Date: Tue, 4 Nov 2014 08:48:14 -0800 From: George Kola <georgekola@gmail.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-stable@freebsd.org Subject: Re: ARC size limit Message-ID: <F6BFA688-9D13-4DD9-8B8A-22F4ACFD7622@gmail.com> In-Reply-To: <54589722.3080803@multiplay.co.uk> References: <3B70EA0C-0976-49D6-8418-6B5D22ED7E65@gmail.com> <54589722.3080803@multiplay.co.uk>
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Thanks Steven. We are running 10.1rc3. Is the best way to get this patch = to just compile 10-stable kernel ? We are new to running FreeBSD and = hence the newbie question. Thanks, George > On Nov 4, 2014, at 1:06 AM, Steven Hartland <killing@multiplay.co.uk> = wrote: >=20 > You need https://svnweb.freebsd.org/base?view=3Drevision&revision=3D2728= 75 > On 04/11/2014 06:29, George Kola wrote: >> Hi All, >> This is my first post to freebsd-stable fresh of Meet BSD = California 2014. We are switching our entire production to FreeBSD. Our = storage servers have 256 GB of RAM , 4 TB of SSD and 40 TB of spinning = disks. We are running ZFS root and the SSD is configured as L2ARC. We = are running FreeBSD 10.1 RC3 >> I am finding that on all our machines, ARC is somehow limited = to < 64 GB of memory and we have a huge inactive memory (180 G). The = surprising thing is that ARC seems to have almost the same limit (< 64 = GB) on all of our storage boxes and ARC is not growing even though L2ARC = hit shows that there is advantage in growing ARC. >> Any help/pointers is appreciated. >> What I am trying to do is to tune ZFS for our workload. We are = hoping that we get a high hit rate. >> Thanks to Justin Gibbs and Allan Jude for initial pointers and = help. They suggested posting to the mailing list to get further help. >>=20 >> I have pasted top output and zfs-stats output below and yes = UMA is enabled. >>=20 >> Thanks, >> George >> =20 >>=20 >> top >> last pid: 27458; load averages: 3.30, 5.42, 5.34 = = up 6+09:59:30 05:38:49 >> 71 processes: 1 running, 70 sleeping >> CPU: 4.2% user, 0.0% nice, 4.6% system, 0.2% interrupt, 90.9% = idle >> Mem: 11G Active, 181G Inact, 52G Wired, 1368M Cache, 4266M Free >> ARC: 47G Total, 1555M MFU, 41G MRU, 35M Anon, 3984M Header, 709M = Other >> Swap: 64G Total, 2874M Used, 61G Free, 4% Inuse >>=20 >>=20 >>=20 >> sysctl vfs.zfs.zio.use_uma >> vfs.zfs.zio.use_uma: 1 >>=20 >>=20 >>=20 >>=20 >> zfs-mon -a output >>=20 >> ZFS real-time cache activity monitor >> Seconds elapsed: 62 >>=20 >> Cache hits and misses: >> 1s 10s 60s tot >> ARC hits: 124 126 103 101 >> ARC misses: 35 46 29 28 >> ARC demand data hits: 55 90 61 61 >> ARC demand data misses: 20 32 18 17 >> ARC demand metadata hits: 69 36 42 40 >> ARC demand metadata misses: 9 13 10 9 >> ARC prefetch data hits: 0 0 0 0 >> ARC prefetch data misses: 6 1 1 1 >> ARC prefetch metadata hits: 0 0 0 0 >> ARC prefetch metadata misses: 0 0 0 0 >> L2ARC hits: 16 28 14 14 >> L2ARC misses: 19 18 15 14 >> ZFETCH hits: 592 2842 2098 2047 >> ZFETCH misses: 308 1326 507 494 >>=20 >> Cache efficiency percentage: >> 10s 60s tot >> ARC: 73.26 78.03 78.29 >> ARC demand data: 73.77 77.22 78.21 >> ARC demand metadata: 73.47 80.77 81.63 >> ARC prefetch data: 0.00 0.00 0.00 >> ARC prefetch metadata: 0.00 0.00 0.00 >> L2ARC: 60.87 48.28 50.00 >> ZFETCH: 68.19 80.54 80.56 >>=20 >>=20 >>=20 >>=20 >> zfs-stats -a output >>=20 >> ZFS real-time cache activity monitor >> Seconds elapsed: 62 >>=20 >> Cache hits and misses: >> 1s 10s 60s tot >> ARC hits: 124 126 103 101 >> ARC misses: 35 46 29 28 >> ARC demand data hits: 55 90 61 61 >> ARC demand data misses: 20 32 18 17 >> ARC demand metadata hits: 69 36 42 40 >> ARC demand metadata misses: 9 13 10 9 >> ARC prefetch data hits: 0 0 0 0 >> ARC prefetch data misses: 6 1 1 1 >> ARC prefetch metadata hits: 0 0 0 0 >> ARC prefetch metadata misses: 0 0 0 0 >> L2ARC hits: 16 28 14 14 >> L2ARC misses: 19 18 15 14 >> ZFETCH hits: 592 2842 2098 2047 >> ZFETCH misses: 308 1326 507 494 >>=20 >> Cache efficiency percentage: >> 10s 60s tot >> ARC: 73.26 78.03 78.29 >> ARC demand data: 73.77 77.22 78.21 >> ARC demand metadata: 73.47 80.77 81.63 >> ARC prefetch data: 0.00 0.00 0.00 >> ARC prefetch metadata: 0.00 0.00 0.00 >> L2ARC: 60.87 48.28 50.00 >> ZFETCH: 68.19 80.54 80.56 >>=20 >>=20 >>=20 >> _______________________________________________ >> freebsd-stable@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-stable >> To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org" >=20 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to = "freebsd-stable-unsubscribe@freebsd.org"
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