netdev - Re: A Linux TCP SACK Question

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Date:	Tue, 8 Apr 2008 07:07:51 -0700
From:	"John Heffner" <johnwheffner@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	"Wenji Wu" <wenji@...l.gov>, "Sangtae Ha" <sangtae.ha@...il.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: A Linux TCP SACK Question

On Mon, Apr 7, 2008 at 11:36 PM, Ilpo Järvinen
<ilpo.jarvinen@...sinki.fi> wrote:
>
> On Mon, 7 Apr 2008, Wenji Wu wrote:
>
>  > >I don't think reorderings frequently happened in your directly
>  > >connected networking scenario. Please post your tcpdump file for
>  > >clearing out all doubts.
>  >
>  > https://plone3.fnal.gov/P0/WAN/Members/wenji/tcp_dump_files_sack/
>  >
>  > Two tcpdump files: one with SACK on, the other with SACK off. The test
>  > configures described in my previous emails.
>
>  NewReno never retransmitted anything in them (except at the very end of
>  the transfer). Probably something related to how tp->reordering behaves
>  I suppose...

Yes, this looks very suspicious.  Can we see this again with TSO off?

  -John
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