Date: Thu, 07 Jun 2007 12:19:12 +0200 From: "Julian H. Stacey" <jhs@berklix.org> To: freebsd-current@freebsd.org Cc: Abdullah Ibn Hamad Al-Marri <almarrie@gmail.com> Subject: Re: Why not remove polling(4) from 7.0? Message-ID: <200706071019.l57AJCBS086357@fire.jhs.private> In-Reply-To: <499c70c0706070210v39f7016hbd80e9780902e992@mail.gmail.com> References: <499c70c0706070210v39f7016hbd80e9780902e992@mail.gmail.com>
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"Abdullah Ibn Hamad Al-Marri" wrote:
> Hello Guys,
>
> Almost all cases polling(4) adds additional latency.
> There are some cases that polling(4) helps a little but most cases it wouldn't.
>
> So why not remove it or switch to adaptive polling as em(4) instead of
> resorting to polling?
I don't know the different polling strategies, but would caution
before potentially making it yet More difficult for old laptops.
/boot/loader.conf hw.pcic.irq="0" is needed on 4.11-RELEASE
on a laptop here else no pcmcia ethernet.
I know this isn't mobile@, but as topic raised here: I have 6 laptops:
1 only, new, can run 6.2-RELEASE!
1 (Digital HiNote Ultra2000) stuck on old 5.1+ -current I recall,
4 stuck on 4.11 (pcmcia ether &/or disc access problems)
FreeBSD-5 & 6 wont boot/install for various reasons, mostly pcmcia & disc.
Running current would be overly ambitious till I raised some of
those 4 boxes. Losing polling sounds possibly scarey ?
I append notes in case anyone has additional suggestions/corrections
for me to try (OK, I havent tried all this on all laptops, just most on one):
(by chance a Dell Latitude XPi P133ST - disc now works - pcmcia not seen.)
beastie_disable="yes"
boot_verbose="yes"
verbose_loading="yes"
debug.bootverbose=1
hint.acpi.0.disabled="1" # set to boot with acpi disabled.
Above is set by forth/beastie.4th:bootsafekey
loader.acpi_disabled_by_user=1 #
Above is set by forth/beastie.4th:bootsafekey
hint.apm.0.disabled="1" # found on host=fire with kenv.
hint.apic.0.disabled="1" # set to boot in safe mode
Above set by forth/beastie.4th:bootsafekey
hw.ata.ata_dma=0 # ATA disk DMA mode control
needed by Dell Latitude XPi P133ST says
Ian Freilich <if @ hetzner.co.za>, 07.10.2004
Above referenced by forth/beastie.4th:bootsafekey
hw.ata.atapi_dma=0 # ATAPI device DMA mode control
Above referenced by forth/beastie.4th:bootsafekey
hw.ata.wc=0 # ATA disk write caching
Above referenced by forth/beastie.4th:bootsafekey
hw.eisa_slots=0 #
Above referenced by forth/beastie.4th:bootsafekey
hint.kbdmux.0.disabled=1
Above is referenced by forth/beastie.4th:bootsafekey
hw.pci.enable_io_modes=0 # use if boot hangs after agp
hw.pcic.ignore_pci=1 # ignore pci cardbus bridges
hw.pcic.intr_path="1" # Needed by host=lapa
Normally interrupts for cardbus bridges are routed over the
PCI bus (2). However, some laptops will hang when using
PCI interrupts due to bugs in this code. Those bugs can
be worked around by forcings ISA interrupts (1). Warner
wrote: Libretto-50 and Libretto-70 machines have only ISA
PCMICA bridges
hw.pcic.irq="0" # Needed by host=lapa
Override IRQ configured by system for all pcic devices
hw.pcic.pd6729_intr_path
Determine interrupt path or method for Cirrus
Logic PD6729 and similar I/O space based pcmcia
bridge. Chips on a PCI expansion card need a value
of 2, while chips installed in a laptop need a value
of 1 (which is also the default). This is similar
to hw.pcic.intr_path, but separate so that it can
default to ISA when intr_path defaults to PCI.
hw.pcic.ti12xx_enable_pci_clock
Some TI-12xx parts need to have the PCI clock enabled.
These designs do not provide a clock themselves. Most of
the reference boards have the required oscillator parts,
so the number of machines that needs this to be set is
vanishingly small.
machdep.bios.pci=disable #
machdep.bios.pnp=disable #
machdep.pccard.pcic_irq="0" # PCCARD controller IRQ (0=polled)
machdep.pccard.pcic_irq=11
------
Julian
--
Julian Stacey. Munich Computer Consultant, BSD Unix C Linux. http://berklix.com
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