linux-kernel - Re: [kernel.org users] XZ Migration discussion

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Date:	Sun, 14 Feb 2010 13:04:45 -0800 (PST)
From:	david@...g.hm
To:	Stefan Richter <stefanr@...6.in-berlin.de>
cc:	Pavel Machek <pavel@....cz>, Jean Delvare <khali@...ux-fr.org>,
	Willy Tarreau <w@....eu>, mirrors@...nel.org,
	lasse.collin@...aani.org,
	linux-kernel <linux-kernel@...r.kernel.org>, users@...nel.org,
	"FTPAdmin Kernel.org" <ftpadmin@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [kernel.org users] XZ Migration discussion

On Sun, 14 Feb 2010, Stefan Richter wrote:

> Pavel Machek wrote:
> [Jean Delvare wrote]
>>> I have an old, slow machine here which I am going to use to perform
>>> some real world testing, and I'll post the results when I'm done. But I
>>> suspect that building a kernel on this machine, even a small one with
>>> just the drivers it needs, will take much longer than unpacking the
>>> sources. So anyone worrying about performance would rather rely on
>>> cross-compilation, and in turn can afford whatever decompression tool
>>> is needed.
>>
>> On zaurus, kernel compilation takes 4 hours. (I.e. "one night"). So
>> that one is ... well ... done overnight.
>>
>> Untar is something I normally wait for, since you need to run
>> (interactive) oldconfig after that.
>
> If the download takes m minutes and unpacking and unarchiving tar.gz
> takes another n minutes, what difference does it make for this workflow
> when instead m + p minutes are spent for download + unpacking and
> unarchiving tar.bz2 or tar.xz?

The difference is that the user is waiting for the n or m minutes, but 
goes off and does something else for the p minutes.

So it doesn't really matter if the compile takes 1 hour or 6 hours. As 
Pavel noted, this is done overnight and it doesn't matter if it gets done 
at 2am or 6am.

But the uncompression has a user waiting for it (to do the config step), 
so here it makes a big difference if it takes 6 minutes ot 8 minutes.

David Lang
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