netdev - Re: tbench wrt. loopback TSO

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Message-ID: <20081027141332.GA4691@ioremap.net>
Date:	Mon, 27 Oct 2008 17:13:32 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, efault@....de, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: tbench wrt. loopback TSO

On Mon, Oct 27, 2008 at 09:49:21AM +0200, Ilpo Järvinen (ilpo.jarvinen@...sinki.fi) wrote:
> > > That's what I got with the current tree for 8 threads on a 4-way 32-bit
> > > Xeons (2 physical CPUs) and 8gb of ram:
> > > gso/tso off: 361.367
> > > tso/gso on:  354.635
> > 
> > Yes, it might do this, in which case tcp_tso_should_defer() simply needs
> > some tweaking.
> 
> Good point, could you Evgeniy verify first if simple goto send_now; in 
> beginning there recovers it all...

With direct goto at the begining of the tcp_tso_should_defer()
and 4403b406 commit git tree (was current yesterday night)
I got following numbers: 

with goto:
tso/gso  on: 358.976, 357.699
tso/gso off: 368.016, 367.079

no goto
tso/gso  on: 353.656, 354.791
tso/gso off: 364.8, 365.85

So tcp_tso_should_defer() adds additional problems not counted in
tso/gso changes.

-- 
	Evgeniy Polyakov
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