questions from FreeBSD user

Sepherosa Ziehau sepherosa at
Sun Jul 15 03:30:37 PDT 2012

On Sun, Jul 15, 2012 at 5:02 PM, Wojciech Puchar
<wojtek at> wrote:
> i have few questions. i am currently using FreeBSD, dragonfly was just
> tried.
> 1) why on amd64 platform swapcache is said to be limited to 512GB? actually
> it may be real limit on larger setup with more than one SSD.
> 2) it is said that you are limited to cache about 400000 inodes unless you
> use sysctl setting vfs.hammer.doublebuffer or so.
> in the same time it is said to be able to cache any filesystem.
> Can UFS be cached efficiently with millions of files?
> 3) how about reboots? From my understanding reboot, even clean, means losing
> ALL cached data. am i right?

As far as I have used swapcache, all cached data are lost after rebooting.

> In spite of HAMMER being far far far better implementation of filesystem
> that ZFS, i don't want to use any of them for the same reasons.
> UFS is safe.

Hmm, hammer is safe too :)

> 4) will virtualbox or qemu-kvm or similar tool be ported ever to DragonFly?

Don't know the state about virtualbox.  However, qemu works.

Best Regards,

> i am not fan of virtualizing everything, which is pure marketing nonsense,
> but i do some virtualize few windows sessions on server.
> thanks

Tomorrow Will Never Die

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