Date: Fri, 22 Jan 2010 21:39:48 -0500 From: jhell <jhell@DataIX.net> To: Artem Belevich <fbsdlist@src.cx> Cc: Alexander Leidinger <Alexander@leidinger.net>, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Setting "zfs_arc_max" value in FreeBSD 8. Message-ID: <alpine.BSF.2.00.1001222123400.3696@pragry.qngnvk.ybpny> In-Reply-To: <ed91d4a81001220847v15e26830la2d51479c3d104e1@mail.gmail.com> References: <7f14551c1001190119x46c6b04dx2362cd1252f0d81@mail.gmail.com> <hj3v0i$i2p$1@ger.gmane.org> <7f14551c1001190216w49814186n1ada2b721380502b@mail.gmail.com> <4B55C5A6.2020109@DataIX.net> <20100120111433.25801pnmhrxnirok@webmail.leidinger.net> <ed91d4a81001220847v15e26830la2d51479c3d104e1@mail.gmail.com>
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On Fri, 22 Jan 2010 11:47, fbsdlist@ wrote: >>> Anyone know if it is adjustable on a system with 1024MB of ram ? Is this >>> just being auto calculated by some other value ? > > You may want to make sure that vm.kmem_size is set to a value much > larger than vfs.zfs.arc_max. Default value may be too small to allow > such a large ARC. > > On a side note, I'm not sure that ZFS is a good match for system with > only 1G of RAM. By trial and error on my box with 8G or memory I've > figured out that I need to set arc_max ~1G below physical memory size > to avoid lockups under load. YMMV. > ZFS on this box with 1G has been quite enjoyable actually. With the settings I have posted I have not had any lockup on stable/7 and no sudden freezes or waits for transfers. So this entirely thus far has been a godsend. I had even put this thing through some of the tortures that others have posted to the list and not come up with the same results but better. There is obviously a lot of variables in this between hardware and configurations used so the results are minimal in comparison. With ZFS in place on this machine it performs a little bit under specs for the hardware but I wouldn't expect anything less for such a file-system. -- Thoughts & Prayers out to Haiti. jhell
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