Date: Wed, 15 Nov 2000 09:39:38 +0200 From: Ruslan Ermilov <ru@sunbay.com> To: sanjeev singh <remraf@hobbiton.org> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: natd limiting download speed? Message-ID: <20001115093938.A36400@sunbay.com> In-Reply-To: <Pine.BSO.4.21.0011141717490.22743-100000@thorin>; from remraf@hobbiton.org on Tue, Nov 14, 2000 at 05:20:01PM -0600 References: <Pine.BSO.4.21.0011141717490.22743-100000@thorin>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, Nov 14, 2000 at 05:20:01PM -0600, sanjeev singh wrote: > > Hello, > > I recently set up an ipfw+natd machine (FreeBSD 3.5.1R) for sharing my = > cable connection. Unfortunately, natd appears to be limiting the = > maximum bandwidth available! > This is because natd(8) is a userspace solution, and every packet is copied twice, first from kernel space to user space, and then back from user space to kernel space. > Using netperf, I have established that I can get up to just under 4mbps = > with natd enabled, and 4.3mbps with it disabled. This might not look = > like a big deal, except that in the former case, my CPU is fully loaded = > whereas in the latter it's only at 50%! > > Also, when testing high speed downloads (from netscape.com), I get the = > following results: > Download speed: ~350+KB/s > CPU States: 50-60% system, ~35% interrupt and <10% idle > natd takes up 80% of WCPU and CPU > > My firewall machine is a 486/66 (32MB Ram) with an NE2K and a Dec DE = > 201. Are these results in the ballpark or could I have configured = > something wrong? > > If these results are in the ballpark, what can I do to improve the = > situation (short of upgrading my firewall machine)? Is there a more = > CPU-efficient version of natd available? Should I try ipfilter/ipnat? > You decide :-) -- Ruslan Ermilov Oracle Developer/DBA, ru@sunbay.com Sunbay Software AG, ru@FreeBSD.org FreeBSD committer, +380.652.512.251 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20001115093938.A36400>