netdev - Re: Socket buffer sizes with autotuning

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Date:	Fri, 25 Apr 2008 00:46:34 -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: Fri, 25 Apr 2008 00:42:03 -0700

> If NIC is interrupt driven, enough data must be queued to span
> consecutive interrupts.  So for instance if a 10G NIC is generating an
> interrupt every 100us, about 125,000 bytes needs to queued at each
> interrupt to prevent starvation-- this doesn't translate to a fixed
> number of packets.  Limiting by packets seems somewhat ad hoc; if the
> limit is to small and the link will be starved, too big and
> over-queuing results.

Yes, however when packets are small the limiting factor becomes
per-transfer transaction related overhead.
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