Date: Sun, 11 Dec 2005 13:48:05 +0000 From: Brian Candler <B.Candler@pobox.com> To: kamal kc <kamal_ckk@yahoo.com> Cc: freebsd <freebsd-net@freebsd.org> Subject: Re: high interrupts by network interfaces Message-ID: <20051211134805.GB98105@uk.tiscali.com> In-Reply-To: <20051211112650.67553.qmail@web35715.mail.mud.yahoo.com> References: <20051211112650.67553.qmail@web35715.mail.mud.yahoo.com>
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On Sun, Dec 11, 2005 at 03:26:50AM -0800, kamal kc wrote: > 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. Suggestion: start with a standard kernel, without your custom modifications. If unmodified bridging works, and you get the high interrupt level, then you have found a problem with in FreeBSD. If unmodified bridging works, but interrupts are at a normal level, then you have a found a problem with your own code.
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