linux-kernel - Re: [tbench regression fixes]: digging out smelly deadmen.

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Message-ID: <490B7284.2010003@cosmosbay.com>
Date:	Fri, 31 Oct 2008 22:03:00 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>, ilpo.jarvinen@...sinki.fi,
	rjw@...k.pl, mingo@...e.hu, s0mbre@...rvice.net.ru,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, efault@....de, akpm@...ux-foundation.org
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

Evgeniy Polyakov a écrit :
> On Fri, Oct 31, 2008 at 12:57:13PM -0700, Stephen Hemminger (shemminger@...tta.com) wrote:
>> Why bother with last_rx at all on loopback.  I have been thinking
>> we should figure out a way to get rid of last_rx all together. It only
>> seems to be used by bonding, and the bonding driver could do the calculation
>> in its receive handling.
> 
> Not related to the regression: bug will be just papered out by this
> changes. Having bonding on loopback is somewhat strange idea, but still
> this kind of changes is an attempt to make a good play in the bad game:
> this loopback-only optimization does not fix the problem.
> 

Just to be clear, this change was not meant to be committed.
It already was rejected by David some years ago (2005, and 2006)

http://www.mail-archive.com/netdev@vger.kernel.org/msg07382.html

If you read my mail, I was *only* saying that tbench results can be sensible to
cache line ping pongs. tbench is a crazy benchmark, and only is a crazy benchmark.

Optimizing linux for tbench sake would be .... crazy ?

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