Date: Fri, 22 Jan 2010 08:47:46 -0800 From: Artem Belevich <fbsdlist@src.cx> To: jhell <jhell@dataix.net> Cc: Alexander Leidinger <Alexander@leidinger.net>, freebsd-hackers@freebsd.org Subject: Re: Setting "zfs_arc_max" value in FreeBSD 8. Message-ID: <ed91d4a81001220847v15e26830la2d51479c3d104e1@mail.gmail.com> In-Reply-To: <20100120111433.25801pnmhrxnirok@webmail.leidinger.net> References: <7f14551c1001190119x46c6b04dx2362cd1252f0d81@mail.gmail.com> <hj3v0i$i2p$1@ger.gmane.org> <7f14551c1001190216w49814186n1ada2b721380502b@mail.gmail.com> <4B55C5A6.2020109@DataIX.net> <20100120111433.25801pnmhrxnirok@webmail.leidinger.net>
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>> 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. --Artem On Wed, Jan 20, 2010 at 2:14 AM, Alexander Leidinger <Alexander@leidinger.net> wrote: > Quoting jhell <jhell@DataIX.net> (from Tue, 19 Jan 2010 09:45:58 -0500): > >> On 1/19/2010 5:16 AM, Sherin George wrote: >>> >>> Thanks Ivan :) >>> >>> I found It. add following in /boot/loader.conf >>> >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >>> vfs.zfs.arc_max=3D"10244M" >>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > >> I just thought I would give a shout at this for stable/7 as of last >> week. I am not sure if this is just me but I had tried to adjust >> zfs_arc_max and found out that it was unadjusted to my value after the >> system came back up. >> >> Anyone know if it is adjustable on a system with 1024MB of ram ? Is this >> just being auto calculated by some other value ? > > Can you confirm that you made the modification in /boot/loader.conf, and > that you used the double-quotes around the value as shown above? > > The code in 7-stable regarding this is the same as in 8-stable and > 9-current, so if it is done correctly, it has to change accordingly. > > Bye, > Alexander. > > -- > You ain't learning nothing when you're talking. > > http://www.Leidinger.net =A0 =A0Alexander @ Leidinger.net: PGP ID =3D B00= 63FE7 > http://www.FreeBSD.org =A0 =A0 =A0 netchild @ FreeBSD.org =A0: PGP ID =3D= 72077137 > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " >
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