From owner-freebsd-net Fri Oct 18 5:53:17 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 43A3137B401 for ; Fri, 18 Oct 2002 05:53:15 -0700 (PDT) Received: from out001.verizon.net (out001pub.verizon.net [206.46.170.140]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5011C43EB2 for ; Fri, 18 Oct 2002 05:53:14 -0700 (PDT) (envelope-from jimmcgra@bellatlantic.net) Received: from Default ([141.154.237.113]) by out001.verizon.net (InterMail vM.5.01.05.09 201-253-122-126-109-20020611) with ESMTP id <20021018125313.ZIWQ3265.out001.verizon.net@Default>; Fri, 18 Oct 2002 07:53:13 -0500 From: "Jim McGrath" To: "Luigi Rizzo" Cc: "Petri Helenius" , "Lars Eggert" , Subject: RE: ENOBUFS Date: Fri, 18 Oct 2002 08:53:36 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 In-Reply-To: <20021017215543.B76232@carp.icir.org> Importance: Normal X-Authentication-Info: Submitted using SMTP AUTH LOGIN at out001.verizon.net from [141.154.237.113] at Fri, 18 Oct 2002 07:53:13 -0500 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org I have to tread carefully here because I was under NDA at my previous company. My work was with the wx driver, but hardware problems are hardware problems. There are a lot of performance enhancing features in the 82544. You will notice that the em driver does not use them. This may be for a reason :-( Our implementation ran with transmit interrupts disabled, so I can't comment on TIDV and am not allowed to comment on RIDV. The Receive Descriptor Threshold interrupt showed promise under high load (Rx interrupts disabled) but you would need to add a timeout function, 1 msec. or faster, to process receive descriptors under low load. Jim > -----Original Message----- > From: owner-freebsd-net@FreeBSD.ORG > [mailto:owner-freebsd-net@FreeBSD.ORG]On Behalf Of Luigi Rizzo > Sent: Friday, October 18, 2002 12:56 AM > To: Jim McGrath > Cc: Petri Helenius; Lars Eggert; freebsd-net@FreeBSD.ORG > Subject: Re: ENOBUFS > > > On Fri, Oct 18, 2002 at 12:49:04AM -0400, Jim McGrath wrote: > > Careful here. Read the errata sheet!! I do not believe the em > driver uses > > these parameters, and possibly for a good reason. > > as if i had access to the data sheets :) > > cheers > luigi > > Jim > > > > > -----Original Message----- > > > From: owner-freebsd-net@FreeBSD.ORG > > > [mailto:owner-freebsd-net@FreeBSD.ORG]On Behalf Of Luigi Rizzo > > > Sent: Thursday, October 17, 2002 11:12 PM > > > To: Petri Helenius > > > Cc: Lars Eggert; freebsd-net@FreeBSD.ORG > > > Subject: Re: ENOBUFS > > > > > > > > > On Thu, Oct 17, 2002 at 11:55:24PM +0300, Petri Helenius wrote: > > > ... > > > > I seem to get about 5-6 packets on an interrupt. Is this tunable? At > > > > > > just reading the source code, yes, it appears that the card has > > > support for delayed rx/tx interrupts -- see RIDV and TIDV definitions > > > and usage in sys/dev/em/* . I don't know in what units are the values > > > (28 and 128, respectively), but it does appear that tx interrupts are > > > delayed a bit more than rx interrupts. > > > > > > They are not user-configurable at the moment though, you need > to rebuild > > > the kernel. > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message