Date: Thu, 14 Mar 2013 11:51:40 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Daniel Kalchev <daniel@digsys.bg> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org> Subject: Re: Strange slowdown when cache devices enabled in ZFS Message-ID: <CAOjFWZ718cGJUruysNYr%2BQuqX-RP2%2BdXAVTnMwnqFgz-%2BmkK9w@mail.gmail.com> In-Reply-To: <26456299-66A3-4CCF-9B9A-906D47EFFC93@digsys.bg> References: <CAOjFWZ6Q=Vs3P-kfGysLzSbw4CnfrJkMEka4AqfSrQJFZDP_qw@mail.gmail.com> <26456299-66A3-4CCF-9B9A-906D47EFFC93@digsys.bg>
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I do have the following set in /boot/loader.conf: vfs.zfs.l2arc_write_boost="160000000" # Set the L2ARC warmup writes to 160 MBps vfs.zfs.l2arc_write_max="320000000" # Set the L2ARC writes to 320 MBps Haven't tried setting them any higher than that, though. During the "0 I/O periods", there's no I/O going to the cache devices either, and they're anywhere from 50% full to almost 100% full (as shown in "zpool list -v" and "zpool iostat" output). ARC use is close to max, though. On Thu, Mar 14, 2013 at 11:41 AM, Daniel Kalchev <daniel@digsys.bg> wrote: > Just an idea - have you tried to increase the L2ARC fill rate? That might > move data faster from RAM to L2ARC.. Don't remember the says to offhand. > > Might be dedup kicking in and not able to get "swapped out" fast enough. > > Daniel -- Freddie Cash fjwcash@gmail.com
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