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SubjectRe: 2.6.7-bk way too fast
From
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On Mon, 2004-06-21 at 01:48 -0700, Andrew Morton wrote:
> Jeff Garzik <jgarzik@pobox.com> wrote:
> >
> > Something is definitely screwy with the latest -bk.
>
> Would you believe that there is a totally separate bug in the latest -mm
> which has exactly the same symptoms?

Applying Andrew's two following patches solved my problems with time
skewing.

Thanks!
From linux-kernel-owner@vger.kernel.org Mon Jun 21 11:01:42 2004
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Date: Mon, 21 Jun 2004 01:48:37 -0700
From: Andrew Morton <akpm@osdl.org>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: 2.6.7-bk way too fast
Message-Id: <20040621014837.6b52fa2e.akpm@osdl.org>
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Jeff Garzik <jgarzik@pobox.com> wrote:
>
> Something is definitely screwy with the latest -bk.

Would you believe that there is a totally separate bug in the latest -mm
which has exactly the same symptoms?

mark_offset_tsc() does

if (lost && abs(delay - delay_at_last_interrupt) > (900000/HZ))
jiffies_64++;
which is doing abs(unsigned long).

Which works OK if abs() in a function, but I made it a macro.

This fixes it up.


diff -puN include/linux/kernel.h~abs-fix-fix include/linux/kernel.h
--- 25/include/linux/kernel.h~abs-fix-fix 2004-06-21 01:42:24.283873616 -0700
+++ 25-akpm/include/linux/kernel.h 2004-06-21 01:43:08.150204920 -0700
@@ -55,7 +55,12 @@ void __might_sleep(char *file, int line)
#endif

#define abs(x) ({ \
- typeof(x) __x = (x); \
+ int __x = (x); \
+ (__x < 0) ? -__x : __x; \
+ })
+
+#define labs(x) ({ \
+ long __x = (x); \
(__x < 0) ? -__x : __x; \
})

_
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From linux-kernel-owner@vger.kernel.org Mon Jun 21 10:00:43 2004
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Date: Mon, 21 Jun 2004 00:16:12 -0700
From: Andrew Morton <akpm@osdl.org>
To: lkml@lpbproduction.scom
Cc: lkml@lpbproductions.com, cs@tequila.co.jp, torvalds@osdl.org, norberto+linux-kernel@bensa.ath.cx, linux-kernel@vger.kernel.org, jgarzik@pobox.com
Subject: Re: 2.6.7-bk way too fast
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"Matt H." <lkml@lpbproductions.com> wrote:
>
> I can confirm simular behavior here. I loaded 2.6.7-mm1 tonite and tried
> Andrew's patch ( which didn't work ) and then Linus's ( which also didn't
> work ).
>

hm. This worked for me. Could you double-check?


diff -puN arch/i386/kernel/mpparse.c~double-clock-speed-fix arch/i386/kernel/mpparse.c
--- 25/arch/i386/kernel/mpparse.c~double-clock-speed-fix 2004-06-20 23:28:16.655299120 -0700
+++ 25-akpm/arch/i386/kernel/mpparse.c 2004-06-20 23:28:20.468719392 -0700
@@ -1017,7 +1017,6 @@ void __init mp_config_acpi_legacy_irqs (

for (idx = 0; idx < mp_irq_entries; idx++)
if (mp_irqs[idx].mpc_srcbus == MP_ISA_BUS &&
- (mp_irqs[idx].mpc_dstapic == ioapic) &&
(mp_irqs[idx].mpc_srcbusirq == i ||
mp_irqs[idx].mpc_dstirq == i))
break;
diff -puN arch/x86_64/kernel/mpparse.c~double-clock-speed-fix arch/x86_64/kernel/mpparse.c
--- 25/arch/x86_64/kernel/mpparse.c~double-clock-speed-fix 2004-06-20 23:28:16.672296536 -0700
+++ 25-akpm/arch/x86_64/kernel/mpparse.c 2004-06-20 23:28:20.469719240 -0700
@@ -861,7 +861,6 @@ void __init mp_config_acpi_legacy_irqs (

for (idx = 0; idx < mp_irq_entries; idx++)
if (mp_irqs[idx].mpc_srcbus == MP_ISA_BUS &&
- (mp_irqs[idx].mpc_dstapic == ioapic) &&
(mp_irqs[idx].mpc_srcbusirq == i ||
mp_irqs[idx].mpc_dstirq == i))
break;
_
-
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