From: Neil Brown <neilb@cse.unsw.edu.au>
Subject: Re: Debian Bug#235886: nfs-kernel-server inducing load of 8-9 with no good reason for Linux 2.6 clients
Date: Mon, 22 Mar 2004 11:25:11 +1100
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <16478.12903.581002.87570@notabene.cse.unsw.edu.au>
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To: Chip Salzenberg <chip@pobox.com>
In-Reply-To: message from Chip Salzenberg on Thursday March 18
Errors-To: nfs-admin@lists.sourceforge.net

On Thursday March 18, chip@pobox.com wrote:
> 
> Neil (or someone), what should I tell this user?
> 

"use tcp" might be a good answer.... especially if it works :-)

NeilBrown

> 
> ----- Forwarded message from "Steinar H. Gunderson" <sgunderson@bigfoot.com> -----
> 
> Subject: Bug#235886: nfs-kernel-server inducing load of 8-9 with no good reason for Linux 2.6 clients
> From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
> To: Debian Bug Tracking System <submit@bugs.debian.org>
> Date: Wed, 03 Mar 2004 00:41:21 +0100
> X-Mailer: reportbug 1.50
> 
> Package: nfs-kernel-server
> Version: 1:1.0-2woody1
> Severity: important
> 
> It appears that from time to time, our NFS servers (both 2.4 and 2.6
> servers, but both running woody) seem to go into giant loads with almost
> no traffic (ie. 20-30 connections, but almost no file activity, as
> confirmed by tcpdump). This is typically in the 7-8-9 range, and the
> clients in question seem to hang almost indefinitely (like 20 minutes
> for a simple ls). However, top shows no processes wanting CPU time, so
> it almost looks like some kind of I/O starvation problem.
> 
> In addition, we seem to get strange errors like:
> 
>   00:16:32.330039 129.241.93.186 > 129.241.93.30: icmp: ip reassembly time exceeded [tos 0xc0] 
> 
> (.30 is the NFS server, .186 is one of the NFS clients)
>   
> Something is clearly wrong here; stopping nfs-kernel-server makes the
> load drop to zero almost immediately, and substituting nfs-user-server for
> nfs-kernel-server also fixes the problem. The servers in question are
> also NFS clients, but there are no stale mounts and we aren't using NFS
> re-export.
> 
> These problems seem to coincide with the rollout of Linux 2.6.x (seen
> the problem with both 2.6.1 and 2.6.3) on the clients, so it seems
> plausible that something in the Linux 2.6 client is triggering the NFS
> kernel server code. I'm a bit unsure if I should file this on
> nfs-kernel-server or on a kernel package; feel free to reassign as
> needed.
> 
> -- System Information
> Debian Release: 3.0
> Architecture: i386
> Kernel: Linux cassarossa 2.4.25 #1 SMP Wed Feb 18 22:46:21 CET 2004 i686
> Locale: LANG=en_US, LC_CTYPE=en_US.ISO8859-1
> 
> Versions of packages nfs-kernel-server depends on:
> ii  debconf                    1.2.35        Debian configuration management sy
> ii  libc6                      2.2.5-11.5    GNU C Library: Shared libraries an
> ii  libwrap0                   7.6-9         Wietse Venema's TCP wrappers libra
> ii  nfs-common                 1:1.0-2woody1 NFS support files common to client
> 
> ----- End forwarded message -----
> 
> -- 
> Chip Salzenberg               - a.k.a. -               <chip@pobox.com>
> "I wanted to play hopscotch with the impenetrable mystery of existence,
>     but he stepped in a wormhole and had to go in early."  // MST3K
> 
> 
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