Re: [tcpm] A question about PTO/RTO rescheduling in RACK draft

[hiren panchasara <[e-mail]>]

On 04/18/19 at 09:18P, Neal Cardwell wrote:
> On Wed, Apr 17, 2019 at 5:15 PM hiren panchasara
> <[e-mail]> wrote:
> > I'll keep this to the point I thought got missed.
> >
> > https://tools.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rack-04.txt
> >
> > Is where we can see `Scheduling a loss probe` getting changed.
> > Specifically, following condition has been removed from -04:
> >
> >    3.  The connection is either limited by congestion window (the data
> >        in flight matches or exceeds the cwnd) or application-limited
> >        (there is no unsent data that the receiver window allows to be
> >        sent).
> >
> > And afaict, Linux code still has this condition in. If you can provide
> > some rationale behind this change, it'd be great.
> 
> We removed the code for that condition from Linux around 2017-12-13,
> in this commit (GPLv2 patch in this link):
>   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/net/ipv4/tcp_output.c?id=b4f70c3d4ec32a2ff4c62e1e2da0da5f55fe12bd
> 
> The commit description explains the rationale for removing that
> condition, but here is a paraphrased description of the rationale for
> removing that code and that condition in the draft:
[skip]

Thanks a lot. This makes sense.
Apologies for misreading the code.

Cheers,
Hiren