netdev - Re: Socket buffer sizes with autotuning

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Message-Id: <20080424.233643.250240829.davem@davemloft.net>
Date:	Thu, 24 Apr 2008 23:36:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	andi@...stfloor.org, johnwheffner@...il.com, rick.jones2@...com,
	netdev@...r.kernel.org
Subject: Re: Socket buffer sizes with autotuning

From: "Tom Herbert" <therbert@...gle.com>
Date: Thu, 24 Apr 2008 22:34:50 -0700

> Queuing in the host as opposed to in the TX NIC might be beneficial to make
> work conserving queuing disciplines more effective, since once a packet is
> queued in the NIC the host can no longer perform any more scheduling on
> it.    In fact, we have been working on a mechanism to dynamically limit
> queuing in the NIC (by number of bytes), so that more packets will be queued
> in host.  This seems to give better results with some of the qdiscs (I can
> post a patch if there's interest in this).

This work is interesting, but doesn't it make more sense to limit by
number of packets instead of bytes?

No intermediate node that I know of drops bytes, they drop packets
instead :-)
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