FreeBSD 6 vs 8.1

[Mats Lindberg]

Hi again, just spotted the limit
>>> swapsize     unlimited

I'll try to reset it and see what happens...

2011/3/14 Mark Tinguely <marktinguely at gmail.com>

>
> You are running out of physical memory, there is no swap backstore and the
> kernel is killing off other programs to claim memory.
>
> Compare the /etc/login.conf on both systems. I bet in the FreeBSD 6.3
> system, the memory limit is set  to a limit (8M) and on the FreeBSD 8.1 it
> is much higher or is "unlimited". With a set memory limit, the "dd" is
> killed before the kernel starts killing off the other program.
>
>
> On 3/14/2011 6:41 AM, Mats Lindberg wrote:
>
> No - not from what I understand
> in the vmware it looks like a real disk device /dev/ad0s1e
> in the nfsroot'ed system I actually have 'of=/opt/something' which is
> definately to the nfs disk.
>
>
>  2011/3/14 Mark Tinguely <marktinguely at gmail.com>
>
>>  On 3/14/2011 6:17 AM, Mats Lindberg wrote:
>>
>>>  All
>>> I am migrating from FreeBSD 6.3 to FreeBSD 8.1 And I have noticed some,
>>> what
>>> I think is, strange behaviour.
>>>
>>> In FreeBSD 6.3 when I do
>>>
>>>> swapoff -a
>>>> dd if=/dev/zero of=/tmp/whatever bs=1G count=1
>>>>
>>> I get something like "out of memory - killed"
>>>
>>> In FreeBSD 8.1 doing the same - processes around start to die, e.g. all
>>> getty's are killed and finally devfs goes the same way.
>>>
>>> My target is diskless nfs mounted to a linux fileserver - hence no swap
>>> partition
>>> It does not seem to be relalted to the nfs root however - I get the same
>>> behaviour running FBSD-8.1 in a VMWARE server session.
>>>
>>> Is this a new 'feature' of FBSD or just a bug?
>>> Are there some sysctl's to set to 'really' turn of swapping.
>>>
>>> At one instance I also got a kernel panic saying 'page fault in kernel'
>>> but
>>> I'm having a hard time to repeat just that.
>>>
>>> regards
>>> Mats
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>>>
>>>  Do you have /tmp mounted on a memory filesystem?
>>
>> --Mark Tinguely
>>
>>
>
>