Date: Wed, 16 Apr 2008 00:29:22 +0200 From: "Daniel Andersson" <engywook@gmail.com> To: freebsd-fs@freebsd.org Subject: Choppy performance. Message-ID: <24adbbc00804151529m2a74085ds468eaac55ba94a32@mail.gmail.com>
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Hey! ZFS seems to be working for me. It hasn't crashed/hung for me yet and I've been running it for about two weeks now. The only issue I have so far is that it seems very choppy. FTP transfers vary from 6 - 70MB/s. If I run rtorrent under high load and use top to monitor it: last pid: 74309; load averages: 0.53, 0.39, 0.35 up 5+05:52:41 00:03:25 41 processes: 2 running, 39 sleeping CPU states: 10.1% user, 0.0% nice, 30.0% system, 1.1% interrupt, 58.8% idle Mem: 1369M Active, 127M Inact, 374M Wired, 97M Cache, 213M Buf, 4692K Free Swap: 1024M Total, 27M Used, 997M Free, 2% Inuse PID USERNAME THR PRI NICE SIZE RES STATE TIME WCPU COMMAND 1215 engy 1 99 0 2085M 139M zfs:(& 49:32 19.53% rtorrent ... rtorrent seems to hang temporarily only when the STATE is zfs:(&. Any ideas why or how I can fix it? Does rtorrent steal the RAM ZFS needs? I've tuned it according to the tuning guide: #sysctl.conf kern.maxvnodes=400000 #loader.conf vm.kmem_size_max="1073741824" vm.kmem_size="1073741824" I just noticed that I didn't set vfs.zfs.prefetch_disable=1. I don't get the deadlocks but could the prefetch_disable fix my problem? I'm currently running a raidz pool with only two disks. Is there some way to turn off the mirroring? I don't really care if the stuff on the disks get corrupted/broken. I would however like to get 1TB instead of 500MB. =P Thanks for porting ZFS! Cheers, Daniel
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