Date: Sun, 23 Oct 2011 18:46:13 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: fs@freebsd.org Subject: ZFS SSD Sample performance observation Message-ID: <4EA444D5.7030400@digiware.nl>
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Hi, I running a full ZFS server, aka the boot partition is also zfs. And I've been playing today with a SSD i just got: ad12: 57241MB <Corsair Force GT 1.2> at ata6-master UDMA100 SATA 3Gb/s Which supposedly can do > 500 Mb on read and write. So just for sake of it I tested compiling buildworlds (-j 64). I know it is not the best test, but it is easy to get at. And I also know that there are a lot of variable to be tweaked, which is not the purpose of the message either. /usr/src is on /zfsboot (mirror) /usr/obj is on /zfsraid (raidz2) Which are both seperate sets of disks. buildtime for buildworld 0:18:25 , no zfs cache, no zfs log. creating on the SSD: 10G cache for /zfsboot 1G log for /zfsraid 40G cache for /zfsraid and things speed up to 0:16:05. (both times on a freshly booted box) So that is almost a 0:02:20 speedup, aka 13% speedup. At the cost of about 70 euros. That is enjoyable. --WjW PS: for those interested, dmesg at: http://www.tegenbosch28.nl/data/FreeBSD/ZFS.dmesg.txt PS2: I remember that 20min was the buildKERNEL time. :)
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