Date: Mon, 03 Nov 2025 11:57:01 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 290207] [ZFS] lowering "vfs.zfs.arc.max" to a low value causes kernel threads of "arc_evict" to use 91% CPU and disks to wait. System gets unresponsive... Message-ID: <bug-290207-3630-Nswl3nSJ2s@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-290207-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-290207-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D290207 --- Comment #35 from Nils Beyer <nbe@vkf-renzel.de> --- well, "arc_available_memory" is defined as n =3D PAGESIZE * ((int64_t)freemem - zfs_arc_free_target); or [if !defined(UMA_MD_SMALL_ALLOC) && !defined(UMA_USE_DMAP)] n =3D uma_avail() - (long)(uma_limit() / 4); So, in my eyes, for "arc_available_memory" any setting for "vfs.zfs.arc.max= " is ignored and therefore "arc_lowmem" not triggered until the real available f= ree memory goes down - for instance by using a large TMPFS... --=20 You are receiving this mail because: You are the assignee for the bug.=
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