netdev - Re: pktgen terminating condition

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Message-Id: <20070830.221909.28790079.davem@davemloft.net>
Date:	Thu, 30 Aug 2007 22:19:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hadi@...erus.ca
Cc:	Robert.Olsson@...a.slu.se, mandeep.baines@...il.com,
	rick.jones2@...com, msb@...gle.com, netdev@...r.kernel.org,
	grundler@...gle.com, robert.olsson@....uu.se, venza@...wnhat.org
Subject: Re: pktgen terminating condition

From: jamal <hadi@...erus.ca>
Date: Thu, 30 Aug 2007 08:08:40 -0400

> I was confusing it with another issue where pktgen could send a lot of
> packets without waiting for them to be freed; there are some drivers
> (10G) which may hold onto 8K skbs. A gazillion ooms start spewing ;-> My
> thinking in resolving that was to do something like waht sockets do and
> charge pktgen so it doesnt have too many outstanding packets in flight.

You could implement this quite simply using skb->destructor.

It will add some atomics, so on weaker pktgen source systems
it might decrease the generators rate.
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