Date: Mon, 28 Dec 2020 04:53:58 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 252227] Default value of vm.max_wired is too low in 12.2 Message-ID: <bug-252227-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252227 Bug ID: 252227 Summary: Default value of vm.max_wired is too low in 12.2 Product: Base System Version: 12.2-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: vvd@unislabs.com On 12.2 look like vm.max_wired is a hard limit for number of wired pages for user processes. With 48GB of RAM default value is 9727317 - it's 9727317*4096/1024/1024/1024 = ~37.1GB only. Use case: 1) I see 9GB of free RAM 2) started VM in VirtualBox with 8GB 3) started applications in VM 4) VM freezes with VERR_NO_MEMORY error in VBox.log 5) stopped VM 6) 46*1024*1024*1024/4096 = 12058624 sysctl vm.max_wired=12058624 7) repeat 2) and 3) 8) VM work fine now /usr/src/sys/vm/vm_pageout.c (2082): vm_page_max_user_wired = 4 * freecount / 5; >From dmesg: avail memory = 50130972672 (47808 MB) 47808 MB * 4/5/1024 = 37.35GB ~= 37.1GB IMHO, it's very incorrect! Something like 99/100 look more correct for VM servers with total RAM 48GB: 47808*99/100/1024 = 46.220625 -- You are receiving this mail because: You are the assignee for the bug.home | help
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