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Re: bad TSO performance in 2.6.9-rc2-BK

To: "David S. Miller" <davem@xxxxxxxxxxxxx>
Subject: Re: bad TSO performance in 2.6.9-rc2-BK
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Sep 2004 10:40:38 +1000
Cc: ak@xxxxxxx, niv@xxxxxxxxxx, andy.grover@xxxxxxxxx, anton@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <20040924001225.GA5051@xxxxxxxxxxxxxxxxxxx>
References: <20040923161141.4ea9be4c.davem@xxxxxxxxxxxxx> <E1CAdCy-0001FM-00@xxxxxxxxxxxxxxxxxxxxxxxx> <20040923164149.5368d291.davem@xxxxxxxxxxxxx> <20040924001225.GA5051@xxxxxxxxxxxxxxxxxxx>
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On Fri, Sep 24, 2004 at 10:12:25AM +1000, herbert wrote:
> 
> How about this? We always to treat TSO frames as one packet.  We
> continue to obey the congestion window by starting with a TSO MSS
> that is small enough.  We increase the TSO MSS as the congestion
> window goes up.
> 
> That should work, no?

Probably not.  There many things (such as snd_cwnd) in the stack
that doesn't work properly when the mss changes drastically like this.
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