On Fri, 2014-06-20 at 15:07 -0600, Jim Fehlig wrote:
> The libxl driver currently sets the disk backend to
> LIBXL_DISK_BACKEND_TAP when <driver name='file'> is specified
> in the <disk> config. qdisk should be prefered with this
> configuration, otherwise existing configuration such as the
> following, which worked with the old Xen driver, will not work
> with the libxl driver
OOI why not let libxl pick the most appropriate backend for (most of)
these alternatives?
>
> <disk type='file' device='cdrom'>
> <driver name='file'/>
> <source file='/path/to/some/iso'/>
> <target dev='hdc' bus='ide'/>
> <readonly/>
> </disk>
>
> In addition, tap performs poorly compared to qdisk.
>
> Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
> ---
> src/libxl/libxl_conf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index fdbb522..4b6b5c0 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -796,7 +796,7 @@ libxlMakeDisk(virDomainDiskDefPtr l_disk, libxl_device_disk *x_disk)
> return -1;
> }
> x_disk->format = LIBXL_DISK_FORMAT_RAW;
> - x_disk->backend = LIBXL_DISK_BACKEND_TAP;
> + x_disk->backend = LIBXL_DISK_BACKEND_QDISK;
> } else if (STREQ(driver, "phy")) {
> if (format != VIR_STORAGE_FILE_NONE &&
> format != VIR_STORAGE_FILE_RAW) {
--
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