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Message-ID: <alpine.DEB.1.00.0803281440460.23558@penti.org> Date: Fri, 28 Mar 2008 15:04:25 +0200 (EET) From: Harald Hannelius <harald@....fi> To: Michael Chan <mchan@...adcom.com> cc: David Miller <davem@...emloft.net>, linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org> Subject: Re: tg3 bad performance, lots of hardware interrupts On Thu, 27 Mar 2008, Michael Chan wrote: > 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. Phew, I thought that running ethtool -t was like doing stop-A-sync on a Sun. It took almost half an hour to run that ethtool -t command; 'mpstat 2' output while running 'ethtool -t eth2': Full log here (2160 lines): http://www.iki.fi/~harald/mpstat.log A few lines from that log here; Linux 2.6.24.4 (mauer) 03/28/2008 10:37:14 AM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 10:37:16 AM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 115.50 10:37:18 AM all 0.00 0.00 1.00 0.00 0.00 0.00 0.00 99.00 123.50 10:37:20 AM all 0.00 0.00 0.75 0.00 0.00 0.00 0.00 99.25 142.79 10:37:23 AM all 0.00 0.00 25.66 0.00 23.77 2.26 0.00 48.30 76.38 10:37:25 AM all 0.00 0.00 17.13 0.00 31.12 21.68 0.00 30.07 75.12 10:37:27 AM all 0.00 0.00 12.17 0.00 25.48 28.90 0.00 33.46 103.00 10:37:29 AM all 0.00 0.00 0.40 0.00 38.15 23.29 0.00 38.15 70.15 10:37:31 AM all 0.00 0.00 0.40 0.00 41.90 23.32 0.00 34.39 71.43 10:37:33 AM all 0.00 0.00 2.83 0.00 29.68 34.98 0.00 32.51 123.38 10:37:35 AM all 0.00 0.00 11.07 0.00 33.21 24.81 0.00 30.92 78.74 ... goes on like this for almost half-an-hour ... 11:04:03 AM all 0.00 0.00 0.00 0.00 34.69 22.86 0.00 42.45 71.50 11:04:05 AM all 0.00 0.00 1.53 0.00 33.72 26.82 0.00 37.93 84.50 11:04:07 AM all 0.00 0.00 0.40 0.00 38.15 22.89 0.00 38.55 74.26 11:04:09 AM all 0.00 0.00 0.00 0.00 38.80 21.60 0.00 39.60 72.64 11:04:11 AM all 0.00 0.00 0.00 0.00 42.17 23.29 0.00 34.54 69.50 11:04:13 AM all 0.00 0.00 3.60 1.44 31.29 33.45 0.00 30.22 111.39 11:04:15 AM all 0.00 0.00 0.00 0.00 0.51 0.76 0.00 98.73 110.50 11:04:17 AM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 119.50 11:04:19 AM all 0.00 0.00 0.25 1.24 0.00 0.00 0.00 98.51 126.87 11:04:21 AM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 106.50 ... command finished ... Sadly I didn't capture the output from ethtool -t, failed anyway. I'm running that test a second time right now, I'll post the output later (when finished). While the 'ethtool -t eth2' is running eth0 (forcedeth) doesn't respond to ping, when going to the console it didn't wake up with a keypress, nor did capslock/numlock react. 'mpstat 2' while running modprobe tg3: Linux 2.6.24.4 (mauer) 03/28/2008 02:47:05 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 02:47:07 PM all 0.00 0.00 0.75 0.00 0.00 0.00 0.00 99.25 138.00 02:47:09 PM all 0.00 0.00 0.25 0.00 0.00 0.00 0.00 99.75 120.00 02:47:11 PM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 132.50 02:47:13 PM all 0.00 0.00 14.19 0.00 17.16 1.65 0.00 67.00 92.08 02:47:15 PM all 0.00 0.00 19.60 0.00 30.40 1.20 0.00 48.80 60.50 02:47:17 PM all 0.56 0.00 4.20 0.00 5.88 0.28 0.00 89.08 127.14 02:47:19 PM all 0.00 0.00 0.75 0.00 0.25 0.00 0.00 99.00 127.00 'mpstat 2' while running ifconfig eth2 up: Linux 2.6.24.4 (mauer) 03/28/2008 02:47:50 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 02:47:52 PM all 0.00 0.00 0.40 0.00 44.95 16.49 0.00 38.16 194.47 02:47:54 PM all 0.00 0.00 0.76 0.00 46.91 16.77 0.00 35.56 205.47 02:47:56 PM all 0.00 0.00 2.06 0.00 15.88 14.12 0.00 67.94 107.96 Hope my overlong lines don't get wrapped... No hints on dmesg on what's going on. -- A: Top Posters! | s/y Charlotta | Q: What is the most annoying thing on mailing lists? | FIN-2674 | http://www.fe83.org/ Finn Express Purjehtijat ry | ============= | Harald H Hannelius | harald (At) iki (dot) fi | GSM +358 50 594 1020 -- 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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