should we consider making CoDel the default to combat bufferbloat?

[Michal Schmidt]

Dne 16.10.2014 v 16:19 Josh Boyer napsal(a):
> On Wed, Oct 15, 2014 at 9:02 PM, Matthew Miller
> <mattdm at fedoraproject.org> wrote:
>> Reading https://lwn.net/Articles/616241/, getting myself in happily over my
>> level of actual knowledge about the state of things.
>>
>>  From that article, it seems like it might be worth trying
>> net.core.default_qdisc = fq_codel by default. Just tossing this out there
>> for the consideration of someone who really knows what they're talking about
>> in this area.
>
> I think the answer, as usual, is: "It depends."  It's not a silver
> bullet for all problems, but it would probably help in some cases.  I
> would actually think Server could use this more than Workstation, as
> the article points out that wireless networking has a number of other
> issues to consider.  I've added Neil on CC, who's probably much more
> equipped to weigh in on this than either of us.
>
> In any case, if this change is done it should be done in the
> initscripts package.  It's a runtime tunable and we don't need to be
> patching the kernel to change the default.

Josh,
we're considering adding "net.core.default_qdisc = fq_codel" to
the default sysctl config shipped with systemd.

Assuming we do that, would you change CONFIG_NET_SCH_FQ_CODEL
in the Fedora config to make it built-in rather than a module?

As pointed out by TomH in https://lwn.net/Articles/616505/, having it
as a module may require loosening the SELinux policy.
Also it seems silly to have to load a module for a distro's default.

Thanks,
Michal