Fabian - ZFS Arc

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Hi Allan and Benedict,

I'm considering installing FreeBSD on a laptop with 4 GB of RAM. It would be nice to be able to utilize the features of ZFS, but I'm a bit concerned about the memory usage. How is the memory shared between applications and the ARC? Do I understand it correctly that the ARC won't give up any of its space when other applications need more memory?

I have heard that you can set the max ARC size through a sysctl, but when the ARC is mostly empty, will other applications be able to use the memory if it isn't being utilized by the ARC? Would 512 MB be a sensible size for the ARC considering that it is a laptop? How do you expect the read/write performance to be compared to UFS?

Love the show!

Kind regards,
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