 22:55 ` Andrew Morton
2009-08-05 0:47 ` Phillip Lougher
2009-08-05 0:57 ` H. Peter Anvin
2009-08-05 1:32 ` Phillip Lougher
2009-08-05 1:08 ` Andrew Morton
2009-08-05 2:06 ` Phillip Lougher
2009-07-23 17:11 ` [PATCH 4/5] Add support for LZO-compressed kernels for ARM Albin Tonnerre
[not found] ` <0022152d7fe9b6dbcf046f4d04a6@google.com>
2009-07-22 16:08 ` H. Peter Anvin [this message]
2009-07-22 16:50 ` [PATCH 3/5] Add support for LZO-compressed kernels Albin Tonnerre
2009-07-29 13:51 ` [PATCH 3/5 v2] " Albin Tonnerre
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