From owner-freebsd-scsi@freebsd.org Mon Jun 26 15:11:02 2017 Return-Path: Delivered-To: freebsd-scsi@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D5667D89845; Mon, 26 Jun 2017 15:11:02 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: from mail-wm0-x229.google.com (mail-wm0-x229.google.com [IPv6:2a00:1450:400c:c09::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 653417CA2D; Mon, 26 Jun 2017 15:11:02 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: by mail-wm0-x229.google.com with SMTP id b184so435902wme.1; Mon, 26 Jun 2017 08:11:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=2Ivhmt0ZiFxkr4AXYgDELGiGv49zFBsBaKqq+F1OS/g=; b=jjHwTPfeZ7TadFZLAtQiax+48/4+0QTOMje597q/oH2bBVr8dZ9Y1lwvOr+2N1WefQ vKEqxqv+gmT/GDZ8jGOXr+derv5yRRqtHHmqdTVdz0DRLcXLCIiiJixXXdQ3Ex+78gnE XiuvrhyWjURYtpV8HCY0eZarDG53bGiVzELYVZ1DoPB5wkQCxxPKlhnwU07u5LPBUPkA qs13S2pupiYP0dankaTs2KqVLzQgD0RiJLAEcy+zLHQ+s2UCSszwlGla9oFrNKGqOdFj EMvvi1WAYCVje3vx7VoVnk537pwOyOG1j+v2yWS4Ibxo9gH4YauT/6/GcrnpoKVdWnEO peGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=2Ivhmt0ZiFxkr4AXYgDELGiGv49zFBsBaKqq+F1OS/g=; b=t9OZCavu5QPsdclyvK94k/+idtKcJilPvGcxREAIYoErLMmh6lDt3spkoEH3Gbkchk QZBokODijZl9MoOi0sPNrVcQtasWZfsNsQaeCVikpVsYBK6VsaGJXLBIDNm3KvPiTMB+ MfefBCCyolgOC9WTMdwBwD+/X9jps3/B+PBQpAZVvZ5puj2I8bDyzNeRiFX+/0XXk55u 0cMbctWgAIkbIoJF2t0X5PFfgPc+PBvIclZiCQGnGe5DF77Lf5R71XjzYyYUBJbfJEM/ BAXdXM49BXNBVvQwB8eFdcRvgKClnvYz9JqOPXu0Sik6qZvN0vboJPJZw+MLo+ht/M35 nsFw== X-Gm-Message-State: AKS2vOwaAQveGH/nSTTkcTCDGz1EsKk/mUKZuZWfJIufjXi9OrDEroDj Kv/n/IFZWUNQTw== X-Received: by 10.28.130.196 with SMTP id e187mr56813wmd.24.1498489860792; Mon, 26 Jun 2017 08:11:00 -0700 (PDT) Received: from ben.home (LFbn-1-7159-4.w90-116.abo.wanadoo.fr. [90.116.90.4]) by smtp.gmail.com with ESMTPSA id m26sm19542171wrm.4.2017.06.26.08.10.59 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 26 Jun 2017 08:11:00 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: mbuf_jumbo_9k & iSCSI failing From: Ben RUBSON In-Reply-To: <64abec26-e310-d66d-93ae-3536914ddd84@yandex.ru> Date: Mon, 26 Jun 2017 17:10:59 +0200 Cc: Ryan Stone , FreeBSD Net , "freebsd-scsi@freebsd.org" Content-Transfer-Encoding: 7bit Message-Id: <8CBA6288-BEB4-4301-8DAE-058B2348F909@gmail.com> References: <486A6DA0-54C8-40DF-8437-F6E382DA01A8@gmail.com> <6a31ef00-5f7a-d36e-d5e6-0414e8b813c7@selasky.org> <613AFD8E-72B2-4E3F-9C70-1D1E43109B8A@gmail.com> <2c9a9c2652a74d8eb4b34f5a32c7ad5c@AM5PR0502MB2916.eurprd05.prod.outlook.com> <52A2608C-A57E-4E75-A952-F4776BA23CA4@gmail.com> <9B507AA6-40FE-4B8D-853F-2A9422A2DF67@gmail.com> <64abec26-e310-d66d-93ae-3536914ddd84@yandex.ru> To: "Andrey V. Elsukov" X-Mailer: Apple Mail (2.3124) X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Jun 2017 15:11:02 -0000 > On 26 Jun 2017, at 15:13, Andrey V. Elsukov wrote: > > I think it is not mlxen specific problem, we have the same symptoms with > ixgbe(4) driver too. To avoid the problem we have patches that are > disable using of 9k mbufs, and instead only use 4k mbufs. Another workaround is to decrease the MTU until 9K mbufs are not more used. On my systems it gives a 4072 bytes MTU. It solved the issue without having to reboot. Of course it's just a workaround, as decreasing MTU increases overhead...