From mboxrd@z Thu Jan 1 00:00:00 1970
From: Pat LaVarre
Subject: Re: zeroes read back more often than appended
Date: 08 Oct 2003 11:02:20 -0600
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Wed, 8 Oct 2003 13:02:32 -0400
To: linux-fsdevel@vger.kernel.org, linux_udf@hpesjro.fc.hp.com
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> > ... 2.6.0-test6 ...
> > CPU0: Intel(R) Pentium(R) 4 CPU 2.40GHz stepping 09
> > CPU1: Intel(R) Pentium(R) 4 CPU 2.40GHz stepping 09
> > ... read more zeroes than appended ...
>
> whats going on in 2.6.0-test6-smp ...
I will confirm or deny that turning off my second cpu keeps zeroes from
reading back after fopen, repeat fwrite, fclose file ...
... if/when I learn how to turn off my second cpu.
Meanwhile, til I know better, I will blame `make defconfig` for having
turned on my second cpu. Indeed immediately from that beginning, I see
`grep -i smp .config` followed by `make xconfig` suggests I try the
one-click "Processor type and features" "Symmetric multi-processing
support" = No patch:
-CONFIG_LOG_BUF_SHIFT=15
-CONFIG_NR_CPUS=8
-CONFIG_SMP=y
-CONFIG_X86_EXTRA_IRQS=y
-CONFIG_X86_FIND_SMP_CONFIG=y
-CONFIG_X86_HT=y
-CONFIG_X86_IO_APIC=y
-CONFIG_X86_LOCAL_APIC=y
-CONFIG_X86_MCE_P4THERMAL=y
-CONFIG_X86_MPPARSE=y
-CONFIG_X86_SMP=y
-CONFIG_X86_TRAMPOLINE=y
+# CONFIG_FTAPE is not set
+# CONFIG_SMP is not set
+# CONFIG_X86_UP_APIC is not set
+CONFIG_BROKEN_ON_SMP=y
+CONFIG_LOG_BUF_SHIFT=14
I will try this patch and report back.
Pat LaVarre