tmpfs panic

[Dmitry Morozovsky]

On Sun, 15 Jun 2008, Kostik Belousov wrote:

KB> On Sun, Jun 15, 2008 at 01:06:24PM +0400, Dmitry Morozovsky wrote:
KB> > Hi there,
KB> > 
KB> > at contemporary RELENG_7/amd64

[snip]


KB> I suspect this may be my mistake.
KB> IN case you can reproduce it, please, try the patch below.

Will try, thank you. 

KB> > Also, active tmpfs usage easy leads to "swap zone exhausted, increase
KB> > kern.maxswzone", even with 2G RAM + 4G swap and approx 2-3G of tmpfs
KB> > in use -- any hints?
KB> 
KB> I think the message is pretty much self-explanatory. Kernel tried to
KB> allocate the meatadata to track the swap metadata, and zone appears
KB> exhausted. It is not the swap space shortage. Instead, this is kernel
KB> zone used to track swap allocation shortage.
KB> 
KB> It is quite non-obvious how to automatically tune this limit, since zone
KB> is allocated before swap is configured.

Well, but loader(8) man page said:
  The default of 32MB allows the kernel to support a maximum of ~7GB of swap. 

and I have only 4G, and system freezes with maxswzone exaustion well before 
that...

Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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