At 04:56 PM 4/8/2010, Pyun YongHyeon wrote:
On Thu, Apr 08, 2010 at 02:31:18PM -0400, Mike Tancsa wrote:
> At 02:17 PM 4/8/2010, Pyun YongHyeon wrote:
>
> >Try this patch. It should fix the issue. It seems Jack forgot to
> >strip CRC bytes as old em(4) didn't strip it, probably to
> >workaround silicon bug of old em(4) controllers.
>
> Thanks! The attached patch does indeed fix the dhclient issue.
>
>
> >It seems there are also TX issues here. The system load is too high
> >and sometimes system is not responsive while TX is in progress.
> >Because I initiated TCP bulk transfers, TSO should reduce CPU load
> >a lot but it didn't so I guess it could also be related watchdog
> >timeouts you've seen. I'll see what can be done.
>
> Thanks for looking into that as well!!
>
> ---Mike
>
Mike,
Here is patch I'm working on. This patch fixes high system load and
system is very responsive as before. But it seems there is still
some TX issue here. Bulk UDP performance is very poor(< 700Mbps)
and I have no idea what caused this at this moment.
BTW, I have trouble to reproduce watchdog timeouts. I'm not sure
whether latest fix from Jack cured it. By chance does your
controller support multi TX/RX queues? You can check whether em(4)
uses multi-queues with "vmstat -i". If em(4) use multi-queue you
may have multiple irq output for em0.
Hi,
I will give it a try later tonight! This one does not seem to.
0(ich10)# vmstat -i
interrupt total rate
irq16: uhci0+ 30 0
irq18: ehci0 uhci5 158419 17
irq19: fwohci0++ 86 0
irq21: uhci1 17 0
irq23: uhci3 ehci1 2 0
cpu0: timer 18570305 1994
irq256: igb0 80 0
irq257: igb0 255 0
irq258: igb0 66 0
irq259: igb0 32 0
irq260: igb0 2 0
irq261: igb1 2679 0
irq262: igb1 998 0
irq263: igb1 2468 0
irq264: igb1 6361 0
irq265: igb1 2 0
irq266: em0 33910 3
irq267: ahci1 15317 1
cpu1: timer 18557074 1993
cpu3: timer 18557168 1993
cpu2: timer 18557108 1993
Total 74462379 7998
0(ich10)#
--------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, m...@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike
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