Date: Sun, 5 Sep 2010 21:13:16 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "jhell" <jhell@DataIX.net> Cc: freebsd-fs@freebsd.org Subject: Re: zfs very poor performance compared to ufs due to lack of cache? Message-ID: <06B9D23F202D4DB88D69B7C4507986B7@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> <4C83A214.1080204@DataIX.net>
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----- Original Message -----
From: "jhell" <jhell@DataIX.net>
> I am not exactly sure what your source is right now but guessing its at
> least 8.1-RELEASE & hoping its 8.1-STABLE.
>
> Line 3656 & 3657 of arc.c ? what are they ?
>
> Do they look like the following,
> 3656: uint64_t available_memory = ptoa((uintmax_t)cnt.v_free_count
> 3657: + cnt.v_cache_count);
Sorry yes running 8.1-RELEASE with the patches mentioned atm:
3656 of arc.c looks like:
if (arc_size > arc_c_min) {
uint64_t evictable_memory =
arc_mru->arcs_lsize[ARC_BUFC_DATA] +
arc_mru->arcs_lsize[ARC_BUFC_METADATA] +
arc_mfu->arcs_lsize[ARC_BUFC_DATA] +
arc_mfu->arcs_lsize[ARC_BUFC_METADATA];
available_memory += MIN(evictable_memory, arc_size - arc_c_min);
}
earlier at 3614 I have what I think your after which is:
uint64_t available_memory = ptoa((uintmax_t)cnt.v_free_count);
Regards
Steve
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