linux-kernel - Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

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Date:	Thu, 18 Sep 2008 12:00:50 -0700
From:	"Steven Noonan" <steven@...inklabs.net>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...e.hu>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"ath9k-devel@...ts.ath9k.org" <ath9k-devel@...ts.ath9k.org>
Subject: Re: [ath9k-devel] ath9k: massive unexplained latency in 2.6.27 (rc5, rc6, probably others)

On Thu, Sep 18, 2008 at 11:42 AM, Luis R. Rodriguez
<lrodriguez@...eros.com> wrote:
> On Thu, Sep 18, 2008 at 11:34 AM, Luis R. Rodriguez
>> irqpoll is a monster of evil and that should make your system crawl to
>> its knees. I would advise instead we work with you fixing the the
>> missed interrupts issue upon rmmod.
>
> Also, please provide the output of
>
> cat /proc/interrupts

Note that the problem necessitating use of irqpoll in the first place
seems to only happen under certain conditions. I am unsure what these
conditions are. Before 'ath9k: connectivity is lost after Group
rekeying is done', I had used rmmod/modprobe as my solution to the
issue, which triggered the IRQ issue.

alcarin steven # cat /proc/interrupts
           CPU0       CPU1
0x0:      63227          0   IO-APIC-edge      hpet
0x8:          1          0   IO-APIC-edge      rtc0
0x9:      13080          0   IO-APIC-fasteoi   acpi
0xe:       8195          0   IO-APIC-edge      ide0
0xf:          0          0   IO-APIC-edge      ide1
0x10:         36          0   IO-APIC-fasteoi   uhci_hcd:usb5
0x11:      10645          0   IO-APIC-fasteoi   ath
0x12:         42          0   IO-APIC-fasteoi   uhci_hcd:usb4
0x17:        919          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2
0x13:      32885          0   IO-APIC-fasteoi   uhci_hcd:usb3,
ata_piix, ohci1394
0x200100:          1          0   PCI-MSI-edge      eth0
0x16:        223          0   IO-APIC-fasteoi   HDA Intel
NMI:          0          0   Non-maskable interrupts
LOC:      78087      95718   Local timer interrupts
RES:      11576      16384   Rescheduling interrupts
CAL:       6862       8889   Function call interrupts
TLB:         54         41   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          0


>
> and also please do not cross post to all these lists, just use
> linux-wireless or ath9k.
>

Sorry, but in the past I've posted to linux-wireless, ath9k-devel, and
all the maintainers of ath9k and didn't get a single response (except
a 'me too' from a fellow ath9k user). I didn't just want to hear
crickets this time.

- Steven
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