From: Chao Peng <chao.p.peng@linux.intel.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Yinghai Lu <yinghai@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
the arch/x86 maintainers <x86@kernel.org>,
Michal Marek <mmarek@suse.com>, Kees Cook <keescook@chromium.org>,
Baoquan He <bhe@redhat.com>, "H.J. Lu" <hjl.tools@gmail.com>,
Paul Bolle <pebolle@tiscali.nl>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Borislav Petkov <bp@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>, Petr Mladek <pmladek@suse.com>,
"David S. Miller" <davem@davemloft.net>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Garnier <thgarnie@google.com>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Tejun Heo <tj@kernel.org>, Daniel Mack <daniel@zonque.org>,
Helge Deller <deller@gmx.de>, Rik van Riel <riel@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-kbuild <linux-kbuild@vger.kernel.org>
Subject: Re: [PATCH] x86/boot: Support uncompressed kernel
Date: Mon, 27 Mar 2017 17:25:44 +0800 [thread overview]
Message-ID: <1490606744.3661.7.camel@linux.intel.com> (raw)
In-Reply-To: <20170327075817.bb7wda62fcuvfa4b@linutronix.de>
On Mon, 2017-03-27 at 09:58 +0200, Sebastian Andrzej Siewior wrote:
> On 2017-03-24 13:35:40 [+0800], Chao Peng wrote:
> >
> >
> > >
> > > >
> > > > >
> > > > > kernel kernel size time in
> > > > > decompress_kernel
> > > > > compressed (gzip) 3.3M 53ms
> > > > > uncompressed 14M 3ms
> > > >
> > Exactly, LZ4 is the fastest. It takes 16ms to complete the
> > decompression. Still sounds a little longer when compared to
> > uncompressed kernel.
>
> Are we seriously talking here about one-time improvement of 13ms
> boot time?
The usage model for us is to lunch kernel in virtual machine and there
will be thousands of instances lunched and shutdowned/re-lunched
frequently, so every single million-second helps. And 13ms means 20%
improvement to our existing optimization (the other part besides
decompression is optimized to ~40ms).
Chao
>
> >
> > Chao
>
> Sebastian
next prev parent reply other threads:[~2017-03-27 9:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-23 12:51 [PATCH] x86/boot: Support uncompressed kernel Chao Peng
2017-03-23 15:07 ` Yinghai Lu
2017-03-23 15:31 ` Sergey Senozhatsky
2017-03-24 5:35 ` Chao Peng
2017-03-27 7:58 ` Sebastian Andrzej Siewior
2017-03-27 9:25 ` Chao Peng [this message]
2017-03-27 11:47 ` Michal Marek
2017-03-27 13:25 ` Arnd Bergmann
2017-03-28 12:01 ` Chao Peng
2017-03-28 22:38 ` H. Peter Anvin
2017-03-28 22:55 ` Andy Lutomirski
2017-03-24 8:09 ` Michal Marek
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