linux-kernel - Re: various laptop nagles - any suggestions? (note: 2.6.19-rc2-mm1 but applies to multiple kernels)

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Message-Id: <20061020182527.a07666a4.akpm@osdl.org>
Date:	Fri, 20 Oct 2006 18:25:27 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	tglx@...utronix.de, teunis <teunis@...tersgift.com>,
	linux-kernel@...r.kernel.org, Dmitry Torokhov <dtor@...l.ru>,
	john stultz <johnstul@...ibm.com>
Subject: Re: various laptop nagles - any suggestions?   (note:
 2.6.19-rc2-mm1 but applies to multiple kernels)

On Fri, 20 Oct 2006 22:56:51 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...l.org> wrote:
> 
> > Oh.  I thought the problem was that the timer stops when the CPU is 
> > idle. Maybe I misremembered.  I'll try `idle=poll'.
> 
> hm, wouldnt in that case the box not boot at all? But yeah, idle=poll 
> would be nice.

idle=poll fixes it.  The fan gets a bit noisy though ;)

Perhaps a suitable test would be to set up a PIT interrupt, do a hlt, see
if the APIC timer counter has increased appropriately.




I got this:

[   43.709238] TSC appears to be running slowly. Marking it as unstable

How come?  It also happens with HIGH_RES_TIMERS=n and NO_HZ=n.  It only
seems to happen when idle=poll is given.



> could you also boot with apic=verbose and send us the full bootlog?
> 

http://userweb.kernel.org/~akpm/apic.txt

I gave up on waiting for it to complete initscripts.


processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Pentium(R) M processor 2.00GHz
stepping        : 8
cpu MHz         : 800.000
cache size      : 2048 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx est tm2
bogomips        : 3994.15
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