Robert Watson wrote:
On Tue, 18 Apr 2006, Stephen Clark wrote:
I have discovered that if I disable quaqqa/ospfd then I don't lose mbufs!
This makes it appear that the mbuf leak is in the multicast routing logic.
In fact I lose mbufs even with the both system basically idle but with a 100
vpn/gre with multicast going on thru the gre then the vpn.
Any ideas on where to focus my continued investigation?
Thanks to everybody who has responded.
Steve,
Sorry not to have caught this thread earlier; I've been on travel for the last
few weeks. My general suggestion would be to try to narrow the code paths
traversed to try to eliminate as much code as possible from the search. It
sounds like you've done that pretty effectively :-).
Typically, memory leaks occur in edge error cases, where the memory is not
properly released, or ownership is unclear. My suggestion would be to add
counters (or look at existing counters where already present) and see if
there's an error case being triggered in about the same quantity that mbuf
leakage is occuring. Chances are, there's an error being returned and a
missing m_freem().
Based on your comments above, I might also pay attention to the routing socket
path -- the rate of leak could correspond to the routing daemons talking to
the network stack, rather than the rate of traffic. For example, it could be
that one of the routing messages is handled improperly resulting in a leak.
Unfortunately, tracking down memory leaks can be quite difficult, and tends to
require a combination of dogged persistence and luck...
Robert N M Watson
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Good news and bad news.
I managed to get enough of our system running on 6.x stable to test and
it does not appear to lose mbufs. Bad news my ipsec transfer rate
dropped from 54mbits/sec to 39mbits/sec. We need to be able to handle a
t3 (45mbits/sec). Any ideas as to why this drop off in 6.x?
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
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