Re: 2.6.20-rc7: known regressions (v2) (part 1)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Adam Kropelin wrote:
Auke Kok wrote:
Adam Kropelin wrote:
I've never had this device work 100% with MSI on any kernel version
I've tested so far. But I'm not the original reporter of the
problem, and I believe for him it was a true regression where a
previous kernel wored correctly.
maybe I've been unclear, but here's how e1000 detects link changes:

1) by checking every 2 seconds in the watchdog by reading PHY
registers

That would explain why I see link status changes but 0 interrupt count in /proc/interrupts. However, on >= 2.6.19 the link state never changes. Ever. It's always down. On <= 2.6.18 the link state does change but with 0 interupt count.

2) by receiving an interrupt from the NIC with the LSI bit
in the interrupt control register

if the link is down to start with, the watchdog will obviously spot a
'link up' change since it doesn't use any interrupts.

This does not seem to work on 2.6.19+. Unless the watchdog interval is tens of minutes. I've waited at least 5 minutes and link never went up.

that's explained by a driver change that did that. Since at initialization we're basically waiting for a link change to tell the stack that we're up, we decided to change the order to have the hardware fire an LSI interrupt to trigger a watchdog run. So no interrupts would immediately explain why the watchdog never runs. That's nothing to worry about for this problem, as soon as interrupts are seen in /proc/interrupts this all starts working for e1000.

Cheers,

Auke
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux