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Re: [RFC] TCP congestion schedulers

To: John Heffner <jheffner@xxxxxxx>
Subject: Re: [RFC] TCP congestion schedulers
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Mon, 21 Mar 2005 13:51:54 -0800
Cc: ak@xxxxxx, shemminger@xxxxxxxx, baruch@xxxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.58.0503211605300.6729@xxxxxxxxxxxxxx>
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On Mon, 21 Mar 2005 16:25:56 -0500 (EST)
John Heffner <jheffner@xxxxxxx> wrote:

> Would you really expect a single extra indirect call per ack to have a
> significant performance impact?  This is surprising to me.  Where does the
> cost come from?  Replacing instruction cache lines?

Maybe not for ACK processing (that's very thick already) but
perhaps for a lighter fast path definitely so.

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