Using zsync for .deb downloads: initial benchmark results

Scott Ritchie scott at
Thu Jul 16 00:39:41 BST 2009

Mike Rooney wrote:
> On Wed, Jul 15, 2009 at 2:32 PM, Scott Ritchie<scott at> wrote:
>> Mike Rooney wrote:
>>> On Wed, Jul 15, 2009 at 12:10 PM, Wouter Stomp<wouterstomp at> wrote:
>>>> On Wed, Jul 15, 2009 at 2:37 AM, Paul Sladen<ubuntu at> wrote:
>>>>> On Tue, 14 Jul 2009, Martin Pitt wrote:
>>>>>> Lars Wirzenius [2009-07-14 19:19 +0300]:
>>>>>>> is a 25% reduction in download sizes worthwhile to pursue?
>>>>> A daily fetch of Packages.gz for main/restricted/universe/multiverse/* is
>>>>> ~10MB (IIRC), times 30 days per month and X million users, this is where the
>>>>> low-hanging fruit is likely to be.
>>>> More low hanging fruit: disable the source package repositories by
>>>> default (and provide some easy/automatic way to reenable them when
>>>> needed). Probably >90% of all people never use them and this would
>>>> save tons of bandwidth and time.
>>> I noticed this as well; the universe source list is something like
>>> 10MB by itself. I think we could check for updates a lot faster if
>>> these were disabled by default but trivial to enable. I think just
>>> commenting them out by default would work fine, anyone advanced enough
>>> to want to apt-get source can handle uncommenting lines in a text file
>>> I would suspect.
>> I thought they WERE commented out by default, at least with new
>> installs.  This is equivalent to being unchecked in
>> System->Administration->Software Sources.
> It doesn't appear that way, I just downloaded the Jaunty 64 bit ISO
> and created a VM, and they are indeed present in sources.list, not
> commented out. The check box in Software Sources is also "enabled",
> though it works oddly and doesn't show a check, it just has an orange
> background instead of a plain one if you "uncheck" it.
> My Jaunty and Karmic boxes also seem have sources enabled by default.

Hmm that is wrong then -- mind filing a bug?  (Or linking one)

Scott Ritchie

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