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Re: [patch 05/13] remove last_rx update from loopback device

To: Rick Jones <rick.jones2@xxxxxx>
Subject: Re: [patch 05/13] remove last_rx update from loopback device
From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Tue, 15 Mar 2005 17:23:25 -0800
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>, jgarzik@xxxxxxxxx, netdev@xxxxxxxxxxx, christoph@xxxxxxxxxx, nirajk@xxxxxxxxxxxxxx, christoph@xxxxxxxxxxx, Shai@xxxxxxxxxxxx
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Rick Jones wrote:

These loopback driver SMP optimizations are starting to really
driver me crazy.

Correct or not, I suspect there are a non-trivial number of folks out there who use loopback performance as an indicator of over the network performance or at least of stack path length (less driver).

I hope not the former. Given that loopback performance is *significantly* faster than network performance, increasing the performance of the loopback driver in these somewhat artificial ways (that differ from the real network device path) simply *increases* the inaccuracy of their testing and the conclusions they can draw from it ;).


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