Attachment 47969 Details for Bug 73429 – kernconf2.diff

[patch] kernconf2.diff

kernconf2.diff (text/x-patch), 2.33 KB, created by Joel Dahl on 2004-11-03 09:46:49 UTC

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Creator: Joel Dahl

Created: 2004-11-03 09:46:49 UTC

Size: 2.33 KB

patch

obsolete

>--- chapter.sgml	Sun Oct 31 09:06:48 2004
>+++ new.chapter.sgml	Wed Nov  3 10:26:04 2004
>@@ -893,19 +893,28 @@
> 
>     <programlisting>options          ADAPTIVE_GIANT    # Giant mutex is adaptive.</programlisting>
> 
>-    <para>This option causes Giant to be included in the set of mutexes
>-      adaptively spun on.</para>
>+    <para>Giant is the name of a mutual exclusion mechanism (a sleep mutex)
>+      that protects a large set of kernel resources.  Today, this is an
>+      unacceptable performance bottleneck which is actively beeing replaced
>+      with locks that protect individual resources.  The
>+      <literal>ADAPTIVE_GIANT</literal> option causes Giant to be included
>+      in the set of mutexes adaptively spun on.  That is, when a thread
>+      wants to lock the Giant mutex, but it is already locked by a thread
>+      on another CPU, the first thread will keep running and wait for the
>+      lock to be released.  Normally, the thread would instead go back to
>+      sleep and wait for its next chance to run.  If you are not sure,
>+      leave this in.</para>
> 
>     <indexterm>
>       <primary>kernel options</primary>
>       <secondary>SMP</secondary>
>     </indexterm>
>-    <programlisting># To make an SMP kernel, the next two are needed
>-options         SMP                # Symmetric MultiProcessor Kernel
>-device          apic               # I/O APIC</programlisting>
>+    <programlisting>device          apic               # I/O APIC</programlisting>
> 
>-    <para>The above are both required for SMP support, and can also be
>-      safely enabled on uniprocessor systems.</para>
>+    <para>The apic device enables the use of I/O APIC for interrupt
>+      delivery.  The apic device can be used in both UP and SMP kernels, but
>+      is required for SMP kernels.  Add <literal>options SMP</literal> to
>+      include support for multiple processors.</para>
> 
>     <programlisting>device          isa</programlisting>
> 
>@@ -1026,6 +1035,7 @@
> device          asr        # DPT SmartRAID V, VI and Adaptec SCSI RAID
> device          ciss       # Compaq Smart RAID 5*
> device          dpt        # DPT Smartcache III, IV - See NOTES for options
>+device          hptmv      # Highpoint RocketRAID 182x
> device          iir        # Intel Integrated RAID
> device          ips        # IBM (Adaptec) ServeRAID
> device          mly        # Mylex AcceleRAID/eXtremeRAID

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