<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=Windows-1252"> <style type="text/css" style="display:none;"></style> </head> <body dir="ltr"> <div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:Calibri,Arial,Helvetica,sans-serif;" dir="ltr"> Hi, I want to start 12 kvm machines in my global zone and I end up in an memlock issue after the 6th machine: qemu_mlock: have only locked 0 of 7516192768 bytes; still trying… The details: # echo "::memstat" | mdb -k Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 1462114 5711 5% Boot pages 166 0 0% ZFS File Data 143529 560 0% Anon 27477 107 0% Exec and libs 1244 4 0% Page cache 4911 19 0% Free (cachelist) 3597 14 0% Free (freelist) 29809914 116444 95% Total 31452952 122863 Physical 31452951 122863 # My pagesize is: # pagesize 4096 # so 31452952 pages = (122863*1024*1024) bytes / 4096 (bytes) thus: 31452952 / 256 = 122863MB That's correct. So pages to MB we can divide by 256. MB to pages, multiply with 256. I want 8GB per vm and I want 12vm's. This is 96GB (98304MB) -> needs 98304 * 256 = 25165824 pages. 31452952 - 25165824 = 6287128 left (or 24559 MB ~ 23.9GB ) I reserved (in /etc/system ) 15 GB for zfs arc 15GB = 15360 MB = 3932160 pages So this gives 6287128 - 3932160 = 2354968 pages left (or 9199MB ~ 8.98 GB) -> this should be sufficient for omnios to run. Unless I'm not aware of other things, which is very well possible. So remember Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- ... Free (cachelist) 3597 14 0% Free (freelist) 29809914 116444 95% Total 31452952 122863 Physical 31452951 122863 # Let's boot one kvm with 8GB ram for the vm. We expect to see (8GB *1024) * 256 = 2097152 pages be eaten up. So we should end up with 31452952 - 2097152 = 29355800 pages. OR if we are eating from the "Free" part, we should end up with 29809914 - 2097152 = 27712762 pages (or 108252MB ~105.71 GB) Let's confirm: Before boot: # mdb -ke 'availrmem/D ; pages_pp_maximum/D' availrmem: availrmem: 29845807 pages_pp_maximum: pages_pp_maximum: 1216998 # Boot the machine. # echo "::memstat" | mdb -k Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 1472257 5751 5% Boot pages 166 0 0% ZFS File Data 149321 583 0% Anon 2139596 8357 7% Exec and libs 1549 6 0% Page cache 4955 19 0% Free (cachelist) 3445 13 0% Free (freelist) 27681663 108131 88% <<<----- 27712762 pages Total 31452952 122863 Physical 31452951 122863 # mdb -ke 'availrmem/D ; pages_pp_maximum/D' availrmem: availrmem: 26621718 pages_pp_maximum: pages_pp_maximum: 1216998 # look there. We expected to end up with 29355800 pages or 27712762 free pages. If we check in the available memory 29845807 - 26621718 = 3224089 pages were consumed (12594.09MB ~ 12.29GB ) Double check: 29809914 - 27681663 = 2128251 pages consumed ( 8313.48MB ~ 8.11GB ) And this for a machine of 8GB. Let's do a test with a vm with 4GB allocated ( 1048576 pages ) Before boot: # echo "::memstat" | mdb -k Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 1476857 5768 5% Boot pages 166 0 0% ZFS File Data 176243 688 1% Anon 2139416 8357 7% Exec and libs 1549 6 0% Page cache 4961 19 0% Free (cachelist) 3440 13 0% Free (freelist) 27650320 108009 88% Total 31452952 122863 Physical 31452951 122863 # mdb -ke 'availrmem/D ; pages_pp_maximum/D' availrmem: availrmem: 26596813 pages_pp_maximum: pages_pp_maximum: 1216998 # So we expect 27650320 - 1048576 = 26601744 free pages (103913.06 MB ~ 101.47 GB free) or 26596813 - 1048576 = 25548237 free pages (99797.80 MB ~ 97.45 GB free) Booting the vm. And the aftermath: # ./start_kvm_pogo.sh qemu-system-x86_64: -net vnic,vlan=40,name=net0,ifname=vnic_kvm_pogo0,macaddr=2:8:20:87:2f:69: vnic dhcp disabled Started VM: pogo VNC available at: host IP 127.0.0.1 10.0.1.171 ::1/128 ::/0 port 5900 QEMU Monitor, do: # telnet localhost . Note: use Control ] to exit monitor before quit! # Check the values # echo "::memstat" | mdb -k Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 1482301 5790 5% Boot pages 166 0 0% ZFS File Data 180958 706 1% Anon 3198541 12494 10% Exec and libs 1549 6 0% Page cache 4961 19 0% Free (cachelist) 3440 13 0% Free (freelist) 26581036 103832 85% Total 31452952 122863 Physical 31452951 122863 # # mdb -ke 'availrmem/D ; pages_pp_maximum/D' availrmem: availrmem: 24472324 pages_pp_maximum: pages_pp_maximum: 1216998 # let's verify. Test1: 27650320 - 26581036 = 1069284 pages consumed ( 4176.89 MB ~ 4GB ) Test 2: 26596813 - 24472324 = 2124489 pages consumed ( 8298.78 MB ~ 8.10GB ) 3 questions remain. - Why does this happen. If we check using the memstat it's fairly ok, but appearently this is not correct as I can't start the 12 machines. - How to avoid this. If I say to kvm "use 8GB" I want it to use 8GB not 12GB. Or am I missing something crucial? - If it's a (kernel) parameter ... which one and how to set it? Thanks and best regards, Pieter <div style="color: rgb(0, 0, 0);"> <div></div> </div> </div> </body> </html>