Date: Thu, 30 Nov 2017 21:10:26 -0600 From: Dustin Wenz <dustinwenz@ebureau.com> To: Allan Jude <allanjude@freebsd.org> Cc: freebsd-virtualization@freebsd.org Subject: Re: bhyve uses all available memory during IO-intensive operations Message-ID: <F633EDFD-E9DA-47A3-AEFD-ED9C499FBD29@ebureau.com> In-Reply-To: <a324b830-b941-2767-2272-957da680d997@freebsd.org> References: <F4E35CB9-30F9-4C63-B4CC-F8ADC9947E3C@ebureau.com> <a324b830-b941-2767-2272-957da680d997@freebsd.org>
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I am using a zvol as the storage for the VM, and I do not have any ARC limit= s set. However, the bhyve process itself ends up grabbing the vast majority o= f memory.=20 I=E2=80=99ll run a test tomorrow to get the exact output from top. - .Dustin > On Nov 30, 2017, at 5:28 PM, Allan Jude <allanjude@freebsd.org> wrote: >=20 >> 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 Postgr= es databases (100-200GB). The host system has 64GB of real memory and 112GB o= f swap. I have configured each guest to only use 16GB of memory, yet while d= oing my initial database imports in the VMs, bhyve will quickly grow to use a= ll available system memory and then be killed by the kernel: >>=20 >> kernel: swap_pager: I/O error - pageout failed; blkno 1735,size 4096, e= rror 12 >> kernel: swap_pager: I/O error - pageout failed; blkno 1610,size 4096, e= rror 12 >> kernel: swap_pager: I/O error - pageout failed; blkno 1763,size 4096, e= rror 12 >> kernel: pid 41123 (bhyve), uid 0, was killed: out of swap space >>=20 >> The OOM condition seems related to doing moderate IO within the VM, thoug= h nothing within the VM itself shows high memory usage. This is the chyves c= onfig for one of them: >>=20 >> bargs -A -H -P -S >> bhyve_disk_type virtio-blk >> bhyve_net_type virtio-net >> bhyveload_flags >> chyves_guest_version 0300 >> cpu 4 >> creation Created on Mon Oct 23 16:17:04 CDT 2017 by c= hyves v0.2.0 2016/09/11 using __create() >> loader bhyveload >> net_ifaces tap51 >> os default >> ram 16G >> rcboot 0 >> revert_to_snapshot >> revert_to_snapshot_method off >> serial nmdm51 >> template no >> uuid 8495a130-b837-11e7-b092-0025909a8b56 >>=20 >>=20 >> I've also tried using different bhyve_disk_types, with no improvement. Ho= w is it that bhyve can use far more memory that I'm specifying? >>=20 >> - .Dustin >>=20 >=20 > Can you show 'top' output. What makes you think bhyve is using the > memory? Are you using ZFS? Have you limited the vfs.zfs.arc_max to leave > some free RAM for the bhyve instances? >=20 > --=20 > Allan Jude > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freeb= sd.org"
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