[Bug 212681] I/O is slow for FreeBSD DOMu on XenServer

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Mon Feb 13 15:58:56 UTC 2017


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212681

--- Comment #57 from rainer at ultra-secure.de ---
Well, I did do dd test, but they only write on a filesystem.

It was (back then) most likely on ZFS, with compression etc. that changed the
results.
Esp. if I just write zeros from /dev/null.

That's why I switched to dc3dd because it does the same thing on Linux and on
FreeBSD and completely eliminates the filesystem (and caching) layer as well as
any other kinds of write-optimization.


I've now created an empty UFS filesystem on my 50G volume and run unixbench on
it.

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