Date: Thu, 13 Sep 2007 22:25:32 +0100 From: "Joao Barros" <joao.barros@gmail.com> To: "Pawel Jakub Dawidek" <pjd@freebsd.org> Cc: current@freebsd.org Subject: Re: ZFS not caching right? Message-ID: <70e8236f0709131425h2f651c32j5e23d7901ce6e1f7@mail.gmail.com> In-Reply-To: <20070910195833.GE1103@garage.freebsd.pl> References: <20070906184853.GB90021@roadrunner.spoerlein.net> <20070910195833.GE1103@garage.freebsd.pl>
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On 9/10/07, Pawel Jakub Dawidek <pjd@freebsd.org> wrote: > On Thu, Sep 06, 2007 at 08:48:53PM +0200, Ulrich Spoerlein wrote: > > Hi, it's me again with another stupid question, > > > > ever since I switched my /usr and /home to ZFS, the system has become > > _very_ unresponsive under load. This is not because of CPU load, but I/O > > load. > > Can you try recent HEAD? I committed a change that allows ZFS cache > (ARC) to use more memory. This should be safe after dfr@'s vnode leak > fix and should also help performance. > > -- > Pawel Jakub Dawidek http://www.wheel.pl > pjd@FreeBSD.org http://www.FreeBSD.org > FreeBSD committer Am I Evil? Yes, I Am! > > This happened 1 day after compiling new sources: panic: kmem_malloc(90112): kmem_map too small: 329805824 total allocated when writing through NFS. On FreeBSD xeon.bsdtech.org 7.0-CURRENT FreeBSD 7.0-CURRENT #8: Tue Sep 11 00:08:39 WEST 2007 root@xeon.bsdtech.org:/usr/obj/usr/src/sys/GENERIC i386 Machine has 1GB of ram and: vfs.zfs.arc_min: 16777216 vfs.zfs.arc_max: 251658240 vfs.zfs.mdcomp_disable: 0 vfs.zfs.prefetch_disable: 1 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 I hadn't had any panics with sources from August 16 but before your recent changes vfs.zfs.arc_max was 167772160 kern.maxvnodes is not set to 50000 as recomended ( on purpose ) and is currently at 52242 set by the system. Is 50000 still recomended after your changes? -- Joao Barros
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