netdev - Re: using software TSO on non-TSO capable netdevices

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Message-ID: <Pine.LNX.4.64.0807310942130.4551@wrl-59.cs.helsinki.fi>
Date:	Thu, 31 Jul 2008 09:55:57 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
cc:	Lennert Buytenhek <buytenh@...tstofly.org>,
	David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>, akarkare@...vell.com,
	nico@....org
Subject: Re: using software TSO on non-TSO capable netdevices

On Thu, 31 Jul 2008, Herbert Xu wrote:

> On Thu, Jul 31, 2008 at 04:36:52AM +0200, Lennert Buytenhek wrote:
> >
> > The maximum that splice will allow -- PIPE_BUFFERS * PAGE_SIZE.
> > 
> > I.e. the writes should be large enough.
> 
> Have you looked at the packet dump?

...That would be helpful indeed.

> Maybe it was being constrained by the receiver/congestion windows.

The thing that came into my mind is that the link might still be fast 
enough to make the transfer application limited, can you try setting 
/proc/sys/net/ipv4/tcp_slow_start_after_idle to zero and retest.

-- 
 i.
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