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

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(a)linux.vnet.ibm.com&gt; Cc: Wenyi Gao <wenyi(a)linux.vnet.ibm.com&gt; CC: Laine Stump <laine(a)laine.org&gt; CC: Michal Privoznik <mprivozn(a)redhat.com&gt; --- 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 # 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, -- 1.9.1