Re: Kernel swap zone exhausted, what is the max allowed? FBSD 7.2

[Adam Vande More]

On Fri, Feb 25, 2011 at 5:11 PM, Mark Terribile wrote:

> I don't explicitly set kern.maxswzone anywhere and it is at its apparent
> maximum and default of 32M (33554432).
>
> Does anyone know if the maximum can be increased?  (What actually is it
> used for?)  I do use lots of memory-intensive processes, most of them idle
> much of the time.  I see that it's involved with the stuff in the src/sys/vm
> directory.  Would someone give me a quick precis or pointer to what I need
> to study to understand what would happen if I tried to boost this to 64M?
>

Well

vbox% sysctl -ad kern.maxswzone
kern.maxswzone: Maximum memory for swap metadata

man 8 loader gives:
 kern.maxswzone
   Limits the amount of KVM to be used to hold swap meta
   information, which directly governs the maximum amount of
   swap the system can support.  This value is specified in
   bytes of KVA space and defaults to 32MBytes on i386 and
   amd64.  Care should be taken to not reduce this value
such
   that the actual amount of configured swap exceeds 1/2 the
   kernel-supported swap.  The default of 32MB allows the
ker-
   nel to support a maximum of ~7GB of swap.  Only change
this
   parameter if you need to greatly extend the KVM
reservation
   for other resources such as the buffer cache or
   kern.ipc.nmbclusters.  Modifies kernel option
   VM_SWZONE_SIZE_MAX.



-- 
Adam Vande More
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Kernel swap zone exhausted, what is the max allowed? FBSD 7.2

[Mark Terribile]

Hi,

I was recently forced to reboot a 7.2 machine after it had run for several 
months.  (Upgrade is not a possibility right now.)  The (apparently) relevant 
part of /var/log/messages reads

 --
Feb 23 13:10:58 gold kernel: pid 9864 (to), uid 1001: exited on signal 6 (core 
dumped)
Feb 23 17:14:13 gold kernel: pid 10386 (epiphany), uid 0: exited on signal 11 
(core dumped)
Feb 23 17:18:19 gold kernel: pid 10414 (epiphany), uid 0: exited on signal 11 
(core dumped)
Feb 24 14:56:05 gold kernel: swap zone exhausted, increase kern.maxswzone
Feb 24 14:56:36 gold last message repeated 1933 times
Feb 24 14:56:57 gold last message repeated 1635 times
Feb 24 14:56:57 gold kernel: swap zone exhausted, nncrxase kern.ma swzone
Feb 24 14:56:57 gold kernel: swap zone exhausted, increase kern.maxswzone
Feb 24 14:57:28 gold last message repeated 1017 times
Feb 24 14:59:29 gold last message repeated 2159 times
Feb 24 15:14:03 gold syslogd: kernel boot file is /boot/kernel/kernel
 ---

I don't explicitly set kern.maxswzone anywhere and it is at its apparent 
maximum and default of 32M (33554432).

Does anyone know if the maximum can be increased?  (What actually is it used 
for?)  I do use lots of memory-intensive processes, most of them idle much of 
the time.  I see that it's involved with the stuff in the src/sys/vm directory. 
 Would someone give me a quick precis or pointer to what I need to study to 
understand what would happen if I tried to boost this to 64M?

Mark Terribile


  
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