Date: Sun, 31 Aug 2008 10:43:56 +0200 From: Henri Hennebert <hlh@restart.be> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: stable@FreeBSD.org, John Baldwin <jhb@FreeBSD.org> Subject: Re: Possible ZFS patch, please test! Message-ID: <48BA59CC.3020000@restart.be> In-Reply-To: <20080830194419.GA9882@icarus.home.lan> References: <200808281753.06379.jhb@freebsd.org> <48B99F64.1000603@restart.be> <20080830194419.GA9882@icarus.home.lan>
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Jeremy Chadwick wrote: > On Sat, Aug 30, 2008 at 09:28:36PM +0200, Henri Hennebert wrote: >> John Baldwin wrote: >>> This patch merges a few changes from HEAD back to 7.x. I think the >>> endian changes specifically might solve the issue people saw with >>> zpools created with non-dtrace kernels not being readable by dtrace >>> kernels and vice versa. >>> >>> http://www.FreeBSD.org/~jhb/patches/zfs_7.patch >>> >> Just a follow-up >> >> I cvsup at Sat Aug 30 12:55 without zfs_7.patch and >> >> make buildworld && make buildkernel && make installkernel >> >> reboot (-s) --root on zfs is ok -- make installworld >> >> reboot >> >> System is still sluggish even during the make installworld in single user. > > Sorry if I've missed this, but what tuning have you done for ZFS? Some > of us (most of us?) have seen fairly "sluggish" performance when > prefetch is enabled (the default), while the system is generally more > responsive when prefetch is disabled. prefetch is enabled: vfs.zfs.arc_min: 33554432 vfs.zfs.arc_max: 268435456 vfs.zfs.mdcomp_disable: 0 vfs.zfs.prefetch_disable: 0 vfs.zfs.zio.taskq_threads: 0 vfs.zfs.recover: 0 vfs.zfs.vdev.cache.size: 10485760 vfs.zfs.vdev.cache.max: 16384 vfs.zfs.cache_flush_disable: 0 vfs.zfs.zil_disable: 0 vfs.zfs.debug: 0 > > This may have nothing to do with the problem you've stated, but I > thought I'd throw it out there. I think that the problem is somewhere else because >80% of system cpu on a dual core seems awfully bad - eg more than 20 seconds to open this response after clicking on the response button. Henri >
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