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From: Anonymous <swell.k@gmail.com>
To: David Samms <dsamms@nw-ds.com>
References: <4D1BCE34.4090601@nw-ds.com>
	<20101230085723.GA38391@tolstoy.tols.org>
	<ifidg5$qeq$1@dough.gmane.org> <ifjgsu$s33$1@dough.gmane.org>
Date: Fri, 31 Dec 2010 18:14:56 +0300
In-Reply-To: <ifjgsu$s33$1@dough.gmane.org> (David Samms's message of "Thu, 30
	Dec 2010 19:58:37 -0700")
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Cc: freebsd-fs@freebsd.org
Subject: Re: 8.2-RC1 and ZFS
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David Samms <dsamms@nw-ds.com> writes:

[...]
> The same test with ZFSv28 and ZFSv28 + tuning
>
> ZFSv28
> ----------------------------------------------------------------------
> dd if=/dev/zero of=big bs=1m count=6400
> 6710886400 bytes transferred in 158.205268 secs (42418855 bytes/sec)
>
> OpenOffice 197sec
> MP3 skips
> XFCE4 popup menus took 5-15 seconds to appear
>
>
> ZFSv28 + tuning
> --vfs.zfs.txg.timeout="5"

the tunable defaults to "5" in v28, see txg.c

  int zfs_txg_timeout = 5;        /* max seconds worth of delta per txg */

> --vfs.zfs.txg.write_limit_override=268435456

No such tunable/sysctl. It was renamed to vfs.zfs.write_limit_override
in v28 (note ".txg." absence).

> --kern.maxvnodes=250000

> ----------------------------------------------------------------------
> dd if=/dev/zero of=big bs=1m count=6400
> 6710886400 bytes transferred in 167.316444 secs (40108947 bytes/sec)
>
> OpenOffice 190sec
> No MP3 skips during "dd", but one skip while OpenOffice was starting
> XFCE4 popup menus took 2-13 seconds to appear