bhyve uses all available memory during IO-intensive operations

[Shane Ambler]

On 01/12/2017 13:43, Allan Jude wrote:
> On 2017-11-30 22:10, Dustin Wenz wrote:
>> I am using a zvol as the storage for the VM, and I do not have any ARC
>> limits set. However, the bhyve process itself ends up grabbing the vast
>> majority of memory. 
>>
>> I’ll run a test tomorrow to get the exact output from top.
>>
>> Â  Â - .Dustin
>>
>> On Nov 30, 2017, at 5:28 PM, Allan Jude <allanjude at freebsd.org
>> <mailto:allanjude at freebsd.org>> wrote:
>>
>>> On 11/30/2017 18:15, Dustin Wenz wrote:
>>>> I'm using chyves on FreeBSD 11.1 RELEASE to manage a few VMs (guest
>>>> OS is also FreeBSD 11.1). Their sole purpose is to house some
>>>> medium-sized Postgres databases (100-200GB). The host system has 64GB
>>>> of real memory and 112GB of swap. I have configured each guest to
>>>> only use 16GB of memory, yet while doing my initial database imports
>>>> in the VMs, bhyve will quickly grow to use all available system
>>>> memory and then be killed by the kernel:
>>>>
>>>> Â  Â kernel: swap_pager: I/O error - pageout failed; blkno 1735,size
>>>> 4096, error 12
>>>> Â  Â kernel: swap_pager: I/O error - pageout failed; blkno 1610,size
>>>> 4096, error 12
>>>> Â  Â kernel: swap_pager: I/O error - pageout failed; blkno 1763,size
>>>> 4096, error 12
>>>> Â  Â kernel: pid 41123 (bhyve), uid 0, was killed: out of swap space

That's the type of errors I see when wired jumps high. I'm not seeing
this from bhyve but when your watching top, keep an eye on the wired
amount.

-- 
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Shane Ambler