[Bridge] Lowering CPU utilisation

Leigh Sharpe lsharpe at pacificwireless.com.au
Tue Nov 6 13:51:41 PST 2007

I'm using e1000 cards.
According to oprofile, around 50% of the time is spent in the e1000
Given that my load average is still under 0.5, I suspect I've got plenty
of room for the driver to handle more traffic before I need to worry too


From: Vaidas M [mailto:admin at vdx.lt] 
Sent: Tuesday, 6 November 2007 9:32 PM
To: Leigh Sharpe
Subject: RE: [Bridge] Lowering CPU utilisation

What kind of NIC you are using?

I suggest you to use cards with NAPI featured in driver.


_      _     _    _   _  _ _ __ ___ ____ _____

Vaidas M. 


From: bridge-bounces at lists.linux-foundation.org
[mailto:bridge-bounces at lists.linux-foundation.org] On Behalf Of Leigh
Sent: Thursday, November 01, 2007 12:00 AM
To: bridge at lists.linux-foundation.org
Subject: [Bridge] Lowering CPU utilisation


Hi All, 

 I have a box with 12 bridges on it, each of which has 2 ports.

When the traffic level on the box reaches around 15-20Mbps on each
bridge, my CPU utilisation gets to about 90-95%.

I would like to avoid working the CPU that hard. Is there anything which
can be done to get the CPU utlilisation down a bit? I have plans for an
even bigger bridge, but these results indicate that it may not scale
quite that well.





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