From owner-freebsd-net@FreeBSD.ORG  Sun Oct 30 14:33:32 2011
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1AC7D106566B
	for <freebsd-net@freebsd.org>; Sun, 30 Oct 2011 14:33:32 +0000 (UTC)
	(envelope-from rysto32@gmail.com)
Received: from mail-wy0-f182.google.com (mail-wy0-f182.google.com
	[74.125.82.182])
	by mx1.freebsd.org (Postfix) with ESMTP id 9D3F08FC15
	for <freebsd-net@freebsd.org>; Sun, 30 Oct 2011 14:33:31 +0000 (UTC)
Received: by wyh11 with SMTP id 11so1065334wyh.13
	for <freebsd-net@freebsd.org>; Sun, 30 Oct 2011 07:33:30 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=mime-version:in-reply-to:references:date:message-id:subject:from:to
	:cc:content-type;
	bh=ftQy1WuwRrQXsrhk//yCMoL0J0+bQMD/kS8WunBOvr8=;
	b=INjuGD5EPo+ACOPEq8mKcHbcnVnrpVVFqVPWC5sE5Encm2hRo1v9m87eTATzgoTp1y
	9LIF1igHEVqIf+Etq6OxJMr4qaYzLJ4txNR7BKsTP1lLucSYOE2iACdTv2iDQB2IZRAu
	x/Dha8cUeQAaTxKE02I8y+WpGJKMsHPeFq20A=
MIME-Version: 1.0
Received: by 10.227.60.3 with SMTP id n3mr13357029wbh.25.1319985210494; Sun,
	30 Oct 2011 07:33:30 -0700 (PDT)
Received: by 10.180.8.34 with HTTP; Sun, 30 Oct 2011 07:33:30 -0700 (PDT)
In-Reply-To: <4EAD116A.8090006@gmail.com>
References: <CAAAm0r0RXEJo4UiKS=Ui0e5OQTg6sg-xcYf3mYB5+vk8i8557w@mail.gmail.com>
	<4E8F157A.40702@sentex.net>
	<CAAAm0r2JH43Rct7UxQK2duH1p43Nepnj5mpb6bXo==DPayhJLg@mail.gmail.com>
	<4E8F51D4.1060509@sentex.net>
	<CACqU3MVwLaepFymZJkaVk6p=SpykGhqs=VYFjLh9fP9S=AxDhg@mail.gmail.com>
	<CAAAm0r1DKvoL9=Ket9up=4+5xiCzTTZJK99FhF9jcCA28B0M+A@mail.gmail.com>
	<CAAAm0r3XdsMHZh+P_NF-txZasdExzwZ8ymmGQgGhJQds0fOiBQ@mail.gmail.com>
	<CAAAm0r1iS3z-7CBJ=xYDf+JOA1Q2nU0O54Twbyb7FjvgWHjKVw@mail.gmail.com>
	<4EA7E203.3020306@sepehrs.com>
	<CAAAm0r3Nr2t8cCetPkFnLQ-3KwqHw_0SpqbtvYPRUkSP=9n8CA@mail.gmail.com>
	<4EA80818.3030504@sentex.net> <4EA80F88.4000400@hotplug.ru>
	<4EA82715.2000404@gmail.com> <4EA8FA40.7010504@hotplug.ru>
	<4EA91836.2040508@gmail.com> <4EA959EE.2070806@hotplug.ru>
	<4EAD116A.8090006@gmail.com>
Date: Sun, 30 Oct 2011 10:33:30 -0400
Message-ID: <CAFMmRNxPGJ+DQ2giaFbofAmC6progTmW7haKmRCKV3NsniRsNQ@mail.gmail.com>
From: Ryan Stone <rysto32@gmail.com>
To: Hooman Fazaeli <hoomanfazaeli@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: pyunyh@gmail.com, freebsd-net@freebsd.org,
	Jason Wolfe <nitroboost@gmail.com>,
	Jack Vogel <jfvogel@gmail.com>, Emil Muratov <gpm@hotplug.ru>
Subject: Re: Intel 82574L interface wedging on em 7.1.9/7.2.3 when MSIX
	enabled
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 30 Oct 2011 14:33:32 -0000

On Sun, Oct 30, 2011 at 4:57 AM, Hooman Fazaeli <hoomanfazaeli@gmail.com> wrote:
> IMHO, this is not a driver issue and the real fix would be to change
> IFQ_HANDOFF to call if_start when the queue is full.

I'm not sure that's the right approach.  99% of the time, calling
if_start when the queue is full will be a waste of time. It seems to
me that the link interrupt handler needs to kick off the tx task to
drain the tx queue instead.