netdev - Re: RE: A Linux TCP SACK Question

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Message-ID: <Pine.LNX.4.64.0804152005110.27927@wrl-59.cs.helsinki.fi>
Date:	Tue, 15 Apr 2008 20:08:45 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	John Heffner <johnwheffner@...il.com>
cc:	Wenji Wu <wenji@...l.gov>, Netdev <netdev@...r.kernel.org>
Subject: Re: RE: A Linux TCP SACK Question

On Tue, 15 Apr 2008, John Heffner wrote:

> On Tue, Apr 15, 2008 at 9:39 AM, Wenji Wu <wenji@...l.gov> wrote:
> >  SlowStart            0
> >  CongAvoid            0
> >  CongestionSignals    3
> >  OtherReductions      13166
> >  X_OtherReductionsCV  0
> >  X_OtherReductionsCM  13166
> >  CongestionOverCount  37
> >  CurCwnd              10136
> >
> > MaxCwnd              173760
> >  CurSsthresh          94894680
> >  LimCwnd              4294965848
> >  MaxSsthresh          94894680
> >  MinSsthresh          46336
> 
> 
> We can see that in both cases you are getting throttled by
> tcp_moderate_cwnd (X_OtherReductionsCM).  I'm not sure offhand why
> it's reaching this code - I would have thought that the high
> tp->reordering would prevent this.  Ilpo, do you have any insights?

What makes you think so? It's called from tcp_try_to_open as anyone can 
read from the source, basically when our state is CA_Disorder (some very 
small portion might happen in ca_recovery besides that).


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