Date: Wed, 26 Dec 2007 02:22:51 -0800 From: Michael DeMan <michael@staff.openaccess.org> To: freebsd-net@freebsd.org, Jordi Espasa Clofent <jordi.espasa@opengea.org> Subject: Re: Maximum NIC interrupts Message-ID: <8EAFDDF1-7A7D-45C4-A25A-50A3999D9438@staff.openaccess.org> In-Reply-To: <47722927.5000106@opengea.org> References: <4770F5BF.40100@opengea.org> <2a41acea0712260040h7ef404eby661d7eea68706209@mail.gmail.com> <47722927.5000106@opengea.org>
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Hi, I think this is a really good question. I'm curious since we use a lot of stripped-down FreeBSD for modest =20 performance routers. We typically enabling our interfaces with POLLING not so much for =20 performance (it seems to be a negligible improvement nowadays) but so =20= that we know that our OSPF/BGP/SSH processes are always responsive. I'd be curious if anybody could get back on this. I've never even =20 considered things from the perspective of how many interrupts a NIC =20 could generate other than that they could always generate too many. - mike On Dec 26, 2007, at 2:12 AM, Jordi Espasa Clofent wrote: > OK, I'll try to explain in another way. > > While I've done network performance test I've monitored the IRQ =20 > rate, and, for example, it's a 7000/8000 interrupts per second in =20 > every NIC (I use 2 NICs in a bridge). The question is > > =BFhow can I know if this irq rate is too high or not? =BFhow can I =20= > know if I'm closer to device limits, or kernel limits? > > I want to say that I'm don't know if 8000 irq per second means a =20 > high IRQ use or a lower user. > > I hope I've explained better at this time. > > --=20 > Thanks, > Jordi Espasa Clofent > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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