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Re: bad TSO performance in 2.6.9-rc2-BK

To: Nivedita Singhvi <niv@xxxxxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Tue, 28 Sep 2004 13:38:30 -0700
Cc: herbert@xxxxxxxxxxxxxxxxxxx, jheffner@xxxxxxx, ak@xxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <415910D2.7010808@us.ibm.com>
References: <20040923161141.4ea9be4c.davem@davemloft.net> <Pine.NEB.4.33.0409271416360.14606-100000@dexter.psc.edu> <20040927160411.22b44f48.davem@davemloft.net> <20040927233639.GA8333@gondor.apana.org.au> <20040927171356.6a59d039.davem@davemloft.net> <415910D2.7010808@us.ibm.com>
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On Tue, 28 Sep 2004 00:20:50 -0700
Nivedita Singhvi <niv@xxxxxxxxxx> wrote:

> David S. Miller wrote:
> 
> > Bright minds think alike.  :-)  We have to keep all the other
> > packet counts in sync as well.
> > 
> > Andi, others, forget my previous hack patch to tcp_clean_rtx_queue()
> > and give this more complete patch a try.
> > 
> > I'm getting really good results here on my tg3<-->tg3 setup using
> > this patch.
> 
> Dave, were you seeing a significant number of retransmissions
> and sacks in your tests?

None.  I am working on a local network through a gigabit switch.

I will work on making sure cases involving loss work correctly,
via the netem module, before I submit these fixes upstream to
Linus.  Likely I will complete this work today.

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