Date: Sat, 23 Jan 2010 11:19:33 -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.2.00.1001231114110.18316@pragry.qngnvk.ybpny> In-Reply-To: <ed91d4a81001222119y3ee56181ofc66813c987620a@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> <alpine.BSF.2.00.1001222123400.3696@pragry.qngnvk.ybpny> <ed91d4a81001222119y3ee56181ofc66813c987620a@mail.gmail.com>
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On Sat, 23 Jan 2010 00:19, fbsdlist@ wrote: > Good to hear that it's usable for you even on a relatively low-memory > system. Now, throw in an SSD for L2ARC, more RAM for ARC (and L2ARC > housekeeping) and then it starts to really shine. > Can not wait until I can get something like this spinning!. I'm looking at around 6 months before this type of configuration will come into effect and be viable. I'm excited!. > As for better than expected performance, in my not-so scientific > benchmarks (copying 10G-large files on 8-disk RAIDZ2 pool until > filesystem is full) ZFS on FreeBSD did beat the hell out of > OpenSolaris on the same hardware. I was really surprised. I'm sure > something needed to be tuned on OpenSolaris, but it was nice to see > FreeBSD performing so well. > > --Artem > These guys really are doing one hell (maybe 2 or 3 ;]) of a job. Couldn't ask for better people to work on this. > > > On Fri, Jan 22, 2010 at 6:39 PM, jhell <jhell@dataix.net> wrote: >> >> 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 >> >> > _______________________________________________ > 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" > -- jhell
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