From owner-freebsd-performance@FreeBSD.ORG Wed Dec 5 17:23:12 2007 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E574B16A417 for ; Wed, 5 Dec 2007 17:23:12 +0000 (UTC) (envelope-from cryx-freebsd@h3q.com) Received: from mail.h3q.com (mail.h3q.com [213.73.89.199]) by mx1.freebsd.org (Postfix) with ESMTP id 5211B13C46B for ; Wed, 5 Dec 2007 17:23:12 +0000 (UTC) (envelope-from cryx-freebsd@h3q.com) Received: (qmail 79945 invoked from network); 5 Dec 2007 17:23:10 -0000 Received: from unknown (HELO goa.cryptophone.de) (smtpsend@62.220.7.20) by mail.h3q.com with AES256-SHA encrypted SMTP; 5 Dec 2007 17:23:10 -0000 Message-ID: <4756DE7E.1000104@h3q.com> Date: Wed, 05 Dec 2007 18:23:10 +0100 From: Philipp Wuensche User-Agent: Thunderbird 2.0.0.9 (Macintosh/20071031) MIME-Version: 1.0 To: Mike Tancsa References: <4755ED57.6030603@h3q.com> <200712051616.lB5GGGvb029587@lava.sentex.ca> In-Reply-To: <200712051616.lB5GGGvb029587@lava.sentex.ca> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-performance@freebsd.org Subject: Re: tuning for high connection rates X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Dec 2007 17:23:13 -0000 Mike Tancsa wrote: > At 07:14 PM 12/4/2007, Philipp Wuensche wrote: > >> The debug output of em0 looks like this: >> >> em0: CTRL = 0x40140248 RCTL = 0x8002 >> em0: Packet buffer = Tx=20k Rx=12k >> em0: Flow control watermarks high = 10240 low = 8740 >> em0: tx_int_delay = 66, tx_abs_int_delay = 66 >> em0: rx_int_delay = 32, rx_abs_int_delay = 66 >> em0: fifo workaround = 0, fifo_reset_count = 0 >> em0: hw tdh = 183, hw tdt = 183 >> em0: hw rdh = 139, hw rdt = 139 >> em0: Num Tx descriptors avail = 223 >> em0: Tx Descriptors not avail1 = 6225 >> em0: Tx Descriptors not avail2 = 3 >> em0: Std mbuf failed = 0 >> em0: Std mbuf cluster failed = 0 >> em0: Driver dropped packets = 0 >> em0: Driver tx dma failure in encap = 0 > > If you do a > sysctl -w dev.em.0.stats=1 > > It will spit the nic stats to syslog. What are the results ? em0: Excessive collisions = 0 em0: Sequence errors = 0 em0: Defer count = 0 em0: Missed Packets = 12876719 em0: Receive No Buffers = 5950326 em0: Receive Length Errors = 0 em0: Receive errors = 0 em0: Crc errors = 0 em0: Alignment errors = 0 em0: Collision/Carrier extension errors = 0 em0: RX overruns = 56256 em0: watchdog timeouts = 0 em0: XON Rcvd = 0 em0: XON Xmtd = 0 em0: XOFF Rcvd = 0 em0: XOFF Xmtd = 0 em0: Good Packets Rcvd = 3384408375 em0: Good Packets Xmtd = 2657550034 em0: TSO Contexts Xmtd = 6925441 em0: TSO Contexts Failed = 0 > Also, > what does ifconfig em0 look like (i.e. what options do you have set, > speed etc) Its on a 100Mbit/s switch, we haven't changed the options: em0: flags=8843 metric 0 mtu 1500 options=19b media: Ethernet autoselect (100baseTX ) greetings, cryx