Commit 1199edb1d4e3 added config option max_queued_clients and documented the default value as 1000 but never actually set that value. This patch sets the default value. This addresses an issue whereby the following error message is reported if too many migrations are started simultaneously: error: End of file while reading data: Ncat: Invalid argument.: Input/output error The problem is that too many ncat processes are spawned on the destination system. They all attempt to connect to the libvirt socket. Because the destination libvirtd cannot respond to the connect requests quickly enough we overrun the socket's pending connections queue. Signed-off-by: Jason J. Herne <jjherne(a)linux.vnet.ibm.com&gt; Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.vnet.ibm.com&gt; --- daemon/libvirtd-config.c | 1 + 1 file changed, 1 insertion(+) diff --git a/daemon/libvirtd-config.c b/daemon/libvirtd-config.c index c31c8b2..7a448f9 100644 --- a/daemon/libvirtd-config.c +++ b/daemon/libvirtd-config.c @@ -280,6 +280,7 @@ daemonConfigNew(bool privileged ATTRIBUTE_UNUSED) data->min_workers = 5; data->max_workers = 20; data->max_clients = 5000; + data->max_queued_clients = 1000; data->max_anonymous_clients = 20; data->prio_workers = 5;