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

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Message-ID: <490AE792.60200@cosmosbay.com>
Date:	Fri, 31 Oct 2008 12:10:10 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	zbr@...emap.net, rjw@...k.pl, mingo@...e.hu,
	s0mbre@...rvice.net.ru, a.p.zijlstra@...llo.nl,
	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>, efault@....de,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

Ilpo Järvinen a écrit :
> On Fri, 31 Oct 2008, Eric Dumazet wrote:
> 
>> David Miller a écrit :
>> > From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
>> > Date: Fri, 31 Oct 2008 11:40:16 +0200 (EET)
>> > > > Let me remind that it is just a single process, so no ping-pong 
>> & other
>> > > lock related cache effects should play any significant role here, 
>> no? (I'm
>> > > no expert though :-)).
>> > > Not locks or ping-pongs perhaps, I guess.  So it just sends and
>> > receives over a socket, implementing both ends of the communication
>> > in the same process?
>> > > If hash chain conflicts do happen for those 2 sockets, just 
>> traversing
>> > the chain 2 entries deep could show up.
>>
>> tbench is very sensible to cache line ping-pongs (on SMP machines of 
>> course)
> 
> ...Sorry to disappoint you but we were discussion there on my AIM9 
> tcp_test results :-).
> 

Well, before you added AIM9 on this topic, we were focusing on tbench :)

Sorry to disappoint you :)

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