Bugzilla – Bug 1875
Memory leak: LinuxSocketImpl:Send()/Sendto() with DCE Cradle
Last modified: 2014-04-15 09:42:00 EDT
Reported by Siddharth Gangadhar (following email).
When we simulate high speed networks that transfer a large amount of bulk
data over the network (400 Mbps for a length of 1200 seconds), we noticed
that the RAM consumption for the process rises exponentially and reaches
~40-50Gig for the simulation.
Upon further investigation, we noticed that the linux socket does not seem
to delete the temp buffer that it created in the
function LinuxSocketImpl::Send (Ptr<Packet> p, uint32_t flags) in the form
of buf and a delete buf would be needed after the write process to
m_kernsock. A similar delete buf statement would also need to be added to
int LinuxSocketImpl::SendTo (Ptr<Packet> p, uint32_t flags, const Address
After the above change, we noticed that the RAM usage dropped to 200-300 MB
thus validating our change.
The diff is summarized below:
diff -r 73285fae30f9 model/linux/linux-socket-impl.cc
--- a/model/linux/linux-socket-impl.cc Sun Nov 10 00:37:22 2013 +0900
+++ b/model/linux/linux-socket-impl.cc Fri Mar 07 11:09:31 2014 -0600
@@ -354,7 +354,7 @@
NS_LOG_INFO ("send returns " << ret << " errno " << Current ()->err);
+ delete buf;
@@ -399,6 +399,7 @@
NS_LOG_INFO ("sendmsg returns " << ret << " errno " << Current
+ delete buf;
fixed. with the following changeset.
author Siddharth Gangadhar <firstname.lastname@example.org>
Sat, 08 Mar 2014 10:47:18 +0900 (2 minutes ago)
changeset 584 feee7d4dbb7a
parent 583 42c40c4370fd