[Bloat] passive network delay monitoring utility

[Bloat] passive network delay monitoring utility

[Kathleen Nichols]

Hi,
I've just made one of the tools I use to measure network delay
available with a GPLv2 license. Perhaps it will be of intererst.

https://github.com/pollere/pping

	Kathie

Re: [Bloat] passive network delay monitoring utility

[Jim Gettys]

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Those of you who have not looked at pping should do so.

See: http://pollere.net/pping.html for a description, and look at the
slides linked to on that page.

In particular, it would be sweet to run this on a home router, as you can
monitor latency simultaneously in either direction.  Then we can point a
finger properly at the ISP or at the WiFi in the home network (encouraging
either/both to get fixed).

Anyone interested in undertaking such a project with me, please drop me a
note.

The only downside is that pping is a C++ app, which makes it big for a home
router, so it can't be used on old small home routers due to footprint
issues; but many current home routers would have space for it.

                                                 - Jim




On Sun, Apr 30, 2017 at 8:41 PM, Kathleen Nichols <nichols@pollere.com>
wrote:

>
> Hi,
> I've just made one of the tools I use to measure network delay
> available with a GPLv2 license. Perhaps it will be of intererst.
>
> https://github.com/pollere/pping
>
>         Kathie
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat
>

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Re: [Bloat] passive network delay monitoring utility

[Eric Dumazet]

I had the honor to attend Kathleen presentation at Google ;)

I then worked on making sure TCP TS TSval  would use 1ms units,
regardless of CONFIG_HZ option in the kernel, since apparently some
distros/devices use HZ=250 or even HZ=100

This should be in linux-4.13 when released.

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=9a568de4818dea9a05af141046bd3e589245ab83

Cover letter for the patch series :

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=e26925ec03b31f5ae4c1fc544515486229334ef9


On Tue, 2017-05-23 at 15:22 -0400, Jim Gettys wrote:
> Those of you who have not looked at pping should do so.
> 
> 
> See: http://pollere.net/pping.html for a description, and look at the
> slides linked to on that page.
> 
> 
> In particular, it would be sweet to run this on a home router, as you
> can monitor latency simultaneously in either direction.  Then we can
> point a finger properly at the ISP or at the WiFi in the home network
> (encouraging either/both to get fixed).
> 
> 
> Anyone interested in undertaking such a project with me, please drop
> me a note.
> 
> 
> The only downside is that pping is a C++ app, which makes it big for a
> home router, so it can't be used on old small home routers due to
> footprint issues; but many current home routers would have space for
> it.
> 
> 
>                                                  - Jim
> 
> 
> 
> 
> 
> 
> 
> On Sun, Apr 30, 2017 at 8:41 PM, Kathleen Nichols
> <nichols@pollere.com> wrote:
>         
>         Hi,
>         I've just made one of the tools I use to measure network delay
>         available with a GPLv2 license. Perhaps it will be of
>         intererst.
>         
>         https://github.com/pollere/pping
>         
>                 Kathie
>         _______________________________________________
>         Bloat mailing list
>         Bloat@lists.bufferbloat.net
>         https://lists.bufferbloat.net/listinfo/bloat
> 
> 
> _______________________________________________
> Bloat mailing list
> Bloat@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/bloat

Re: [Bloat] passive network delay monitoring utility

[Kathleen Nichols]

Eric,

You are the king of Making The Right Thing Happen.

	Kathie

On 5/23/17 12:50 PM, Eric Dumazet wrote:
> I had the honor to attend Kathleen presentation at Google ;)
> 
> I then worked on making sure TCP TS TSval  would use 1ms units,
> regardless of CONFIG_HZ option in the kernel, since apparently some
> distros/devices use HZ=250 or even HZ=100
> 
> This should be in linux-4.13 when released.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=9a568de4818dea9a05af141046bd3e589245ab83
> 
> Cover letter for the patch series :
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=e26925ec03b31f5ae4c1fc544515486229334ef9
> 
> 
> On Tue, 2017-05-23 at 15:22 -0400, Jim Gettys wrote:
>> Those of you who have not looked at pping should do so.
>>
>>
>> See: http://pollere.net/pping.html for a description, and look at the
>> slides linked to on that page.
>>
>>
>> In particular, it would be sweet to run this on a home router, as you
>> can monitor latency simultaneously in either direction.  Then we can
>> point a finger properly at the ISP or at the WiFi in the home network
>> (encouraging either/both to get fixed).
>>
>>
>> Anyone interested in undertaking such a project with me, please drop
>> me a note.
>>
>>
>> The only downside is that pping is a C++ app, which makes it big for a
>> home router, so it can't be used on old small home routers due to
>> footprint issues; but many current home routers would have space for
>> it.
>>
>>
>>                                                  - Jim
>>
>>
>>
>>
>>
>>
>>
>> On Sun, Apr 30, 2017 at 8:41 PM, Kathleen Nichols
>> <nichols@pollere.com> wrote:
>>         
>>         Hi,
>>         I've just made one of the tools I use to measure network delay
>>         available with a GPLv2 license. Perhaps it will be of
>>         intererst.
>>         
>>         https://github.com/pollere/pping
>>         
>>                 Kathie
>>         _______________________________________________
>>         Bloat mailing list
>>         Bloat@lists.bufferbloat.net
>>         https://lists.bufferbloat.net/listinfo/bloat
>>
>>
>> _______________________________________________
>> Bloat mailing list
>> Bloat@lists.bufferbloat.net
>> https://lists.bufferbloat.net/listinfo/bloat
> 
> 

Re: [Bloat] passive network delay monitoring utility

[Kathleen Nichols]

Couple of things. First, it's probably not hard to write a pping in
other languages
but c++ is my go to. (I am sort of learning javascript right now.) I
think it's great
if we get other versions.

Secondly, for anyone who seriously wants to localize delay in their
application/device/
what-have-you, I have other ways of doing that and I'm happy to discuss
working with
you but there will be $ involved.

Finally, I've been using my infant javascript skills (see paragraph 1)
to make a sort of
web page display for pping and I do plan to open source it when it's not
too embarassing but I'd be happy to connect with other people with a
serious interest in visualizing the
data in a meaningful way.

	Kathie

On 5/23/17 12:22 PM, Jim Gettys wrote:
> Those of you who have not looked at pping should do so.
> 
> See: http://pollere.net/pping.html for a description, and look at the
> slides linked to on that page.
> 
> In particular, it would be sweet to run this on a home router, as you
> can monitor latency simultaneously in either direction.  Then we can
> point a finger properly at the ISP or at the WiFi in the home network
> (encouraging either/both to get fixed).
> 
> Anyone interested in undertaking such a project with me, please drop me
> a note.
> 
> The only downside is that pping is a C++ app, which makes it big for a
> home router, so it can't be used on old small home routers due to
> footprint issues; but many current home routers would have space for it.
> 
>                                                  - Jim
> 
> 
> 
> 
> On Sun, Apr 30, 2017 at 8:41 PM, Kathleen Nichols <nichols@pollere.com
> <mailto:nichols@pollere.com>> wrote:
> 
> 
>     Hi,
>     I've just made one of the tools I use to measure network delay
>     available with a GPLv2 license. Perhaps it will be of intererst.
> 
>     https://github.com/pollere/pping <https://github.com/pollere/pping>
> 
>             Kathie
>     _______________________________________________
>     Bloat mailing list
>     Bloat@lists.bufferbloat.net <mailto:Bloat@lists.bufferbloat.net>
>     https://lists.bufferbloat.net/listinfo/bloat
>     <https://lists.bufferbloat.net/listinfo/bloat>
> 
>