Date: Sun, 11 Dec 2005 03:26:50 -0800 (PST) From: kamal kc <kamal_ckk@yahoo.com> To: freebsd <freebsd-net@freebsd.org> Subject: high interrupts by network interfaces Message-ID: <20051211112650.67553.qmail@web35715.mail.mud.yahoo.com>
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dear everybody,
i modified the bridge.c file and added a routine to
compress/decompress
ip packet. i put my code in bdg_forward(). And ran the
pc in bridge mode.
The modified kernel is deployed in network where the
datarate is
about 4 to 6 Mbps. One thing to be noted is that the
pc receives
continues data at 4 to 6 Mbps rather than sudden burst
at intervals.
Now the problem is, I am getting very high interrupts
from the network
interfaces. the cpu utilization by the interrupts is
high due to which there
is latency added to the packets forwarded by the pc.
The pc attempts to
compress/decompress all tcp packets.
BELOW is some helpful information about the pc and top
output.
pc spec
---------
CPU: Intel(R) Pentium(R) 4 CPU 2.66GHz (2666.78-MHz
686-class CPU)
real memory = 796131328 (759 MB)
top output:
-------------
last pid: 58610; load averages: 0.06, 0.17, 0.13
up 16+02:58:40 16:23:31
83 processes: 4 running, 49 sleeping, 30 waiting
CPU states: 0.0% user, 0.0% nice, 0.2% system,
46.5% interrupt, 53.3% idle
Mem: 7988K Active, 338M Inact, 117M Wired, 85M Buf,
275M Free
Swap: 2048M Total, 2048M Free
PID USERNAME PRI NICE SIZE RES STATE TIME
WCPU CPU COMMAND
11 root 171 52 0K 8K RUN
304.5H 52.54% 52.54% idle
31 root -68 -187 0K 8K RUN
44.1H 25.59% 25.59% irq21: rl0
32 root -68 -187 0K 8K WAIT
34.9H 18.95% 18.95% irq22: rl1
50 root 20 0 0K 8K
syncer 28:01 0.00% 0.00% syncer
35 root -28 -147 0K 8K WAIT
7:50 0.00% 0.00% swi5: clock sio
-------------
I could not guess why i am getting high cpu
utilization by the interrupts.
What could i do in order to reduce the cpu utilization
by the interrupt
requests because due to high interrupts the system
performance is
very poor and almost impractical to use in real high
speed networks.
any suggestions will be highly appreciated,
thanks,
kamal
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