Hi!
> > Yeah, of course you need to ask e1000e if it generated the
> > interrupt. That part works. The part that actually generates the
> > interrupt does not. Take a look at original mail...
> >
> > packet comes
> > e1000e sets E1000_ICR_INT_ASSERTED bit
> > e1000e tries to generate an interrupt and fails
> > 50msec passes
>
> ^^ thats the ASPM timeout length.
>
> > AHCI generates interrupt
> > all the handlers are called
> > AHCI processes its interrupt, handles disk read
> > e1000_intr notices E1000_ICR_INT_ASSERTED bit, delivers the packet.
> >
> > Network still works, only slowly. Ping goes lower when I use the
> > disk. That matches what I see.
> >
> > Do you have other explanation?
>
> Regardless of what others are saying I believe you have an issue with
> ASPM being enabled. All the discussion about shared interrupts, is
> just a distraction. This issue would still occur (and just be worse)
> without a shared interrupt.
Agreed.
> You already mentioned that a kernel hack to disable ASPM fixes it, but
> you can just boot with different options to turn off ASPM.
>
> pcie_aspm=off
Are you sure? AFAICT linux will not turn off aspm if ACPI says
so.. hence the hack.
# From: Robert Hancock <hancock...@gmail.com>
# To: Pavel Machek <pa...@ucw.cz>
# CC: Greg KH <g...@kroah.com>, kernel list
# <linux-ker...@vger.kernel.org>,
# joe.lawre...@stratus.com, myron.st...@redhat.com,
# bhelg...@google.com
# Subject: Re: /sys/module/pcie_aspm/parameters/policy not writable?
# ...
# > pavel@amd:~$ dmesg | grep -i aspm
# > ACPI FADT declares the system doesn't support PCIe ASPM, so disable
# it
#
# IIRC, this message is somewhat misleading. When that FADT flag is set
# by the BIOS, the kernel doesn't so much disable ASPM as disable the
# kernel's control over ASPM. I believe this was to match Windows
# behavior.
It looks like ASPM needs to be off, but BIOS enables ASPM and tells
kernel it is not supported... and that means that kernel will not
disable it :-(.
I guess there's no way to do ASPM disable for single device from the
driver?
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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