Date: Mon, 13 Oct 2025 11:37:27 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 275594] High CPU usage by arc_prune; analysis and fix Message-ID: <bug-275594-3630-n1YG8ECdMH@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-275594-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-275594-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D275594 Nils Beyer <nbe@vkf-renzel.de> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nbe@vkf-renzel.de --- Comment #150 from Nils Beyer <nbe@vkf-renzel.de> --- Hi, that "arc_prune" misbehaviour still exists on 15.0-BETA1. To reproduce quic= kly do the following: sysctl vfs.zfs.arc.max=3D536870912 zpool scrub <YOURPOOLNAME> Here, two threads "arc_prune" with 91% CPU each spawn, and the throughputs = of the SSDs go down to about 5-20MB/s. To recover: sysctl vfs.zfs.arc.max=3D2147483648 (Note: vfs.zfs.arc.max=3D0 will NOT recover it) BR, Nils --=20 You are receiving this mail because: You are on the CC list for the bug.=
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