Date: Thu, 08 Apr 2010 17:05:05 -0400 From: Mike Tancsa <mike@sentex.net> To: pyunyh@gmail.com Cc: freebsd-stable@freebsd.org, jfvogel@gmail.com Subject: Re: em driver regression Message-ID: <201004082105.o38L5DCH044187@lava.sentex.ca> In-Reply-To: <20100408205626.GN5734@michelle.cdnetworks.com> References: <201004081313.o38DD4JM041821@lava.sentex.ca> <7.1.0.9.0.20100408091756.10652be0@sentex.net> <201004081446.o38EkU7h042296@lava.sentex.ca> <20100408181741.GI5734@michelle.cdnetworks.com> <201004081831.o38IVR3s043434@lava.sentex.ca> <20100408205626.GN5734@michelle.cdnetworks.com>
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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, mike@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike
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