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Date:      Tue, 19 Sep 2000 20:29:18 +0200
From:      Tor.Egge@fast.no
To:        root@nihil.plaut.de
Cc:        grog@lemis.com, current@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG
Subject:   Re: Debugging -current SMPNG HANG on heavy disk-io
Message-ID:  <200009191829.UAA68967@midten.fast.no>
In-Reply-To: Your message of "Sun, 17 Sep 2000 16:29:41 %2B0200 (CEST)"
References:  <Pine.BSF.4.21.0009171622240.840-100000@localhost>

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> (kgdb) ps
>   pid    proc    addr    uid  pri ppid  pgrp   flag stat comm         wchan
>    37 c7874a00 c9665000    0  32     6    36  004086  3  tar          piperd c9663f20
>    36 c7874bc0 c960a000    0  32     6    36  004006  3  tar          FFS node c02f4220

This looks like you've hit the limit for the FFS node memory type.

vmstat -m will indicate if this is correct.

If you see somethinig like

  Memory statistics by type                      Type  Kern
      Type  InUse MemUse HighUse  Limit Requests Limit Limit Size(s)
[....]
   FFS node262144 65536K  65536K 65536K  2024460    0     6  256
[....]
Memory Totals:  In Use    Free    Requests
                93897K    608K     9482590

(i.e. MemUse == Limit), then you've hit the limit.  The process
allocating a FFS node normally holds a vnode lock, resulting in 
a cascade of vnode locks and a frozen system.

Increasing the kmem_map size (by setting a loader variable
(kern.vm.kmem.size) or defining VM_KMEM_SIZE and VM_KMEM_SIZE_MAX in
the kernel config file) should help.

- Tor Egge


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