Date: Sat, 09 Dec 2017 18:27:52 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 224080] ZFS: "arc_dnlc_evicts_thr" + "arc_reclaim_thread" - high CPU load during poudriere build... Message-ID: <bug-224080-3630-bQwIdao0Cg@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-224080-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-224080-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224080 --- Comment #29 from Cy Schubert <cy@FreeBSD.org> --- (In reply to Jeff Roberson from comment #26) I've applied a patch similar to the one discussed here. There is some improvement but more testing and comparison with r326347 removed is needed. On my two 8 GB machines (with zfs arc tuning removed from loader.conf) I ge= t: 2 core + 2 threads: CPU: 0.9% user, 95.9% nice, 3.0% system, 0.0% interrupt, 0.2% idle Mem: 1500M Active, 318M Inact, 33M Laundry, 1762M Wired, 154M Buf, 4148M Fr= ee ARC: 840M Total, 141M MFU, 545M MRU, 16M Anon, 12M Header, 127M Other 288M Compressed, 893M Uncompressed, 3.10:1 Ratio slippy# sysctl vm.kmem_size vm.kmem_size: 8138756096 slippy# sysctl vm.kmem_size_max vm.kmem_size_max: 1319413950874 slippy# sysctl hw.physmem hw.physmem: 8365903872 slippy#=20 slippy$ sysctl vfs.zfs.arc_max=20=20 vfs.zfs.arc_max: 7065014272 slippy$=20 2 core: CPU: 0.0% user, 94.9% nice, 4.1% system, 0.6% interrupt, 0.4% idle Mem: 752M Active, 269M Inact, 1705M Wired, 111M Buf, 5215M Free ARC: 862M Total, 218M MFU, 456M MRU, 15M Anon, 15M Header, 156M Other 343M Compressed, 1079M Uncompressed, 3.15:1 Ratio cwsys# sysctl vm.kmem_size vm.kmem_size: 8325849088 cwsys# sysctl vm.kmem_size_max vm.kmem_size_max: 1319413950874 cwsys# sysctl hw.physmem hw.physmem: 8566394880 cwsys#=20 cwsys$ sysctl vfs.zfs.arc_max=20=20 vfs.zfs.arc_max: 7252107264 cwsys$=20 It appears arc is being limited to ~ 840 - 860 MB on the 8 GB machines. The 5 GB machine (2 core): CPU: 0.0% user, 95.1% nice, 4.7% system, 0.2% interrupt, 0.0% idle Mem: 590M Active, 147M Inact, 1126M Wired, 101M Buf, 3077M Free ARC: 488M Total, 50M MFU, 334M MRU, 6630K Anon, 5713K Header, 91M Other 107M Compressed, 431M Uncompressed, 4.02:1 Ratio bob# sysctl vm.kmem_size vm.kmem_size: 5180735488 bob# sysctl vm.kmem_size_max vm.kmem_size_max: 1319413950874 bob# sysctl hw.physmem hw.physmem: 5345284096 bob#=20 bob# sysctl vfs.zfs.arc_max=20=20 vfs.zfs.arc_max: 4106993664 bob#=20 We might want to consider reverting r326347 until we can fix this. --=20 You are receiving this mail because: You are the assignee for the bug.=
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