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Message-ID: <1206666100.5368.6.camel@dell> Date: Thu, 27 Mar 2008 17:01:38 -0800 From: "Michael Chan" <mchan@...adcom.com> To: "David Miller" <davem@...emloft.net> cc: harald@....fi, linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org> Subject: Re: tg3 bad performance, lots of hardware interrupts On Thu, 2008-03-27 at 14:49 -0700, David Miller wrote: > From: Harald Hannelius <harald@....fi> > Date: Thu, 27 Mar 2008 15:53:56 +0200 (EET) > > > I experience a lot of hardware interrupts with a BCM5751 PCI-express NIC > > (tg3). modprobe tg3, ifconfig ethX up and friends makes the system > > unresponsive. Just having the interface up makes the system sluggish. > > I just tested a similar NIC using the same kernel and driver, but I did not notice anything unusual. netperf gave me 941Mbps. > > Onboard forcedeth works fine (with the same cable). > > > > iperf gives me just 2Mbps on a 1Gbps ethernet. Load average near 1.0. top > > reports 40-50%hi (hardware interrupts) when generating traffic over that > > interface. Can you look at /proc/interrupts to see roughly how many are reported per second when link is down, link is up with no traffic, and with traffic? Finally, you can also try ethtool -t eth0 to see if it passes a simple self test. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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