diff options
Diffstat (limited to 'share/man/man4/virtio_blk.4')
| -rw-r--r-- | share/man/man4/virtio_blk.4 | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/share/man/man4/virtio_blk.4 b/share/man/man4/virtio_blk.4 index 7be4425..d71ca7e 100644 --- a/share/man/man4/virtio_blk.4 +++ b/share/man/man4/virtio_blk.4 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd January 22, 2012 +.Dd July 2, 2013 .Dt VIRTIO_BLK 4 .Os .Sh NAME @@ -53,11 +53,33 @@ Tunables can be set at the .Xr loader 8 prompt before booting the kernel or stored in .Xr loader.conf 5 . -.Bl -tag -width "xxxxxx" +.Bl -tag -width indent .It Va hw.vtblk.no_ident -This tunable disables retrieving the device identification string -from the hypervisor. +.It Va hw.vtblk. Ns Ar X Ns Va .no_ident +.Pp +These tunables disable retrieving the device identification string +from the hypervisor either globally or per-device. The default value is 0. +.It Va hw.vtblk.writecache_mode +.It Va hw.vtblk. Ns Ar X Ns Va .writecache_mode +.Pp +These tunables determine the write cache mode globally or per-device. +The mode can changed only if the ConfigWCE feature is negotiated. +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. +.El +.Sh SYSCTL VARIABLES +The following variables are available as +.Xr sysctl 8 +variables. +.Bl -tag -width indent +.It Va dev.vtblk. Ns Ar X Ns Va .writecache_mode +.Pp +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. .El .Sh SEE ALSO .Xr virtio 4 |
