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Re: [PATCH] x86/boot: Support uncompressed kernel

From Yinghai Lu <yinghai@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/boot: Support uncompressed kernel
Date 2017-03-23 16:10 +0100
Message-ID <tocxd-3SR-53@gated-at.bofh.it> (permalink)
References <toaF4-2Eh-13@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Mar 23, 2017 at 5:51 AM, Chao Peng <chao.p.peng@linux.intel.com> wrote:
> Compressed kernel has its own drawback: uncompressing takes time. Even
> though the time is short enough to ignore for most cases but for cases that
> time is critical this is still a big number. In our on-going optimization
> for kernel boot time, the measured overall kernel boot time is ~90ms while
> the uncompressing takes ~50ms with gzip.
>
> The patch adds a 'CONFIG_KERNEL_RAW' configure choice so the built binary
> can have no uncompressing at all. The experiment shows:
>
>     kernel               kernel size    time in decompress_kernel
>     compressed (gzip)    3.3M           53ms
>     uncompressed         14M            3ms

How about the time difference for bootloader to read kernel from
flash/disk/network to ram?

Thanks

Yinghai

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Thread

[PATCH] x86/boot: Support uncompressed kernel Chao Peng <chao.p.peng@linux.intel.com> - 2017-03-23 14:10 +0100
  Re: [PATCH] x86/boot: Support uncompressed kernel Yinghai Lu <yinghai@kernel.org> - 2017-03-23 16:10 +0100
    Re: [PATCH] x86/boot: Support uncompressed kernel Sergey Senozhatsky <sergey.senozhatsky@gmail.com> - 2017-03-23 16:40 +0100
      Re: [PATCH] x86/boot: Support uncompressed kernel Chao Peng <chao.p.peng@linux.intel.com> - 2017-03-24 06:40 +0100
        Re: [PATCH] x86/boot: Support uncompressed kernel Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2017-03-27 10:10 +0200
          Re: [PATCH] x86/boot: Support uncompressed kernel Chao Peng <chao.p.peng@linux.intel.com> - 2017-03-27 11:30 +0200
          Re: [PATCH] x86/boot: Support uncompressed kernel Michal Marek <mmarek@suse.com> - 2017-03-27 14:00 +0200
            Re: [PATCH] x86/boot: Support uncompressed kernel Arnd Bergmann <arnd@arndb.de> - 2017-03-27 15:30 +0200
  Re: [PATCH] x86/boot: Support uncompressed kernel Michal Marek <mmarek@suse.com> - 2017-03-24 09:30 +0100

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