> Op 11 september 2017 om 13:04 schreef Ivan Kudryavtsev > <kudryavtsev...@bw-sw.com>: > > > Hi, Wido. > > Yes, you can. But it works not the way I expect because It cuts RAM from VM > by dividing it to overprovisioning factor like VM with 2GB of RAM with > Overprovisioning factor 2.0 will get 1GB displayed with "free" command. > That's why I finished the message with words that it might be I just don't > get the idea. The behaviour is the same in my prod 4.3 and new 4.9. >
Hmm, ok. So for the KVM Agent you can add "host reserved mb" to the agent.properties, but you are proposing a setting where you can multiply the memory? Eg by 1.5 if you want to and have the Agent expose that to the MGMT server? Wido > 2017-09-11 18:00 GMT+07:00 Wido den Hollander <w...@widodh.nl>: > > > Hi, > > > > > Op 10 september 2017 om 8:37 schreef Ivan Kudryavtsev < > > kudryavtsev...@bw-sw.com>: > > > > > > > > > Hello, community. > > > > > > During the last years Linux kernel got some interesting features like > > KSM, > > > ZSWAP, ZRAM. Hardware also steps forward and we see Intel 3d xpoint, > > > extremely fast SSD drives with m.2 and PCI-E interfaces. > > > > > > These facilities enable potentially interesting use of overcommited RAM > > for > > > hosts. According to IBM's investigations Zswap with LZ4/ZBUD increases > > > virtual RAM on 40%. > > > > > > I investigated current Apache CloudStack memory overcommitment > > capabilities > > > and they mostly affect VM's RAM by utilizing ballooning and I think it's > > > not what necessary to open new facilities. There are many cases which can > > > utilize ZSWAP and fast swap devices to efficiently provision more RAM > > than > > > presents. > > > > > > I suppose, CloudStack Agent for KVM can have configured parameter which > > > "mangles" RAM reported. From the other hand it can be done by implemented > > > host properties on server side. I tried manual increasing in host table: > > > > > > update host set ram=ram * 1.4 where id=1; > > > > > > and it seems until the next host stats update it works as expected. I > > think > > > this workaround is useful, but it's better to have the function in core > > > like standard. > > > > > > > Can't you set memory over provisioning on a cluster basis in the GUI? I > > thought you could. > > > > Wido > > > > > Let me know what you think about it, it might be I don't understand > > > something and ACS already has it in place? I also would like to hear your > > > thoughts on ZSWAP usage in practice. > > > > > > -- > > > With best regards, Ivan Kudryavtsev > > > Bitworks Software, Ltd. > > > Cell: +7-923-414-1515 > > > WWW: http://bitworks.software/ <http://bw-sw.com/> > > > > > > -- > With best regards, Ivan Kudryavtsev > Bitworks Software, Ltd. > Cell: +7-923-414-1515 > WWW: http://bitworks.software/ <http://bw-sw.com/>
