On Thu, Oct 11, 2018 at 9:58 AM Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
>
> If the read is large enough, we end up spinning in the messenger:
>
> libceph: osd0 192.168.122.1:6801 io error
> libceph: osd0 192.168.122.1:6801 io error
> libceph: osd0 192.168.122.1:6801 io error
>
> This is a receive side limit, so only reads were affected.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
> ---
> include/linux/ceph/libceph.h | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
> index 49c93b9308d7..68bb09c29ce8 100644
> --- a/include/linux/ceph/libceph.h
> +++ b/include/linux/ceph/libceph.h
> @@ -81,7 +81,13 @@ struct ceph_options {
>
> #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
> #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)
> -#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
> +
> +/*
> + * Handle the largest possible rbd object in one message.
> + * There is no limit on the size of cephfs objects, but it has to obey
> + * rsize and wsize mount options anyway.
> + */
> +#define CEPH_MSG_MAX_DATA_LEN (32*1024*1024)
>
> #define CEPH_AUTH_NAME_DEFAULT "guest"
>
> --
> 2.14.4
>
Reviewed-by: Jason Dillaman <dillaman@xxxxxxxxxx>
--
Jason
