Attachment 47968 Details for Bug 73429 – kernconf.diff

[patch] kernconf.diff

kernconf.diff (text/plain), 2.19 KB, created by Joel Dahl on 2004-11-02 18:40:29 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Joel Dahl

Created: 2004-11-02 18:40:29 UTC

Size: 2.19 KB

patch

obsolete

>--- chapter.sgml	Sun Oct 31 09:06:48 2004
>+++ new.chapter.sgml	Tue Nov  2 19:04:34 2004
>@@ -893,19 +893,26 @@
> 
>     <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 ADAPTIVE_GIANT
>+      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.</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.</para>
> 
>     <programlisting>device          isa</programlisting>
> 
>@@ -1026,6 +1033,7 @@
> 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

Actions: View | Diff

Attachments on bug 73429: 47968 | 47969 | 47970