From owner-freebsd-net@FreeBSD.ORG Wed Dec 21 06:46:47 2011 Return-Path: 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 E7214106566B for ; Wed, 21 Dec 2011 06:46:47 +0000 (UTC) (envelope-from jfvogel@gmail.com) Received: from mail-wi0-f182.google.com (mail-wi0-f182.google.com [209.85.212.182]) by mx1.freebsd.org (Postfix) with ESMTP id 7708C8FC16 for ; Wed, 21 Dec 2011 06:46:47 +0000 (UTC) Received: by wibhr1 with SMTP id hr1so3453570wib.13 for ; Tue, 20 Dec 2011 22:46:46 -0800 (PST) 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=WesLcAXDNiWfw4i5vY2Yh1gr856KYrSNBaezcWyDkbc=; b=IgaGUzzs8OiQ/7u5Q4/zHzoED698wAtf1NCaDq23377Ab5vEQqYEQ9RtNNzKzmJGkP eWn2mNp8lu4NVdZiZfhISVugyt9mmWl8/LiUinFnxCXUapPfXS9vwDD2V7nct0qrBZIR eG4+xQiVx4pn6I6nTu6YtrWtWTrIuHv40QTZ4= MIME-Version: 1.0 Received: by 10.180.85.4 with SMTP id d4mr11236914wiz.0.1324450006299; Tue, 20 Dec 2011 22:46:46 -0800 (PST) Received: by 10.180.92.38 with HTTP; Tue, 20 Dec 2011 22:46:46 -0800 (PST) In-Reply-To: <5b246a7cf0bceedf39ff5718336b0753@servedomains.com> References: <2f23773b5165887ac51d19a612bf4c93@servedomains.com> <20111220224814.GA7715@michelle.cdnetworks.com> <5b246a7cf0bceedf39ff5718336b0753@servedomains.com> Date: Tue, 20 Dec 2011 22:46:46 -0800 Message-ID: From: Jack Vogel To: Clint Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-net@freebsd.org Subject: Re: igb performance/load udp issue X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Dec 2011 06:46:48 -0000 I was fighting with UDP issues before the latest checkin, so you should look at THAT version, 2.3.1 in HEAD please. Jack On Tue, Dec 20, 2011 at 5:52 PM, Clint wrote: > On Tue, 20 Dec 2011 14:48:14 -0800, YongHyeon PYUN wrote: > >> I also see similar excessive system load with em(4) on latest HEAD. >> Self-clocking protocols like TCP does not seem to suffer from the >> issue but UDP clearly shows the issue. A single bulk UDP transmit >> test session completely halts the box while the test is in >> progress. I have a patch that addresses it but it needs more clean >> ups and Jack's review. I'm not sure whether the patch could be >> accepted since it completely removes taskqueue based approach in >> TX/RX path. >> Also note, multi-queue option of igb(4) can re-order UDP packets in >> TX path such that it can result in poor NFS over UDP performance. >> It seems TCP is more resilient on packet reodering though. >> >> Because igb(4) shares implementation idea with em(4), it's possible >> igb(4) also have the similar issue. I have to find some spare time >> to try this with igb(4) but I'm somewhat overloaded to address poor >> em(4) performance on 82574 with MSI-X. >> >> > I decided to try the updated igb driver, v2.2.5, in FreeBSD 9.0RC3. I can > no longer duplicate the excessive load issue as it now performs so poorly > that I can't even stream a 38Mbit/s file via either NFS/UDP or Samba/TCP, > so things went from bad to worse. I'm guessing it has something to do with > flow control as that's appears to be different with this driver, back to > v2.2.3 for now. > > Thanks, > Clint > > ______________________________**_________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@**freebsd.org > " >