From owner-freebsd-net@FreeBSD.ORG Fri Dec 21 14:47:03 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 9DAA8E5 for ; Fri, 21 Dec 2012 14:47:03 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-we0-f176.google.com (mail-we0-f176.google.com [74.125.82.176]) by mx1.freebsd.org (Postfix) with ESMTP id 2672C8FC14 for ; Fri, 21 Dec 2012 14:47:02 +0000 (UTC) Received: by mail-we0-f176.google.com with SMTP id r5so2127306wey.21 for ; Fri, 21 Dec 2012 06:47:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=S6Y6l+tpFLHAJRuAX55E5gKk317EnzIfi/hkdVnpp8c=; b=JnN88oAy574eNQkwA3KLghzWj135KkpQAvu8WlfxAv4uHG/Kb8K8Kb2KEcqyzWOASX BOPh/tx7ccMoLpejGzgRJBnwTKEBY3fi0Uni3bSyOw8BMMCWSI46XBPDkgSIoDe3HLfV VYKYdYpWa5u5ZD0d2J/sG08x7RlWYjLhphJzSlFGRjI9lRfzjD8fW/cy8eu8y+63kvTR JUXgrNiFUTBLLGiNZsRdtE2utmQ1ChreE76lReqy5QIl3P9PyeBK5bvpmnQvu2dxd6YF IkIoQSV6nmShmkQLzD6o1ba6Rl4SRDOFTIeRFpYKrRnBQcaZYH4nDQ1XFT3bEMKF+wdI E7AA== MIME-Version: 1.0 Received: by 10.180.72.146 with SMTP id d18mr15940506wiv.33.1356101221912; Fri, 21 Dec 2012 06:47:01 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.217.57.9 with HTTP; Fri, 21 Dec 2012 06:47:01 -0800 (PST) In-Reply-To: <50D45282.5080708@extrim.it> References: <50D45282.5080708@extrim.it> Date: Fri, 21 Dec 2012 06:47:01 -0800 X-Google-Sender-Auth: zxQJc2Lgt3-AyLt6CLtb1VlCsS0 Message-ID: Subject: Re: 'no buffer space available' after switch goes down on freeBSD 7.3 From: Adrian Chadd To: Tsaregorodtsev Denis Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-net@freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Dec 2012 14:47:03 -0000 On 21 December 2012 04:13, Tsaregorodtsev Denis wrote: > Hello, > > I maintenance ISP's DNS server which works under FreeBSD 7.3 and BIND > 9.9.1-P4. The network adapter is Intel(R) PRO/1000 Network Connection, > driver - em. The server is connected to a Cisco 6500 switch. Sometimes the > switch goes down (for maintenance) and is unavailable for 10 minutes. After > the switch goes up the server is still unavailable through IP. When I open > an IPMI console on the server and enter the ping command, I receive "no > buffer space available" error message. And the network doesn't work until > the server reboot. > I tried to google this and found that the problem can be solved by > increasing nmbclusters parameter. But I want to understand why this problem > appears when the switch is rebooting . May be you can suggest something? > > Best regards, Tsaregorodtsev Denis Hi, It's quite likely because the mbufs have been allocated and sitting on some queue somewhere, but they're stuck and unable to transmit. Just try 'ifconfig em0 down; ifconfig em0 up' and see if that unwedges things? Adrian