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Date:      Mon, 23 Apr 2012 10:24:41 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        pyunyh@gmail.com
Cc:        Pavel Gorshkov <gorshkov.pavel@gmail.com>, freebsd-stable@freebsd.org
Subject:   Re: msk0: interrupt storm
Message-ID:  <201204231024.42237.jhb@freebsd.org>
In-Reply-To: <20120307204052.GC9436@michelle.cdnetworks.com>
References:  <20120228210329.GA2741@localhost> <201203061036.05227.jhb@freebsd.org> <20120307204052.GC9436@michelle.cdnetworks.com>

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On Wednesday, March 07, 2012 3:40:53 pm YongHyeon PYUN wrote:
> On Tue, Mar 06, 2012 at 10:36:05AM -0500, John Baldwin wrote:
> > On Thursday, March 01, 2012 8:29:55 pm YongHyeon PYUN wrote:
> > > On Wed, Feb 29, 2012 at 01:03:29AM +0400, Pavel Gorshkov wrote:
> > > > My laptop running 9.0-RELEASE/amd64/GENERIC freezes and
> > > > (sometimes) unfreezes intermittently, logging the following:
> > > > 
> > > > Feb 28 23:07:36 lifebook kernel: interrupt storm detected on "irq259:"; 
> > throttling interrupt source
> > > > 
> > > > $ vmstat -i
> > > > ...
> > > > irq259: mskc0                   11669511       3456
> > > > 
> > > > 
> > > > Looks very similar to this:
> > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=164569
> > > > 
> > > > Any suggestions?
> > > 
> > > Try disabling MSI and see whether that makes any difference.
> > 
> > I also get interrupt storms with msk.  They do fix themselves when they 
> > happen, and I've seen it happen with the machine is idle.  This is on my 
> > little netbook where msk had several problems initially that have since been 
> > fixed.
> > 
> > mskc0: <Marvell Yukon 88E8072 Gigabit Ethernet> port 0x2000-0x20ff mem 
> > 0xe0000000-0xe0003fff irq 19 at device 0.0 on pci32
> > msk0: <Marvell Technology Group Ltd. Yukon EX Id 0xb5 Rev 0x02> on mskc0
> > msk0: Ethernet address: 00:24:81:40:e3:ef
> > miibus0: <MII bus> on msk0
> > e1000phy0: <Marvell 88E1149 Gigabit PHY> PHY 0 on miibus0
> > e1000phy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
> > 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, auto, auto-flow
> > 
> > mskc0@pci0:32:0:0:      class=0x020000 card=0x3056103c chip=0x436c11ab 
> > rev=0x10 hdr=0x00
> >     vendor     = 'Marvell Technology Group Ltd.'
> >     device     = '88E8072 PCI-E Gigabit Ethernet Controller'
> >     class      = network
> >     subclass   = ethernet
> > 
> 
> John, can you let me know the value of B0_Y2_SP_ISRC2 register in
> interrupt handler when you see the interrupt storm?

I finally tested this.  I added some KTR traces to dump ISRC2 on each
call to msk_intr() and hacked the interrupt thread code to turn KTR tracing
off when a storm occurred.  The traces look like this:

index  cpu timestamp        trace
------ --- ---------------- ----- 
   148   0  111662766108828 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   147   0  111662765994576 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   146   0  111662765380260 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   145   0  111662765257308 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   144   0  111662765134356 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   143   0  111662765011560 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   142   0  111662764888656 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   141   0  111662764773924 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   140   0  111662764659360 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   139   0  111662764528140 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   138   0  111662764413576 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
   137   0  111662764287852 msk_intr: B0_Y2_SP_ISRC2 = 0x44000000
...

(All traces have the same register value.)  The TSC on this netbook runs
at machdep.tsc_freq: 1596035244

(The timestamps above are TSC values.)

Let me know if you'd like me to log more stuff in the driver.  Thanks!

-- 
John Baldwin



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