Date: Wed, 13 Aug 2025 22:05:12 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 288856] freebsd-update slow Message-ID: <bug-288856-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288856 Bug ID: 288856 Summary: freebsd-update slow Product: Base System Version: Unspecified Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: misc Assignee: bugs@FreeBSD.org Reporter: heikki@suonsivu.net For any computer with small memory (such as sub-1G), such as embedded system, small raspberry, etc, freebsd-update is extremely slow when going upgrade. It seems that many people as seeing this. This is typically not I/O bound (fast ssd's mirrored with gmirror, systat shows %busy few percent) nor it is network bound (doing install, so no more network activity, and our network connectivity is 10G with beefy internal network). Symptom seems to be high system load %. I am usually doing this on gmirrored ssd's, but others seem to see this on zfs root as well. Theory: One possible reason seems to be that /var/db/freebsd-update/files has very large number of files in a single directory, for example, right now in the system I am doing "freebsd-update install", it has 124211 files at this moment. systat first showed 99.5% system time, and after a while system time becomes around 70%. According to systat, dir-cache only gets 1% hit ratio, if that is relevant? In systems with considerably larger memory this effect is not clearly visible, though that might also be faster cpus. There seems to be similar reports when running freebsd-update in a VM with small memory allocation so it might be that fast cpu does not help. Suggestion: as the file names are hashed anyway, take, say two first letters, and build a/b/abf222etcfullhashedname.gz directory hierachy, keeping the directories smaller. -- You are receiving this mail because: You are the assignee for the bug.home | help
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