netdev - [PATCH 1/2] net: at91_ether.c - Allow transmitter interrupt to be handled first in ISR

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Message-ID: <3DBBD805E3BA064A87F551C0E8BD36740289748A@MAILSRV.intcomgrp.com>
Date:	Wed, 13 Jan 2010 12:25:07 -0500
From:	"James Kosin" <JKosin@...comgrp.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	"Linux Netdev List" <netdev@...r.kernel.org>,
	"Eric Dumazet" <eric.dumazet@...il.com>
Subject: [PATCH 1/2] net: at91_ether.c - Allow transmitter interrupt to be handled first in ISR

Ok,

This is an optimization to:

  Allow the transmitter to free the skb before the receiver allocates
many skbs from the system.  This should help with skb reuse and in
multi-core ARM systems allow the next transmitter to be started while we
service the receiver DMA blocks.

  This first patch is only a move of the service of the transmitter
interrupt to be first in the ISR.  This is not expensive; because the
transmitter queue to the MAC is only (1) one deep, and the receiver is
currently (9) nine deep.

James Kosin

Download attachment "ether_patch_1.patch" of type "application/octet-stream" (874 bytes)