FreeBSD and Linux SSD Write Speeds

Jov amutu at
Wed Jun 21 16:23:30 UTC 2017

Try add sync option to dd and write twice of memory size data(16gb for your


2017年6月22日 12:04 AM,"Tim Daneliuk" <tundra at>写道:

Disclaimer: Tests below run on lightly loaded systems, but results are ...

Test Case: dd if=/dev/zero of=foo bs=8M count=512

Linux 4.4.0-21-generic on a 2.66GHz Core2 Duo w/8GB memory, older OCZ
SSD/ext4:  310MB/sec writes

FreeBSD 10-STABLE on an 3.2 GHz Quad Core i5 w/8GB memory, newer Kingston
SSD/ufs:  210MB/sec writes

Results are repeatable.

So, what is the likely culprit making FreeBSD 1/3 slower?  The FreeBSD
system does does / nfs exported (which I don't quite yet understand since
all the nfs mount points are below it) at the moment, but there is little
or no nfs traffic.

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