Date: Sat, 19 Mar 2016 20:09:28 -0700 From: "Russell L. Carter" <rcarter@pinyon.org> To: freebsd-virtualization@freebsd.org Subject: Re: UFS vs. ZFS inside bhyve hosted on ZFS Message-ID: <56EE1468.5050503@pinyon.org> In-Reply-To: <56ECAFEB.8060305@pinyon.org> References: <56ECAFEB.8060305@pinyon.org>
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On 03/18/16 18:48, Russell L. Carter wrote: > Greetings, > > So I am becoming quite enamored of an 11-current bhyve guest installed > with ZFS root running on a 10-stable host with ZFS and driven by an > AMD FX-8320. However the 3 cpus I give it seem to translate to a lot > of overhead on the host when building the -current world, determined > by drinking beer and watching htop on both. The guest is running a > GENERIC-NODEBUG kernel, and I'm building with MALLOC_PRODUCTION=yes. > The host is much leaner. > > So I am wondering if UFS in the -current guest might be better > overall. I can certainly do a multiple hour experiment, installing > a new guest with UFS root, but since I am new to this, perhaps there is > conventional wisdom about ZFS vs. UFS in the guest? Maybe UFS in the > guest requires less cpu resources from the host? Or not? I had an off-list suggestion to go ahead and DO THE WORK, so I'm now fairly far down the path. I have two bhyve VMs configured identically, both running r297047, each configured with 15G of RAM and 3 cpus, verified by examining 'sysctl hw' from within the running guest. One has the default ZFS install, the other UFS. However, # cd /usr/src && make buildworld -j <anything> after 15 minutes or so freezes the -current-UFS guest with the following console output: root@vm1:~ # ahcich0: Timeout on slot 29 port 0 ahcich0: is 00000008 cs 00000000 ss 00000000 rs bfffffff tfd 50 serr 00000000 cmd 0001dd17 (ada0:ahcich0:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 40 70 dc 3a 40 00 00 00 00 00 00 (ada0:ahcich0:0:0:0): CAM status: Command timeout (ada0:ahcich0:0:0:0): Retrying command I'm using the defaults for the iohyve script, which are easily extracted if required. The -current-ZFS guest has been completely solid, building ports and world/kernel across multiple revisions. That said I am completely new to this so likely have misconfigured something. Thanks, Russell
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