[libvirt] [PATCH v1] libvirtd: Increase NL buffer size for lots of interface

[Leno Hou]

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 set socket buffer size to 128K and turn on message peeking for nl_recv,
as this would solve this problem totally and permanetly.
LTC-Bugzilla: #133359 #125768

Signed-off-by: Leno Hou <houqy at linux.vnet.ibm.com>
Cc: Wenyi Gao <wenyi at linux.vnet.ibm.com>
---
 src/util/virnetlink.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c
index 679b48e..c8c9fe0 100644
--- a/src/util/virnetlink.c
+++ b/src/util/virnetlink.c
@@ -696,6 +696,14 @@ virNetlinkEventServiceStart(unsigned int protocol, unsigned int groups)
         goto error_server;
     }
 
+    if (nl_socket_set_buffer_size(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