From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx.cs.uchicago.edu ([128.135.164.214]:57316 "EHLO mx.cs.uchicago.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751633AbdG0VkH (ORCPT ); Thu, 27 Jul 2017 17:40:07 -0400 Received: from localhost (localhost [127.0.0.1]) by mx.cs.uchicago.edu (Postfix) with ESMTP id 619845FFB0 for ; Thu, 27 Jul 2017 16:40:07 -0500 (CDT) Received: from mx.cs.uchicago.edu ([127.0.0.1]) by localhost (mx.cs.uchicago.edu [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 4k9eMe_Q93fE for ; Thu, 27 Jul 2017 16:40:06 -0500 (CDT) Received: from [128.135.11.234] (hester2.cs.uchicago.edu [128.135.11.234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx.cs.uchicago.edu (Postfix) with ESMTPSA id 9004C5FD8E for ; Thu, 27 Jul 2017 16:40:06 -0500 (CDT) Subject: Re: /etc/mtab read ~900 times by rpc.mountd To: linux-nfs@vger.kernel.org References: <8737a9x9ky.fsf@notabene.neil.brown.name> <595F1A3A.7070405@cs.uchicago.edu> <87efto69rs.fsf@notabene.neil.brown.name> <4ec2a8fc-3ca5-d26b-7742-be4e2f749c21@cs.uchicago.edu> <87y3rv4zrb.fsf@notabene.neil.brown.name> <1740081e-6180-1c88-0a0c-8747a92c65a1@cs.uchicago.edu> <87bmoq4h41.fsf@notabene.neil.brown.name> <9e16d6c3-a675-b53e-c6f3-dfa9cdf1d5c9@cs.uchicago.edu> <871spj1pfr.fsf@notabene.neil.brown.name> <03636068-4cc7-896e-5f8b-8c3ebfd2aa94@cs.uchicago.edu> <87h8xywl4t.fsf@notabene.neil.brown.name> From: Phil Kauffman Message-ID: <3fd8c348-13ee-ce90-a1d5-d0c652f66c89@cs.uchicago.edu> Date: Thu, 27 Jul 2017 16:40:06 -0500 MIME-Version: 1.0 In-Reply-To: <87h8xywl4t.fsf@notabene.neil.brown.name> Content-Type: text/plain; charset=utf-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: On 07/26/2017 11:37 PM, NeilBrown wrote: > Weird. I thought so as well. > So it seems like the context is different in some way. It is in the sense that I am now using 1.3.4 and 2.1.1 vanilla on Ubuntu Xenial(provides 1.2.8) without any of debian's patches or niceties. > Your nfs_test_notes.txt doesn't show /etc/export.d getting filled in > ... maybe that it done automatically somehow... I copied the files from the original NFS server into /etc/exports.d as part of the VM snapshot I revert back to. My notes say 'mkdir -p /etc/exports.d', but this step is not necessary. root@nfsserver:~# ls /etc/exports.d/ | wc -l 972 I only added 3 extra files so that 'nfsclient' would be able to mount from the testing server (nfsserver). The ZFS datasets were also precreated: root@nfsserver:~# zfs list | wc -l 6062 > Can you try with unpatches 2.1.1? I assume you mean without any patches. vanilla 2.1.1 > Also maybe provide an strace starting before any attempt to mount > anything, and with an extra option "-s 1000".. This is all that happens *before* trying to mount from the client. root@nfsserver:~# systemctl restart nfs-server; exportfs -f; m=$(pgrep rpc.mountd); strace -s 1000 -ttt -T -p $m 2>&1 | tee strace_rpc.mountd2.txt strace: Process 2517 attached 1501190436.659800 select(1024, [3 4 5 7 8 9 10 11 12 13 14 15 16 17 18], NULL, NULL, NULL Stracing rpc.nfsd: root@nfsserver:~# exportfs -f; strace -s1000 -ttt -T /usr/sbin/rpc.nfsd 0 2>&1| tee strace_nfsd.txt; /usr/sbin/sm-notify http://people.cs.uchicago.edu/~kauffman/nfs-kernel-server/take3/strace_rpc.nfsd.txt When mounting from the client I get a strace that is 1.3G (it seems '-s' was not respected for some reason): http://people.cs.uchicago.edu/~kauffman/nfs-kernel-server/take3/strace_rpc.mountd.txt -- Phil Kauffman Systems Admin Dept. of Computer Science University of Chicago kauffman@cs.uchicago.edu