netdev - Re: Bad sky2 interrupt handling?

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Message-ID: <20090716165741.2142a679@jbarnes-g45>
Date:	Thu, 16 Jul 2009 16:57:41 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Bad sky2 interrupt handling?

On Thu, 16 Jul 2009 16:37:27 -0700
Stephen Hemminger <shemminger@...tta.com> wrote:

> On Thu, 16 Jul 2009 16:25:52 -0700
> Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> 
> > I was debugging what I thought was a graphics driver problem today
> > (some page flipping code I'm working on was only flipping at about
> > 10Hz rather than ~60Hz) but it appears it's actually due to a bad
> > interaction with the Marvell 88E8036 controller on this machine.
> > 
> > MSI fails on this box (haven't looked too much at why yet), so the
> > i915 driver shares an interrupt with USB, firewire, sdhci and the
> > NIC.
> > 
> > Is sky2 the wrong driver to be using here?  Or is there some way of
> > reducing its overhead when (presumably) it doesn't have anything to
> > do?
> 
> No, that is the right driver.  If MSI fails, does the driver still
> think it can use MSI?

No, I think it's falling back correctly... lemme get the log.

...
sky2 driver version 1.23
sky2 0000:01:00.0: PCI INT A -> Link[LNKA] -> GSI 11 (level, low) -> IRQ 11 sky2 0000:01:00.0: setting latency timer to 64 sky2
0000:01:00.0: Yukon-2 FE chip revision 1 sky2 0000:01:00.0: irq 18 for MSI/MSI-X
sky2 0000:01:00.0: No interrupt generated using MSI,
switching to INTx mode.
sky2 eth0: addr 00:a0:d1:bb:88:52
...
sky2 skge: enabling interface
sky2 skge: Link is up at 100 Mbps, full duplex, flow control both

at least it looks like it.

-- 
Jesse Barnes, Intel Open Source Technology Center
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