From owner-freebsd-stable@FreeBSD.ORG Thu Jul 1 19:23:59 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 87A86106566B for ; Thu, 1 Jul 2010 19:23:59 +0000 (UTC) (envelope-from yanefbsd@gmail.com) Received: from mail-gw0-f54.google.com (mail-gw0-f54.google.com [74.125.83.54]) by mx1.freebsd.org (Postfix) with ESMTP id 37A328FC15 for ; Thu, 1 Jul 2010 19:23:58 +0000 (UTC) Received: by gwb1 with SMTP id 1so652137gwb.13 for ; Thu, 01 Jul 2010 12:23:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=Vza7lFsk4MwTgwwrMrZEs1G7rfl5T5Q0fTgzK+cx5xI=; b=fQir3/tB9iLFYhbBMDn3ud40rDj3H6LLI/qX3Y+ti3E9fxuL1KqJ40Gs0RGPA3APPo b0LzMUQm3KYBe0Hhza+KWk7bI6sYkX+Ndh/SF8fDdnrKW+KpjpHKltzNuEbsDjBpcHBX g/uzf/uaKQcwRIe8h9qhbalWTbmyR2mHJ75Nc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=dFvLN8r8vyl0fS2yQg9nUf2GAq7dRMn+wpNcDzXv8MlEGevC69z2fcxKVLAoxmwM+U osMmH/WIeMSJzdGUwvzEZ+6mzD0bXlrxHYAiqhojZ6dfdJCrEm5j16VBMZskWl71brxV GfDV3TWJlrhVSKTBCWZTw19vNOjjZ00RMfzGw= MIME-Version: 1.0 Received: by 10.229.235.197 with SMTP id kh5mr6645721qcb.237.1278012229927; Thu, 01 Jul 2010 12:23:49 -0700 (PDT) Received: by 10.229.221.83 with HTTP; Thu, 1 Jul 2010 12:23:49 -0700 (PDT) In-Reply-To: <538823.39365.qm@web50508.mail.re2.yahoo.com> References: <538823.39365.qm@web50508.mail.re2.yahoo.com> Date: Thu, 1 Jul 2010 12:23:49 -0700 Message-ID: From: Garrett Cooper To: alan bryan Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-stable@freebsd.org Subject: Re: NFS 75 second stall X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Jul 2010 19:23:59 -0000 On Thu, Jul 1, 2010 at 11:51 AM, alan bryan wrote: > > > --- On Thu, 7/1/10, Garrett Cooper wrote: > >> From: Garrett Cooper >> Subject: Re: NFS 75 second stall >> To: "alan bryan" >> Cc: freebsd-stable@freebsd.org >> Date: Thursday, July 1, 2010, 11:13 AM >> On Thu, Jul 1, 2010 at 11:01 AM, alan >> bryan >> wrote: >> > Setup: >> > >> > server - FreeBSD 8-stable from today.=A0 2 UFS dirs >> exported via NFS. >> > client - FreeBSD 8.0-Release. =A0Running a test php >> script that copies around various files to/from 2 separate >> NFS mounts. >> > >> > Situation: >> > >> > script is started (forked to do 20 simultaneous runs) >> and 20 1GB files are copied to the NFS dir which works >> fine.=A0 When it then switches to reading those files back >> and simultaneously writing to the other NFS mount I see a >> hang of 75 seconds.=A0 If I do an "ls -l" on the NFS mount it >> hangs too.=A0 After 75 seconds the client has reported: >> > >> > nfs server 192.168.10.133:/usr/local/export1: not >> responding >> > nfs server 192.168.10.133:/usr/local/export1: is alive >> again >> > nfs server 192.168.10.133:/usr/local/export1: not >> responding >> > nfs server 192.168.10.133:/usr/local/export1: is alive >> again >> > >> > and then things start working again.=A0 The server was >> originally FreeBSD 8.0-Release also but was upgraded to the >> latest stable to see if this issue could be avoided. >> > >> > # nfsstat -s -W -w 1 >> > =A0GtAttr Lookup Rdlink=A0=A0=A0Read=A0 Write Rename >> Access=A0 Rddir >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 222=A0 =A0 257 >> =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 178=A0 =A0 135 >> =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0=A0=A085=A0 =A0 127 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > >> > ... for 75 rows of all zeros >> > >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 272=A0 =A0 266 >> =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > =A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0=A0 =A0 167=A0 =A0 165 >> =A0 0=A0 =A0 =A0 0=A0 =A0 =A0 0 >> > >> > I also tried runs with 15 simultaneous processes and >> 25. =A015 processes gave only about a 5 second stall but 25 >> gave again the same 75 second stall. >> > >> > Further, I tested with 2 mounts to the same server but >> from ZFS filesytems with the exact same stall/timeout >> periods. =A0So, it doesn't appear to matter what the >> underlying filesystem is - it's something in NFS or >> networking code. >> > >> > Any ideas on what's going on here? =A0What's causing >> the complete stall period of zero NFS activity? =A0 Any flaws >> with my testing methods? >> > >> > Thanks for any and all help/ideas. >> >> What network driver are you using? Have you tried >> tcpdumping the packets? >> -Garrett >> > > I'm using igb currently but have also used em. =A0I have not tried tcpdum= ping the packets yet on this test. =A0Any suggestions on things to look out= for (I'm not that familiar with that whole process). > > Which brings up another point - I'm using TCP connections for NFS, not UD= P. Is the net.inet.tcp.tso sysctl enabled or not? What about rxcsum and tx= csum? Thanks, -Garrett