[libvirt] [PATCH v2] libvirtd: Increase NL buffer size for lots of interface

[Leno Hou]

Sorry for the wrong function in libnl3. please use the PATCH v3
On 2016年01月11日 14:46, Leno Hou wrote:
> 1. When switching CPUs to offline/online in a system more than 128 cpus
> 2. When using virsh to destroy domain in a system with more interface
>
> All of above happens nl_recv returned with error: No buffer space available.
> This patch sets the socket buffer size to 128K and turns on message peeking
> for nl_recv,as this would solve this problem totally and permanetly.
>
> Signed-off-by: Leno Hou <houqy at linux.vnet.ibm.com>
> Cc: Wenyi Gao <wenyi at linux.vnet.ibm.com>
> CC: Laine Stump <laine at laine.org>
> CC: Michal Privoznik <mprivozn at redhat.com>
> ---
>   src/util/virnetlink.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c
> index 679b48e..2f2691c 100644
> --- a/src/util/virnetlink.c
> +++ b/src/util/virnetlink.c
> @@ -65,10 +65,12 @@ struct virNetlinkEventHandle {
>
>   # ifdef HAVE_LIBNL1
>   #  define virNetlinkAlloc nl_handle_alloc
> +#  define virSocketSetBufferSize nl_set_buffer_size
>   #  define virNetlinkFree nl_handle_destroy
>   typedef struct nl_handle virNetlinkHandle;
>   # else
>   #  define virNetlinkAlloc nl_socket_alloc
> +#  define virSocketSetBufferSize nl_socket_buffer_size
This should be nl_socket_set_buffer_size


>   #  define virNetlinkFree nl_socket_free
>   typedef struct nl_sock virNetlinkHandle;
>   # endif
> @@ -696,6 +698,14 @@ virNetlinkEventServiceStart(unsigned int protocol, unsigned int groups)
>           goto error_server;
>       }
>
> +    if (virSocketSetBufferSize(srv->netlinknh, 131702, 0) < 0) {
> +        virReportSystemError(errno,
> +                "%s",_("cannot set netlink socket buffer size to 128k"));
> +        goto error_server;
> +    }
> +
> +    nl_socket_enable_msg_peek(srv->netlinknh);
> +
>       if ((srv->eventwatch = virEventAddHandle(fd,
>                                                VIR_EVENT_HANDLE_READABLE,
>                                                virNetlinkEventCallback,