netdev - Re: [RFC] New driver API to speed up small packets xmits

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Message-Id: <1178820423.17393.3.camel@w-sridhar2.beaverton.ibm.com>
Date:	Thu, 10 May 2007 11:07:03 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Krishna Kumar2 <krkumar2@...ibm.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org
Subject: Re: [RFC] New driver API to speed up small packets xmits

On Thu, 2007-05-10 at 10:19 -0700, Rick Jones wrote:
> > It is the reverse - GSO will segment one super-packet just before calling
> > the driver so that the stack is traversed only once. In my case, I am
> > trying to send out multiple skbs, possibly small packets, in one shot.
> > GSO will not help for small packets.
> 
> If there are small packets that implies small sends, which suggests that they 
> would be coalesced either implicitly by the Nagle algorithm or explicitly with 
> TCP_CORK no?

small packets belonging to the same connection could be coalesced by
TCP, but this may help the case where multiple parallel connections are
sending small packets.

Thanks
Sridhar

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