11-01-2013
Been doing that for days. We actually have MS engaged. As one would expect Windows operating systems don't suffer the same.
---------- Post updated at 12:18 AM ---------- Previous update was at 12:16 AM ----------
Care to elaborate on severe? Some might consider even 25 or 50% severe.
Note that we also see this performance degradation, in fact worse, using 5.0.7V native on Hyper-V. It is not limited to just the nested hypervisor scenario.
Thanks.
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LEARN ABOUT FREEBSD
hv_ata_pci_disengage
HYPER-V(4) BSD Kernel Interfaces Manual HYPER-V(4)
NAME
hv_ata_pci_disengage -- Hyper-V ATA PCI Disengage driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in the system kernel configuration file:
device hyperv
DESCRIPTION
The hv_ata_pci_disengage driver prevents the native FreeBSD ATA driver from loading in the presence of Hyper-V. FreeBSD guests running on
Hyper-V can take advantage of the Hyper-V Storage Virtual Consumer (hv_storvsc(4)) for using their IDE devices. Since the ATA driver serves
IDE devices as well, there is a chance that the ATA driver may interfere with the operations of hv_storvsc(4). The hv_ata_pci_disengage
driver avoids conflicts between the ATA driver and hv_storvsc(4) by disabling the ATA driver when the FreeBSD guest is booting.
A side effect of disabling the ATA driver is that CDROM may become inoperational on FreeBSD guest partitions. If CDROM access is a must then
users may use "set hw.ata.disk_enable=1" at boot time to prevent the ATA driver from being disabled.
SEE ALSO
hv_netvsc(4), hv_storvsc(4), hv_utils(4), hv_vmbus(4)
HISTORY
Support for hv_ata_pci_disengage first appeared in FreeBSD 10.0. The driver was developed through a joint effort between Citrix Incorpo-
rated, Microsoft Corporation, and Network Appliance Incorporated.
AUTHORS
FreeBSD support for hv_ata_pci_disengage was first added by Microsoft BSD Integration Services Team <bsdic@microsoft.com>.
BSD
September 10, 2013 BSD