[Bug 275063] kernel using 100% CPU in arc_prune
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Date: Mon, 13 Nov 2023 21:10:33 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275063 Bug ID: 275063 Summary: kernel using 100% CPU in arc_prune Product: Base System Version: Unspecified Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: d8zNeCFG@aon.at Scenario: - FreeBSD stable/14 at e4fb49e867ae70412205d1aade0b76fae158b551 - Doing an rsync from UFS to ZFS, where both are on the same physical disks - The scenario always worked flawlessly on releng/12.4 - 4-core CPU - Running top with H and S keys pressed (show system processes, show threads) Result: - 200% CPU time is used: 100% by rsync, another 100% by something labeled "arc_prune" in top - top snapshot: last pid: 4132; load averages: 2.04, 1.92, 1.69 up 0+13:28:31 22:08:35 369 threads: 7 running, 342 sleeping, 20 waiting CPU: 0.0% user, 0.0% nice, 49.9% system, 0.0% interrupt, 50.1% idle Mem: 64M Active, 142M Inact, 222M Laundry, 2632M Wired, 276M Buf, 12G Free ARC: 661M Total, 153M MFU, 394M MRU, 16M Anon, 14M Header, 68M Other 380M Compressed, 941M Uncompressed, 2.48:1 Ratio Swap: 20G Total, 20G Free PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 0 root -8 - 0B 1376K CPU1 1 28:14 100.00% kernel{arc_prune} 1491 root 132 0 26M 11M CPU2 2 21:04 96.99% rsync 10 root 187 ki31 0B 64K CPU0 0 765:33 83.53% idle{idle: cpu0} 10 root 187 ki31 0B 64K RUN 2 763:29 68.92% idle{idle: cpu2} 10 root 187 ki31 0B 64K RUN 3 762:42 47.56% idle{idle: cpu3} 20 root -16 - 0B 16K vlruwt 3 0:43 3.07% vnlru 2 root -60 - 0B 64K WAIT 0 0:54 0.08% clock{clock (0)} 4132 root 20 0 14M 4188K CPU3 3 0:00 0.06% top 11 root -64 - 0B 256K WAIT 0 0:44 0.01% intr{irq29: ahci1} 4 root -16 - 0B 48K - 3 0:40 0.01% cam{doneq0} 2824 root 20 0 25M 13M select 0 0:00 0.01% xterm 17 root -16 - 0B 48K psleep 0 0:15 0.01% pagedaemon{dom0} 779 root 20 0 33M 6976K select 3 0:05 0.01% mountd 698 root 20 0 13M 1840K select 0 0:04 0.01% powerd 16 root -16 - 0B 16K - 0 0:04 0.01% rand_harvestq 2876 root 20 0 16M 4696K select 0 0:01 0.01% xload 0 root -64 - 0B 1376K - 3 0:03 0.00% kernel{fw0_taskq} 11 root -64 - 0B 256K WAIT 2 0:53 0.00% intr{irq30: re0} 695 root 20 0 19M 6028K select 0 0:03 0.00% ntpd 861 root 20 0 63M 24M select 3 0:01 0.00% httpd 21 root 16 - 0B 16K syncer 0 0:03 0.00% syncer 19 root 20 - 0B 144K sdflus 3 0:01 0.00% bufdaemon{/ worker} 15 root -8 - 0B 1104K mmp->m 2 0:01 0.00% zfskern{mmp_thread_enter} 15 root -8 - 0B 1104K t->zth 0 0:07 0.00% zfskern{arc_reap} ... Expected result: - The system should not slow considerably by spending a full core on "arc_prune" -- Martin -- You are receiving this mail because: You are the assignee for the bug.