Re: [Xen-devel] [RFC 2/7] linux-stubdomain: Compile Linux

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Thu, May 14, 2015 at 10:28 AM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> On Thu, 2015-05-14 at 10:08 +0100, George Dunlap wrote:
>> On Fri, Feb 6, 2015 at 5:45 PM, Stefano Stabellini
>> <stefano.stabellini@xxxxxxxxxxxxx> wrote:
>> >> >> +LINUX_URL=ftp://ftp.kernel.org/pub/linux/kernel/v3.x/$(LINUX_V).tar.xz
>> >> >> +
>> >> >> +all: $(VMLINUZ)
>> >> >
>> >> > I think it is best if we git clone it.
>> >>
>> >> Is that still true if unpatched 3.18.6 works?  I don't know if there
>> >> is a desire to reduce load on kernel.org, for example.
>> >
>> > That's a good point. I think git clone would be more inline with any
>> > other external project that we use.  However I'll let the other
>> > maintainers decide on this.
>>
>> It takes a *loooooooong* time to download a full Linux git tree, and
>> it takes up a huge amount of disk space.  It would be a lot more
>> convenient to be able to just download a tarball.
>
> git clone --depth=<some small N> to create a shallow clone?

So my unscientific poll (more details below)

1. Download tarball: 80MB, 111s (<2m)

2. git clone --depth 1: 138MiB, 392s. (~6m30s)

I'd just go for the tarball, but I'll leave that decision up to you guys.

 -George

$ time wget ftp://ftp.kernel.org/pub/linux/kernel/v3.x/linux-3.18.8.tar.xz
--2015-05-18 11:12:05--
ftp://ftp.kernel.org/pub/linux/kernel/v3.x/linux-3.18.8.tar.xz
           => âlinux-3.18.8.tar.xzâ
Resolving ftp.kernel.org (ftp.kernel.org)... 199.204.44.194,
149.20.4.69, 198.145.20.140
Connecting to ftp.kernel.org (ftp.kernel.org)|199.204.44.194|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done.    ==> PWD ... done.
==> TYPE I ... done.  ==> CWD (1) /pub/linux/kernel/v3.x ... done.
==> SIZE linux-3.18.8.tar.xz ... 80954240
==> PASV ... done.    ==> RETR linux-3.18.8.tar.xz ... done.
Length: 80954240 (77M) (unauthoritative)

100%[=====================================================================================================================================================================================================>]
80,954,240   723KB/s   in 1m 51s

2015-05-18 11:13:57 (711 KB/s) - âlinux-3.18.8.tar.xzâ saved [80954240]


real    1m52.548s
user    0m0.318s
sys    0m1.894s


$ time git clone --depth 1 --branch v3.18
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Cloning into 'linux'...
remote: Counting objects: 50728, done.
remote: Compressing objects: 100% (48908/48908), done.
remote: Total 50728 (delta 3388), reused 21833 (delta 1202)
Receiving objects: 100% (50728/50728), 138.44 MiB | 269.00 KiB/s, done.
Resolving deltas: 100% (3388/3388), done.
Checking connectivity... done.
Note: checking out 'b2776bf7149bddd1f4161f14f79520f17fc1d71d'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b new_branch_name

Checking out files: 100% (47986/47986), done.

real    6m32.968s
user    0m11.522s
sys    0m4.815s


>
> Ian.
>
>
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