Date: Thu, 30 Jan 2020 10:00:13 +0000 From: Matt Churchyard <matt.churchyard@userve.net> To: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: System (ps/top) & bhyvectl memory usage differences Message-ID: <2fc4d1eaa382463a9799dd6214aa77ef@SERVER.ad.usd-group.com>
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Hello, Is there a reason why the resident memory used by a bhyve guest is quite different when comparing ps/top & bhyvectl? Does bhyvectl take in account something in kernel space that top/ps doesn't see? USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND root 12670 0.1 1.4 2120984 951764 1 SC+ 22Jan20 157:29.22 bhyve: smtp-a (bhyve) # bhyvectl --get-stats --vm=smtp-a | grep Res Resident memory 1439875072 1.4G vs 925M ----- Another thing I've just remembered, which is probably unrelated to the above but still concerning memory. I have a guest with 2G memory allocated, and dmesg lists 2048MB real memory. The real & avail figures are also quite close which resembles the output I generally expect on real hardware. Hypervisor: Origin = "bhyve bhyve " real memory = 2147483648 (2048 MB) avail memory = 2043318272 (1948 MB) However, I have a guest with 5G allocated, and get the following in dmesg - Hypervisor: Origin = "bhyve bhyve " real memory = 6442450944 (6144 MB) avail memory = 5141663744 (4903 MB) bhyveload -m 5G ... bhyve -c 2 -m 5G -AHP ... I haven't tested where it seems to change. My only theory is that it could possibly be something to do with crossing the old 32bit limit? Regards, Matt Churchyardhelp
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