Date: Thu, 7 Aug 2014 16:27:49 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Mike Tancsa <mike@sentex.net> Cc: "freebsd-emulation@freebsd.org" <emulation@freebsd.org> Subject: Re: Making disk IO place nicely in a guest (VirtualBox) Message-ID: <CA%2BtpaK3b3Zi=6zrFFvLbUmm305zqBL-HV-_ZrcJ4OGAu39dXVA@mail.gmail.com> In-Reply-To: <53E3EA14.2060902@sentex.net> References: <53E3C33E.5030004@sentex.net> <CA%2BtpaK2VzHWrDg1H0XFhEtFPpZ_Q77iCDOJDLBSBS_8YpWEN2Q@mail.gmail.com> <53E3EA14.2060902@sentex.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Aug 7, 2014 at 4:05 PM, Mike Tancsa <mike@sentex.net> wrote: > On 8/7/2014 4:53 PM, Adam Vande More wrote: > >> >> >> Is your swap device ZFS backed like a ZVOL or something? >> > > Hi Adam, > The hypervisor does indeed have swap on zfs. I will try > disabling swap in the guest. I am pretty sure the panic was due to the > guest hitting and stalling on swap inside the VM. The guest dmesg is > attached. > > There does not seem to be much memory pressure on the hypervisor. The > hypervisor disk is a little slow, as I am experimenting with hast to sync > across to another zfs box. However, thats only for a zfs volume that holds > the VM disk images. The OS is not "hastified" > > In the hypervisor > > # pstat -T > 284/514622 files > 51M/16384M swap space > > CPU: 2.6% user, 0.0% nice, 6.6% system, 1.7% interrupt, 89.1% idle > Mem: 191M Active, 277M Inact, 14G Wired, 25M Cache, 1618M Buf, 315M Free > ARC: 7831M Total, 491M MFU, 6986M MRU, 83M Anon, 39M Header, 232M Other > Swap: 16G Total, 51M Used, 16G Free > > The machine has 16G. Should I think of limiting ARC ? The error messages shown are classic swap on ZFS errors which is inherently unstable especially under high IO loads. -- Adam
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CA%2BtpaK3b3Zi=6zrFFvLbUmm305zqBL-HV-_ZrcJ4OGAu39dXVA>