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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: Wed, 29 Sep 2004 14:50:50 -0700
Cc: jheffner@xxxxxxx, ak@xxxxxxx, herbert@xxxxxxxxxxxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <415B24C0.2020208@xxxxxxxxxx>
References: <Pine.NEB.4.33.0409291648560.3434-100000@xxxxxxxxxxxxxx> <415B24C0.2020208@xxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Wed, 29 Sep 2004 14:10:24 -0700
Nivedita Singhvi <niv@xxxxxxxxxx> wrote:

> I just crashed too, no backtrace. netperf tcp stream test,
> and was on bk14 + dave's 5 patches, p4/e1000 -> Intel Pentium
> M proc (1.7GHz). Going to repeat on slower SMPs with serial
> console, get more info..

I can reproduce this now, it has to do with some weird combinations
of packet loss and SACK'ing.  It's one of the BUG_ON() assertions
triggering in tcp_tso_acked() as I suspected in Andi's first report.

Working on a fix.

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