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BSD: FreeBSD, PF, OpenZFS

Submitted by Roy Schestowitz on Tuesday 2nd of February 2021 05:28:04 PM Filed under
BSD
  • Exploring Swap on FreeBSD | Klara Inc.

    On modern Unix-like systems such as FreeBSD, “swapping” refers to the activity of paging out the contents of memory to a disk and then paging it back in on demand. The page-out activity occurs in response to a lack of free memory in the system: the kernel tries to identify pages of memory that probably will not be accessed in the near future, and copies their contents to a disk for safekeeping until they are needed again. When an application attempts to access memory that has been swapped out, it blocks while the kernel fetches that saved memory from the swap disk, and then resumes execution as if nothing had happened.

    All of the above might sound perfectly sensible. After all, disks are typically much larger than RAM, so why not use them to cache infrequently accessed pages of memory? Yet, many experienced system administrators treat swapping as an abnormal activity, a sign of something amiss. This is justifiable: until relatively recently, the disks typically used for swapping had access latencies millions of times higher than RAM.

  • BREAKING pf(4) change: change route-to so it sends packets to IPs instead of interfaces.

    Does your pf configuration have route-to rules? If so, you need to consider the implications of this commit by David Gwynne (dlg@) carefully.

    [...]

    This change is intended to make configuration and maintenance easier, but it runs a high risk of breaking existing configurations. Read on for the rest of David's commit message, with some background.

  • 2021/02/01 - pf routing syntax changes

    Syntax for PF's routing options (route-to, reply-to, dup-to) has changed. If you do not have console access and use these features, review /etc/pf.conf before updating; the previous syntax will be rejected by pfctl(8).

  • OpenZFS 2.0.2 Released With Fixes, Compatibility Against Latest FreeBSD - Phoronix

    OpenZFS 2.0.2 is out today as the latest version of this open-source ZFS file-system implementation currently supported on Linux and FreeBSD systems.

    Since last year's release of the big OpenZFS 2.0, it was followed up by a point release providing early fixes and Linux 5.10 support while now a second point release has arrived.

»

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