Gordon Bergling wrote:
Can you verify your feelings by numbers?
Yes, like I said
Not by a few % points, but by factors if not an order of magnitude!
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253261 Do this: dd if=/dev/zero of=/dev/nvd2 bs=100M status=progress and you see that it's writing with the "whopping" speed of 70 MB/s. That used to be good, but it is no longer good. Compare Amazon Linux doing the same thing at 300 MB/s. Now, when you put a file system over it, zfs or ufs, then instantly the performance gets better: newfs /dev/nvd2 mount /dev/nvd2 /mnt dd if=/dev/zero of=/mnt/test bs=100M status=progress now that works at about 250 MB/s. Decent. So, problem solved? No! It turns out if I create a PostgreSQL database over this setup, then again there is massive delay on the read and write and throughput will drop to even worse than 70 MB/s. Creating one index takes 10 times as long as that same on the Linux system. PS: no need to point out that Linux uses buffer cache for direct write to device and BSD doesn't. Those effects will not make a difference when you write (or read) more than the buffer cache size (e.g., a few GBs). _______________________________________________ freebsd-performance@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"