@li jerry <div...@hotmail.com> if ACS tells you your KVM host has 16GB instead 256GB - that is wrong by all means - and you should try to see where this comes from (have you upgraded the host in the meantime, or did anything with it) ? Even with your break-down of total/cache/buffers etc - your host *should* has more than 100GB free (buffers + cache = 92GB out of 256B)
You should check you "slab" usage etc - there are other "hiden" RAM usage beside the buffer and cache. Best, On Thu, 16 Jul 2020 at 17:24, Riepl, Gregor (SWISS TXT) < gregor.ri...@swisstxt.ch> wrote: > Sounds like a calculation bug in cloudstack-agent then. > You should probably report it on Github. > ________________________________ > From: li jerry <div...@hotmail.com> > Sent: 15 July 2020 12:08 > To: users@cloudstack.apache.org <users@cloudstack.apache.org> > Subject: 回复: KVM host AvailableMemory data is incorrect > > In my scene > > KVM host > cat /proc/meminfo > MemTotal=256G > MemFree=4G > Cached=12G > Buffers=80G > > When I want to deploy a VM with 32G memory to this host, it prompts that > the resources are insufficient (mem.overprovisioning.factor=1.0). > > CLOUDSTACK tells me that KVMHOST has 16GB of available memory (it does not > count Buffers). So 16<32, so there is not enough data. > > > But I manually started a VM with 32G memory on KVM HOST, and it succeeded; > and Buffers/cached/memfree/they were reduced accordingly. > > therefore: > Can we add the memory occupied by Buffers to AvailableMemory and report to > CLOUDSTACK? > > -----邮件原件----- > 发件人: Riepl, Gregor (SWISS TXT) <gregor.ri...@swisstxt.ch> > 发送时间: 2020年7月15日 17:41 > 收件人: users@cloudstack.apache.org > 主题: Re: KVM host AvailableMemory data is incorrect > > This sounds very familiar... > > https://bugzilla.redhat.com/show_bug.cgi?id=1250060 > and they rolled it back in > https://bugzilla.redhat.com/show_bug.cgi?id=1779609 > because upstream didn't accept their patch. > > We had to "fix" our memory monitoring twice because of this. > > It's important to *not* calculate buffer/cache memory towards memory > usage, because the kernel can reclaim this memory whenever there is a need. > ________________________________ > From: li jerry <div...@hotmail.com> > Sent: 15 July 2020 08:27 > To: users@cloudstack.apache.org <users@cloudstack.apache.org> > Subject: KVM host AvailableMemory data is incorrect > > Hello everyone > We use HCI to run CloudStack (KVM+CEPH). After running for a period > of time, cloudstack reports that HOST has no available memory. But ZABBIX > monitoring shows that HOST still has a lot of available memory. By > observing /proc/meminfo on KVM HOST, it is found that most of the memory is > occupied by Buffers. > > Further analysis of the source code of cloudstack-agent shows that > the algorithm for cloudstack-agent to obtain AvailableMemory on the host is: > > Cached +MemFree -reservedMemory +overCommitMemory > > It does not calculate the memory occupied by Buffers. > > > Excuse me, can I mark the memory occupied by Buffers as AvailableMemory? > > If not, what is the reason? > > Thank you! > > > - Jerry > -- Andrija Panić
