Date: Thu, 31 Jan 2013 08:45:14 +0000 From: "Eggert, Lars" <lars@netapp.com> To: "mjl@luckie.org.nz" <mjl@luckie.org.nz> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: high cpu usage on natd / dhcpd Message-ID: <D4D47BCFFE5A004F95D707546AC0D7E91F6B79D2@SACEXCMBX01-PRD.hq.netapp.com>
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Hi, > I have a small system running FreeBSD 8.2 that does NAT using ipfw and > natd to systems attached to two interfaces: em0 and wlan0. I have a > dhcpd daemon issuing leases on those interfaces. The system has an em1 > interface plugged into a cable modem where it obtains a DHCP lease from > an ISP. > > For some reason, when traffic from the Internet terminates on the system > itself (I scp a file from the computer) the natd and dhcpd processes > consume significant CPU, and the throughput is less than I expect. > Traffic that passes through to a computer behind the NAT flows without > causing the natd or dhcpd processes to measurably consume CPU. I see exactly the same issue on -STABLE. Have you been able to figure out the cause? Thanks, Lars
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