10-26-2018
with scsi-virtio controller and qemu 3.0 best work with
cache=unsafe
io=threads
discard mode=ignore
detect zeroes=off
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LEARN ABOUT FREEBSD
virtio_blk
VIRTIO_BLK(4) BSD Kernel Interfaces Manual VIRTIO_BLK(4)
NAME
virtio_blk -- VirtIO Block driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device virtio_blk
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
virtio_blk_load="YES"
DESCRIPTION
The virtio_blk device driver provides support for VirtIO block devices.
LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5).
hw.vtblk.no_ident
hw.vtblk.X.no_ident
These tunables disable retrieving the device identification string from the hypervisor either globally or per-device. The default
value is 0.
hw.vtblk.writecache_mode
hw.vtblk.X.writecache_mode
These tunables determine the write cache mode globally or per-device. The mode can changed only if the ConfigWCE feature is negoti-
ated. Set to 0 for writethrough mode, 1 for writeback mode, and -1 to leave it as-is. The default value is to leave as-is.
SYSCTL VARIABLES
The following variables are available as sysctl(8) variables.
dev.vtblk.X.writecache_mode
The write cache mode of the device can be either writethrough (0) or writeback (1). If the ConfigWCE feature is negotiated, the
write cache mode can be toggled between writethrough and writeback.
SEE ALSO
virtio(4)
HISTORY
The virtio_blk driver was written by Bryan Venteicher <bryanv@FreeBSD.org>. It first appeared in FreeBSD 9.0.
BSD
July 2, 2013 BSD