vt(4) performance on Hyper-V
Hi! Just in case, just so you know. I've tried FreeBSD 10-STABLE r270125 with vt(4) on Hyper-V (Win Server 2012 DataCenter). Its performance is extremely bad (while syscons is ok). Here is video http://www.youtube.com/watch?v=62CIKCJ7bog P.S. vt(4) is a bit faster on VirtualBox though when I tried it last time. ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to freebsd-virtualization-unsubscr...@freebsd.org
Re: vt(4) performance on Hyper-V
Wow, thank you! It helped. Sorry for the noise, it's even written in man vt. 2014-08-18 12:25 GMT+04:00 Luigi Rizzo ri...@iet.unipi.it: On Mon, Aug 18, 2014 at 9:08 AM, Pavel Timofeev tim...@gmail.com wrote: Hi! Just in case, just so you know. I've tried FreeBSD 10-STABLE r270125 with vt(4) on Hyper-V (Win Server 2012 DataCenter). Its performance is extremely bad (while syscons is ok). Here is video http://www.youtube.com/watch?v=62CIKCJ7bog i think you need to put the following in /boot/loader.conf hw.vga.textmode=1 otherwise it is very slow even on bare metal. cheers luigi P.S. vt(4) is a bit faster on VirtualBox though when I tried it last time. ___ freebsd-sta...@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to freebsd-stable-unsubscr...@freebsd.org -- -+--- Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/. Universita` di Pisa TEL +39-050-2211611 . via Diotisalvi 2 Mobile +39-338-6809875 . 56122 PISA (Italy) -+--- ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to freebsd-virtualization-unsubscr...@freebsd.org
libvirt and rebooting of a bhyve VM
Roman, I am using libvirt and bhyve according to this XML: http://libvirt.org/drvbhyve.html and it works great. I gave a presentation at BAFUG on this: http://www.slideshare.net/CraigRodrigues1/libvirt-bhyve I have one question. If I reboot the bhyve VM started with libvirt with shutdown -r now, the VM shuts down, but it does not restart. How can I get the machine to reboot with shutdown -r now when started with libvirt? Thanks -- Craig ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to freebsd-virtualization-unsubscr...@freebsd.org
Re: Problem with vmexit on mtrap
Hi Martin, On Sat, Aug 16, 2014 at 12:33 PM, Martin Steegmanns mar...@unix-users.de wrote: On Tue, Aug 12, 2014 at 06:39:18PM -0700, Neel Natu wrote: The VM-exit instruction length field is valid only for a subset of VM exits. See section 27.2.4 Information for VM exits due to instruction execution in the Intel SDM. In particular, the instruction length is not guaranteed to be valid if the VM-exit is due to a hardware exception. Therefore it cannot be used to skip over the UD2 instruction. On my machine the VM-exit instruction length field was set to '2' for the first UD2 and '5' for the second UD2. OK, thx for the clarification. For this specific test, you can either hardcode the instruction length to '2' if the VM exit is due to a UD2 or use an instruction like OUT to a specific I/O port to trigger the monitor-trap-flag on and off. A VM-exit due to OUT will have the correct value in the VM-exit instruction length field. But this instruction length issue only affects my way to toggle the MTF bit. The MTF itself does not rely internally on the instruction length field, or does it? As far as I understand, bhyve does not need a valid instruction length for MTF, because the handler returns VMEXIT_RESTART. No need for bhyve to adjust the rip on vmentry. If I set the MTF bit via bhyvectl, the guest system still seems to enter a loop. My mtrap handler writes the RIP to a file, but all I see are high addresses e.g: 0x806bf0b0 Xapic_isr1 According to kdb, these are addresses point to Xapic_isr1 and interrupt handlers. I wonder if a vmexit caused by the MTF could overlay with another vmexit. With the MTF bit set, I expect the guest system to behave exactly as without the MTF bit. Of course slower due to single stepping :). On my Xeon E5-2650 running at 2.0GHz a single vcpu VM is still not at the login prompt after 7+ hours with MTRAP enabled. However, it is making forward progress and is chugging through the /etc/rc startup scripts very slowly. best Neel Regards, Martin ___ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to freebsd-virtualization-unsubscr...@freebsd.org
