Re: [Qemu-devel] [PATCH] qemu-options: explain disk I/O throttling options

[Eric Blake]

On 02/20/2017 10:52 AM, Stefan Hajnoczi wrote:
> The disk I/O throttling options have been listed for a long time but
> never explained on the QEMU man page.
> 
> Suggested-by: Nini Gu <n...@redhat.com>
> Cc: Alberto Garcia <be...@igalia.com>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> ---
>  qemu-options.hx | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 5633d39..b2254cc 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -587,6 +587,31 @@ file sectors into the image file.
>  conversion of plain zero writes by the OS to driver specific optimized
>  zero write commands. You may even choose "unmap" if @var{discard} is set
>  to "unmap" to allow a zero write to be converted to an UNMAP operation.
> +@item bps=@var{b},bps_rd=@var{r},bps_wr=@var{w}
> +Specify bandwidth throttling limits in bytes per second, either for all 
> request
> +types or for reads or writes only.  Values must be larger than the maximum
> +request size to avoid timeouts or hangs in the guest.  At minimum use 2 MB/s

s/At minimum/At a minimum,/

With that tweak,
Reviewed-by: Eric Blake <ebl...@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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