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HMP Linux 1.2 Release Update, Rev 05 — September 2006 24
the 32 second timeout is reached, a CANCEL will be sent by HMP to the remote site. If
there is no response by the remote site to the CANCEL, there will be an additional 32
second timeout, at the end of which, a GCEV_DISCONNECTED event will be reported.
Supervised Transfer
H.450.2 Supervised Transfer has not been tested with Cisco 5300 running IOS 12.3(8).
2.4 Operating System Notes
Using Multiple NICs Under Heavy Loads
When using multiple network interface cards (NICs) under heavy loads, kernel assertions
may occur.
Symptom: Calls may fail with the following message displayed:
kernel: KERNEL: assertion (flags & MSG_PEEK) > failed at net/ipv4/tcp.c
(1284)
Solutions:
Resolution 1 - If you have two NICs on one segment, turn off Forwarding on at least one
of the NICs.
Eth0: 192.168.66.21
Eth2: 192.168.66.77
net.ipv4.conf.eth0.forwarding = 0
net.ipv4.conf.eth2.forwarding = 0
Resolution 2 - Update the following system parameters as shown:
sysctl -w net.ipv4.tcp_max_syn_backlog=2048
sysctl -w net.ipv4.route.max_size=1048576
sysctl -w net.ipv4.route.gc_thresh=65536
Elvtune Using IOCTLS
Elvtune using IOCTLS is now deprecated. To tune the IO scheduler, use the files exported
to the sysfs directory.
/sys/block/<device>/queue/iosched