Date: Mon, 06 Sep 2010 16:26:22 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs@freebsd.org, jhell <jhell@DataIX.net> Subject: Re: zfs very poor performance compared to ufs due to lack of cache? Message-ID: <4C84EBFE.7030408@icyb.net.ua> In-Reply-To: <C8FDED84AE204EB3B143C3F8301E58E3@multiplay.co.uk> References: <5DB6E7C798E44D33A05673F4B773405E@multiplay.co.uk><AANLkTi=6bta-Obrh2ejLCHENEbhV5stbMsvfek3Ki4ba@mail.gmail.com><4C825D65.3040004@DataIX.net> <7EA7AD058C0143B2BF2471CC121C1687@multiplay.co.uk> <1F64110BFBD5468B8B26879A9D8C94EF@multiplay.co.uk> <4C84C72A.3020506@icyb.net.ua> <C8FDED84AE204EB3B143C3F8301E58E3@multiplay.co.uk>
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on 06/09/2010 16:23 Steven Hartland said the following: > ----- Original Message ----- From: "Andriy Gapon" <avg@icyb.net.ua> >>> No joy, still drops down to arc_min even with those two patches and changing >>> to vm_paging_needed from the post Artem mentioned: >>> http://lists.freebsd.org/pipermail/freebsd-hackers/2010-August/032731.html >>> >>> So I suspect if I hadn't put in a high arc_min as well it would be back down >>> at silly low levels. >> >> But we don't really know this, do we? >> >> I think that it would be useful for you and perhaps for us, if you'd set up >> monitoring (and graphing) of key memory-related parameters. >> E.g. at least the following sysctls: >> kstat.zfs.misc.arcstats.size >> vm.stats.vm.v_pdwakeups >> vm.stats.vm.v_cache_count >> vm.stats.vm.v_inactive_count >> vm.stats.vm.v_active_count >> vm.stats.vm.v_wire_count >> vm.stats.vm.v_free_count >> >> This would allow to see dynamics of memory consumption and correlation with >> pagedaemon events. > > Now monitoring these each minute to an rrd and text file and updated 8-STABLE > with the following patches: > http://people.freebsd.org/~mm/patches/zfs/v15/stable-8-v15.patch > http://people.freebsd.org/~mm/patches/zfs/zfs_metaslab_v2.patch > http://people.freebsd.org/~mm/patches/zfs/zfs_abe_stat_rrwlock.patch > and then the needfree.patch I already posted. Cool! What about vm_paging_needed() patch? -- Andriy Gapon
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